Flags can be used to. Then, you can use ob_flush and flush to keep flushing the output. and of course the browser will stop buffering. ini config file and looking for the output buffering configuration setting. Description ¶. The name and value will be added to URLs (as GET parameter) and forms (as hidden input fields) the same way as the session ID when transparent URL rewriting is enabled with session. php'; ob_start(); // start output. PHP Collective Join the discussion. ini configurations. Problem with ob_start function in php. ob_clean (): bool. 1. You can call ob_start () more than once in your script. Use the second method if you want to compress. Is ob_start necessary when the output_buffering is turned on in the php. 0. The proper solution to the "Headers already sent" problem is described in a previous thread. For what you are trying to do, there is no need to use ob_start and ob_flush. By default ( limit = 0) it prints all. Before this callback is invoked PHP will invoke the open callback. ob_start (); session_start (); if. Learn how to use the ob_start () function in PHP to start output buffering and modify your output before sending it to the client. when this sample web page loads, it checks cached file from /cache folder. See the syntax, usage, and examples of the. php`, which is a page that we can submit links for the `admin` to look at. These will either be a built-in save handler provided by default or by PHP extensions (such as. For example: ob_start (); echo "hello"; echo " cyber "; echo "world"; ob_flush (); Instead of doing 3 separate echo, this will hold “hello cyber. 1. Perhaps you can move that part out of the conditional or try rewriting it to where you write the data to the object and then call renderOutput() and this method would have your ob calls in the proper order. now what i want here is to remove the newlines from the stored output of the ob_get_clean(). But keep in mind that output buffering is influenced by many other factors. txt"): global print global output_buffer print = partial (print_orig,. ob_start を理解するためにはまず PHP (PHP: Hypertext Preprocessor) の特徴を知っておく必要があります。 PHP は今では汎用言語として利用されていますが、元々はただの HTML 用のテンプレートツールであり、今でも HTML に埋め込むような構文を特徴としています。 I'm generating a ton of XML that is to be passed to an API as a post variable when a user click on a form button. You can find more details at php. However, like I mentioned, if the webserver is. 이는 사실상 모든 출력을 사용자 브라우저에 보냅니다. in same file where you set header. qualityBasic usage getting content between buffers and clearing, Nested output buffers, Running output buffer before any content, Processing the buffer via a callback, Using Output buffer to store contents in a file, useful for reports, invoices etc, Stream output to client, Capturing the output buffer to re-use later, Typical usage and reasons for using ob_startI have PHP (CGI) and Apache. –We will also initialize a buffer ob_start method and then output an HTML block which will be automatically buffered; we will then get the data from the buffer with the ob_get_contents method and then print it. enclosurephp; gd; ob-start; or ask your own question. This tells PHP to store any output generated by your script in a buffer instead of sending it to the browser. ob_clean — Clean (erase) the output buffer. php). flush ()는 웹 서버나 클라이언트 브라우저의 버퍼링 방식에는 영향을 주지 않습니다. I found ob_start() and ob_get_clean() in php manual to achieve this. This function will send the contents of the output buffer (if any). php') into a pdf is:Remember: You have to set it in every script that uses the session variables BEFORE "session_start()" or php won't find them. tags. The problem is that sometimes I need the contents of the PHP file 20 - 30 times in 1 call. 2. About;. First, call ob_start() at the beginning of your script to turn on output buffering. 3. PHP ob_start() function works by catching all output to buffer and then implicitly output this buffer on script end. This function will turn output buffering on and begin capturing all output sent by the script. net:The ob_start function may change the working directory of the PHP process when it invokes the user-defined callback. 1. Description ¶. Code may be surrounded in a try block, to facilitate the catching of potential exceptions. this is how I am inlcuding the html template in my shortcode function. The ob_start () function creates an output buffer. So the echo output will be buffered. ob_get_clean (): string|false. Advantages of output buffering for Web developers. Pengertian singkatnya, ob_start adalah fungsi yang digunakan untuk mengaktifkan penyimpanan output pada browser terhadap halaman tertentu. I will verify if there is any . This function does not destroy the output buffer like ob_end_clean () does. With output buffering enabled they are stored inside a buffer in PHP, so that it can be retrieved. The ob_get_length () function returns the length of the topmost output buffer's contents in bytes. Ob _ start function is used to create an output buffer in PHP, as we are already aware that PHP is an interpreted language, i. Delete an output buffer without sending its contents to the browser: <?php. flush ()는 웹 서버나 클라이언트 브라우저의 버퍼링 방식에는 영향을 주지 않습니다. Gets the current buffer contents and delete current output buffer. For text-logfile/debugging needs, I want all , , multiple spaces and so on to be cleared. Courses. ";PHP segfaults when output buffering and sessions are enabled and a script is terminated using exit() or die() before flushing or cleaning the contents of the output buffer. 47. php buffer doesn't stop after ob_end_clean. It's useful in cases where you may need to filter some output, or you're using a PHP method (such as var_dump) that writes output. You may execute ob_end_clean() to discard (clean) buffer. Ob _ start function is used to create an output buffer in PHP, as we are already aware that PHP is an interpreted language, i. // Start output buffer. Redirect. One of PHP_OUTPUT_HANDLER_START (0), PHP_OUTPUT_HANDLER_CONT (1) or PHP_OUTPUT_HANDLER_END (2) name: Name of active output handler or ' default output handler' if none is set: del: Erase-flag as set by ob_start() If called with full_status = true an array with one element for each active output buffer level is returned. . Using ob_start ('ob_gzhandler') however will only compress that particular buffer / page and will not affect anything else served by PHP. 3. can please elaborate… how to kill. Probably you are using a buffering function in output buffering callback which isn't possible as mentioned in php ob_start output_callback documentation. This function will turn output buffering on. Stack Overflow Public questions & answers; Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Talent Build your employer brand Definition and Usage. . ob_start (); echo "This output will not be sent to the browser"; ob_end_clean (); echo "This output will be sent to the browser"; ?>. It compresses the contents of the output buffer using a compression algorithm that is supported by the browser and returns the compressed content. For cPanel setting => Sofware/Services => Optimize Website < here choose option what you want >. Apache) change the working directory of a. Turning on output buffering alone decreases the amount of time it takes to download and render our HTML because it's not being sent to the browser in pieces as. 5. Take a look at very simple example for PHP 5. php from server and the code worked well with all other php files. 0. Share. x. In this page, we start a new PHP session and set. 自前バッファ. 그러므로 출력 버퍼를 비우려면 ob_flush. The output may be caught by another output buffer or, if there are no other output buffers, sent directly to the browser. i have reviewed php manual about the ob_start() ob_end_clean() ob_end_flush(). Also, you can use the header() function with ob_start() and ob_end_flush(), like this: ob_start ( callable $callback = null, int $chunk_size = 0, int $flags = PHP_OUTPUT_HANDLER_STDFLAGS ): bool. Essentially, an output buffer in PHP catches anything that would have been output to the browser (excluding headers). gzfile — Read entire gz-file into an array. 次に、 ob_get_contents メソッドを使用してバッファからデータを取得し、それを出力します。. ob_start () opens a buffer in which all output is stored. PHP codes within ob_start are not executed in this way, you should work with an evil function: eval() Share. Given an array associating expressions with callbacks, returns a string where all matches of each expression are replaced with the substring returned by the callback. Use of ob_start() and ob_get_clean() 4. In your script you're checking if you posted data to a value called login from a form. ob_gzhandler detects whether the browser supports any compression method internally. 3. PHP script works on localhost, but doesn't works on hosting. It makes use of the PHP output buffering control to capture things that are not inside PHP code blocks. function print_gzipped_output() {. 3. PHP Collective Join the discussion. So, it works, because you either send the output directly (php's default mode of operation), or you buffer the ouput and send that output "indirectly" via the response object (or by just outputting the return value of ob_get_clean). php Sleeper started at 01:22:02 Parent waiting at 01:22:02 Sleeper done at 01:22:05 Parent done at 01:22:05 However, forking does not inherently allow any inter-process communication, so you'd have to find some other way to inform the parent that the child has reached the specific line, like you asked in the question. ob_end_clean modifies variables as well. Cách dùng ob start , ob flush (), flush () Trong PHP vốn đã chạy nhanh nay còn có thêm cơ chế cache làm cho ngôn ngữ PHP ngày càng hoàn hảo. The key difference is *_clean () discards changes and *_flush () outputs to the browser. Gets the current buffer contents and delete current output buffer. If they are it's not the plugins that are causing it. While output buffering is active no output is sent from the script (other than headers), instead the output is stored in an internal buffer. I also shell_exec() shell scripts which use PHP CLI. How to pass a callback function with parameters for ob_start in PHP? Hot Network Questions Creating buffer for MultiPolygon that covers all its surroundings in QGIS Should I send a PDF or Google Drive link to professors? Build a culture of Accountability Novel: Hidden (floating?) island with aptitude tests and sterilization after multiple. The redirect upon successful completion in your post method form processing code should be to the exact same URL of the current page, to cause a get request for that page. A GdImage object, returned by one of the image creation functions, such as imagecreatetruecolor(). Definition and Usage. 9. For some reason the rest of the code of the page continues to execute after the header () method redirect. use_trans_sid. Using ob_start certainly will affect the load times of your pages -- not "the performance of your PHP script", which is IMHO a totally misleading expression. Apr 6, 2020 at 16:59. For example, the following code won't work: Hello! <?php header ("Location: somepage. Next thing is to begin with ob_start(); Then you need ob_flush(); flush(); before any echo or print. Like in the given example, <p>Hello world</p> is written outside the PHP code block, which is supposed to be output to the client immediately. g. php for errors writing a test. The output buffer must be started by ob_start () with PHP_OUTPUT_HANDLER_CLEANABLE and PHP_OUTPUT_HANDLER_REMOVABLE flags. – shudder. When session_start() is called or when a session auto starts, PHP will call the open and read session save handlers. Take a look at very simple example for PHP 5. While output buffering is active no output is sent from the script (other than headers), instead the output is stored in an internal buffer. Esto se utiliza comúnmente para que las páginas puedan enviar cabeceras "después" de haber "enviado" algún contenido (es decir. 0. While output buffering is active no output is sent from the script (other than headers), instead the output is stored in an internal buffer. As a PHP developer, you may need to get the contents of the output buffer. If callback returns false original input is sent to the browser. 14. Output Buffering is thinking in the right direction, you start output buffering with ob_start() just like you would with sessions (session_start) somewhere in the top of your script, before any output is sent. Flags can be used to permit or restrict what the buffer is able to do. ob_start not executing callback. I get binary garbage. Using output buffering ( ob_start () / ob_get_contents ()) is a valid way of addressing the problem however you need to move the code. ob_start says: Output buffers are stackable, that is, you may call ob_start() while another ob_start() is active. Cách dùng ob start , ob flush (), flush () Trong PHP vốn đã chạy nhanh nay còn có thêm cơ chế cache làm cho ngôn ngữ PHP ngày càng hoàn hảo. 3. I think you meant to use ob_end_flush instead of ob_end_clean, which sends the output buffer to the client instead of just ending buffering. If you want to further process the buffer's contents you have to call ob_get_contents () before ob_end_flush () as the buffer contents are discarded after ob_end_flush () is called. And something like this at the end of your page: <?php ob_end_flush (); ?>. phpThe ob_get_contents () function has different return behaivor in PHP 5. Gets the current buffer contents and delete current output buffer. Parameters. ob_start ( callable $callback = null, int $chunk_size = 0, int $flags = PHP_OUTPUT_HANDLER_STDFLAGS ): bool. You can then copy the contents of the internal buffer to a string and discard the buffer contents. There is NO way you can send a header after you send an output to the browser,Thats the Concept of headers. 5. satishinnovstudio July 1, 2022, 8:37am 5. With the help of this. Which however is less reliable for multiple reasons: Even if <?php ob_start(); ?> starts the first script, whitespace or a BOM might get shuffled before, rendering it ineffective. The output_callback parameter may be bypassed by passing a NULL value. Tôi nhắc đến cơ chế cache vì các hàm ob_start(), ob_get_contents(), ob_clean(), ob_end_flush() sẽ hỗ trợ chúng ta trong quá trình thực hiện cơ chế này. To change this value you can either set it in php. 0. ob_end_clean(), ob_end_flush(), ob_clean(), ob_flush() and ob_start() may not be called from a callback function. Biasanya di database MySQL programmer suka menggunakan autoincrement untuk primary key-nya, namun masalahnya akan muncul saat syncronisasi data dari beberapa database backup,. php ob_start with function that uses die? function a () { die ( 'some text' ) } ob_start (); a (); $return = ob_get_clean (); echo 'result:' var_dump ( $return ); and it doesn't work. 5. Instead of using strip_tags() or any clever trick, I just worked my way backwards from everything that the original function did. php it checks if a session has been created in-order to block hackers to enter member area and sends them back to the login page. it will work as you would use ob_start with no. If you want to further process the buffer's contents you have to call ob_get_contents () before ob_flush () as the buffer contents are discarded after ob_flush () is called. 5. ob_end_flush (); Note: don't forget the "speed" depends on how quick the content is actually generated and not on the speed the data is sent to the client. x. is not included when determining the maximum time that the script. ob_get_length — Return the length of the output buffer; ob_get_level — Anzahl der aktiven Ausgabepuffer; ob_get_status — Get status of output buffers; ob_gzhandler — ob_start callback function to gzip output buffer; ob_implicit_flush — Schaltet die implizite Ausgabe ein bzw. PHP ob_start () Function. display members' bar or what) because they will be cached as well. This function should be used in place of exec() or system() when the output from the Unix command is binary data which needs to be passed directly back to the browser. 2. The callback parameter may be bypassed by passing a null value. Alijvhr. Using the browser. Then simply echo out the results, as needed, in between the HTML code. Try using output buffer like this : ob_start (); // your includes echo ob_get_clean (); Use this in all of your includes, and you will not get any errors. First, since PHP is generally *nix-based, it makes sense that the line endings are always instead of \r . This function does not destroy the output buffer like ob_end_clean () does. JavaScript may be here to stay, but PHP isn’t going anywhere! The Functions. ob_start is especially handy when you have redirections on your page. php redirect using ob_start() and ob_end_flush() php functions. It can also be used to hide any code. W3Schools offers free online tutorials, references and exercises in all the major languages of the web. Use the ob_start() Function With a Callback to Minify HTML Output of the PHP Page. x and PHP 5. gzgetss — Get line from gz-file pointer and strip HTML tags. bool ob_start () Parameters : The function can accept a bunch of optional parameters as follows: Callback function: This is an optional parameter that expects a function that takes the contents of the output buffer and returns a string that is to be sent to the browser for rendering. The ob_gzhandler () function is a useful tool for compressing your output using gzip compression in your PHP web application. 1) ob_flush (), flush () in any combination with other output buffering functions; 2) changes to php. PHP has an exception model similar to that of other programming languages. This function discards the contents of the topmost output buffer and turns off this output buffering. W3Schools offers free online tutorials, references and exercises in all the major languages of the web. This parameter is a bitmask for the following options: debug_print_backtrace () options. Viewed 4k times Part of PHP Collective 1 I have a script that echo out content in a php script and resulting in a very large file, e. This function discards the contents of the output buffer. If you use XAMPP for instance, you can go to this link and check if output buffering is on or off. Use PHP’s Built-In Functions and Libraries. It is applied to prevent the page from showing up the content remained (for instance, prohibited pages). php with:The read callback must always return a session encoded (serialized) string, or an empty string if there is no data to read. It creates a new buffer each time however, so be careful. For example:In the sample plugin code, I have this PHP/HTML: ob_start(); // other plugin code <?php function plugin_rvce_options_page() { ?> <div&. ob_start is a PHP function which turns output buffering on. cache file created for the visited url and if there is a file I will print its content out. ob_start(), output buffer keeps everything in buffer without sending or displaying until it is flushed <?php ob_start(); //this has to be the first line of your page header(‘Location: page2. If multiple output callback functions are active, output is being filtered sequentially through each of them in nesting order. Share. the buffer is emptied and sent out. ＋ add a note. gzencode — Create a gzip compressed string. When you write your scripts, output buffering can be turned on by calling the ob_start function, and this is where it gets confusing, because you can actually start multiple "levels" of buffering — each call to ob_start will begin a new level of buffering. actually, It should show the header menu. PHP CLI no longer had the CGI environment variables to. ob_start echo's strings out still. 2. Some guides say you have to set output_buffering = Off in your php. 5 the headers are sent. Like so ob_start(null, 0, PHP_OUTPUT_HANDLER_REMOVABLE); However now that my page is live and not on WAMP the entire page now breaks and. If output_callback returns FALSE original input is sent to the browser. Kohana. Get content of output buffer using PHP ob_get_contents() function. x and PHP 5. Turn on output buffering at the top of your script with ob_start (). Store new value with phpScript1. PHP supports single line and multi line comments. Tổng kết, ob_start là một hàm quan trọng trong PHP để bắt đầu một output buffer và lưu trữ nội dung xuất ra từ mã PHP để xử lý sau này. I think that function will be prone to further bugs, therefor using ob_start/ob_end_clean is easier to comprehend and better for future code maintenance. php"); ?>. Otherwise ob_clean () will not work. That is, assume that you have 10KB of. Sehingga output tidak langsung ditampilkan ke dalam browser melainkan akan ditampilkan terakhir-terakhir menjelang program PHP selesai dieksekusi. Ejemplos de la función ob_start() en PHP: Aquí hay algunos ejemplos de cómo puede usar la función ob_start() en su script de PHP: Ejemplo 1: Enviar encabezados después de la salida. I almost looked around the internet on how to remove newlines in the strings and that's the common and fastest method to remove the newlines aside from using the slowly preg_replace() . 3. My problem is that I want to keep the shopping cart live so I don't want to cache it. Strange behavior ob_start. Return Values: The ob_get_length () function returns the length of the current output buffer in bytes as an integer. A session is started with the session_start () function. g. At the start yes, but i cant get it to work. In order to fix this problem, you would write something like this at the start of your page: <?php ob_start (); ?>. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more. 2. htaccess file. This reduces the size of the content being sent to the browser which might speed up the content transfer to the client. So every time you do an echo, the output of that is added to the buffer. จะเห็นว่าโค้ดด้านบนนี่ PHP แยกอยู่ของ PHP HTML แยกอยู่ของ HTML ทำให้ดูโค้ดได้ง่ายเวลามันอยู่ใน editor. You need to kill the script after a header redirect or the code will keep running. ini involving setting output_buffer and/or zlib. 출력 버퍼링이 켜져 있는 동안 헤더를 제외한 스크립트의 모든 출력을 내부 버퍼에 저장하며 실제 전송하지 않는다. ob_start();. When output buffer is ended it is sent to the client (browser). It will not work with ini_set() since it is PHP_INI_PERDIR. When you make an request, the script is being executed in apache user environment. It because of "Headers already sent". ob_gzhandler() Used as a callback function for ob_start() to compress the contents of the buffer when sending it to the browser: ob_implicit_flush() Turns implicit flushing on or off: ob_list_handlers() Returns an array of callback function names that are being used by the topmost output buffer: ob_start() When the return parameter is used, this function uses internal output buffering prior to PHP 7. Steps: Send new value to phpScript1 with clientScript1. Going to your php. See the syntax, usage, and examples of the ob_start () function in this article. A solution is to force a clean environment. Note: you need to call ob_start() before you start sending any output (using echo or print_r). In other words ob_end_clean () just means discard all things in buffer. W3Schools offers free online tutorials, references and exercises in all the major languages of the web. 6 daevid at daevid dot com. . If not it should be the output-handler you used, check your php. For WHM setting => Easy Apache => Exhaustive Options List < here enable - deflate tab >. Share. After that make changes in cPanel setting ##. This function is intended to be passed as a callback to ob_start (). aus. As a result, the first ob_start () will have an ob_get_level () of 2, the second will be 3, and so on. 0. Generate uniq ID. Tujuan dari pengaktifan penyimpanan output buffer adalah agar output php yang dihasilkan pada halaman website yang sudah di load secara penuh dapat tersimpan, sehingga ketika. I've choosed to use ob_start('callback') and ob_end_flush() at the end of the page. But it doesn't speed up your application/website. Bitmask of PHP_OUTPUT_HANDLER_* constants. So your callback is being skipped. aus; ob_list_handlers — List all output handlers in useob_start is a PHP function which turns output buffering on. instead of using variables or another thing; if you dont need to do anything with the output later, just use echo and free the memory. For what you are trying to do, there is no need to use ob_start and ob_flush. 3. How to get scripts output and process in another script in PHP using ob_start? 3. use ob_start () at start of your script also. Each try must have at least one corresponding catch or finally block. PHP ob_start skeleton only working first time. ob_start is a PHP function which turns output buffering on. 0. Before ob_gzhandler() actually sends compressed data, it determines what type of content encoding the browser will accept ("gzip", "deflate" or none at all) and will return its output. I would start by turning off all plugins, and see if there blank lines are still there. Which however is less reliable for multiple reasons: Even if <?php ob_start(); ?> starts the first script, whitespace or a BOM might get shuffled before, rendering it ineffective. But just what is output buffering, and what does it do!? With output buffering, PHP will hold data in the buffer and only release them at the end of the script (or when “buffer flush” is called). We hope this article has been informative and useful in understanding the ob_end. Parameters. I am using the code below, but the output shows up after the whole script has finished executing. So every time you do an echo, the output of that is added to the buffer. The output may be caught by another output buffer or, if there are no other output buffers, sent directly to the browser. at the second one; op_start is to buffer the output. 逐次echo. 2. <?php. On first glance, this problem looks like just a XSS vulnerability, but the `ob_start();` and `ob_end_clean();` mean that all of the output between the two are buffered and then discarded. The output_callback parameter may be bypassed by passing a NULL value. ob_start — Ausgabepufferung aktivieren. It deals with text (mostly) produced by php. First, let's note that one of the referenced files is `req. Esta função irá ativar o buffer de saída. What ob_flush () does is delete everything in the buffer, but keeps the buffer itself so more data can be put into it after the ob_flush () call. . PHP has a. output_add_rewrite_var — Setzt URL-Rewrite-Variablen. ob_start no almacena en el buffer las cabeceras, sino el contenido. ob_flush — Flush (send) the output buffer. php’); ob_end_flush(); //this has to be the last line of your page?> 2. php has php code in it then it would not be executed by the file_get_contents function as it will read the content of the file as a regular text. ob_clean (): bool. PHP under mod_php. ob_start(null, 4096); // Once the buffer size exceeds 4096 bytes, PHP automatically executes flush, ie. But it’s not! For one, PHP is the OG of programming for the web and WordPress, built in PHP, powers 25% of the web at large. ob_get_flush () flushes the output buffer, return it as a string and turns off output buffering. ob_end_clean cleans the buffer and stops output buffering without sending anything to the client, so you basically discard any output. ob_end_flush () turns off output buffering and sends the buffered data to the output, while flush () forces PHP to flush the output buffer immediately, sending. e. Changing this to true tells PHP to tell the output layer to flush itself automatically after every output block. つまり、別の ob_start () がアクティブなときに ob_start () を呼び出すことができます。. Use ob_get_status(). Using the ob_get_clean() function is straightforward. PHP is maybe the most used programming language for the web (w3techs give it almost 80% ) and it has its own solution for this – PHP sessions. It also sends an HTTP header indicating which compression algorithm was used. When the output buffer is to be sent, PHP starts sending the. This combination destroys the string value returned from the call. Let's implement PHP 's ob_start and ob_get_contents functions in python3. An array of string s. This callback is called internally by PHP when the session starts or when session_start() is called. However, after implementing this ob_start('error_logging'); the ob_flush's don't seem to work. Definition and Usage. Output buffering means that all output from the script is stored in an internal buffer instead of being…3. But here’s the problem – PHP will instantly parse and output the HTML as-it-is. If output buffering is not in effect, it returns an empty array. The ob_end_flush () function deletes the topmost output buffer and outputs all of its contents. After that, you can use ob_start () whenever you want to begin buffering and ob_flush () to flush the buffer whenever you want to stop buffering. These will either be a built-in save handler provided by default or by PHP. ob_gzhandler detects whether the browser supports any compression method internally. Yes, it doesn't works as expected, but you can get similar result by specifying chunk_size=2 in ob_start(): <?php ob_start ('ob_logstdout', 2);?> This will result that every new line (which ends with ) will flush output buffer. Follow edited Jan 4, 2014 at 7:53. any program written in PHP will be executed stepwise, one statement after another, which makes processing comparatively slow compared to others. Just make sure that you call ob_end_flush() the appropriate number of times. I'll explain: Here is a 'hello world' script for dompdf: require_once("In case you have done already HTML output prior the use of setcookie you need to find the place where your HTML output started. In other words, it creates the buffer (invisible holding. For this reason, any code inside the target file which should be executed as PHP code must be enclosed within valid PHP start and end tags . So the echo output will be buffered. They are : callback parameter, Chunk Size parameter. You need to kill the script after a header redirect or the code will keep running. Khi ob_start bật -> Bộ nhớ đệm bật. can please elaborate… how to kill. You probably need to include the fully qualified domain and path to the new url. Output streaming with PHP ob_start & ob_get_clean. This means that the output buffer is initiated and stopped with ob_end_clean(). ob_start and include issue. And you can't redirect using the header function after you output to the page. ob_implicit_flush () Turns implicit flushing on or off. Basic usage getting content between buffers and clearing, Nested output buffers, Running output buffer before any content, Processing the buffer via a callback, Using Output buffer to store contents in a file, useful for reports, invoices etc, Stream output to client, Capturing the output buffer to re-use later, Typical usage and reasons for using ob_start I have PHP (CGI) and Apache. An optional output_callback function may be specified. Tôi có 1 ví dụ đơn giản như sau: 出力バッファはスタッカブルであり、このため、他の ob_start() がアクティブの間に ob_start() をコールすることが可能です。この場合、 ob_end_flush() を適切な回数コールするようにしてください。 複数の出力コールバック関数がアクティブの場合、 ネストした.