What is output buffering in PHP?

✔ Recommended Answer

Output Buffering for Web Developers, a Beginner’s Guide:

Without output buffering (the default), your HTML is sent to the browser in pieces as PHP processes through your script. With output buffering, your HTML is stored in a variable and sent to the browser as one piece at the end of your script.

Advantages of output buffering for Web developers

  • 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 PHP processes the HTML.
  • All the fancy stuff we can do with PHP strings, we can now do with our whole HTML page as one variable.
  • If you've ever encountered the message "Warning: Cannot modify header information - headers already sent by (output)" while setting cookies, you'll be happy to know that output buffering is your answer.

Source: stackoverflow.com

Answered By: ax.

Method #2

Output buffering in PHP is a mechanism that allows the output generated by a PHP script to be stored in a buffer before it is sent to the browser or client. Instead of immediately sending the output to the browser, the output buffer captures the output and holds it until the buffer is flushed or cleared.

Output buffering can be enabled in PHP by using the ob_start() function at the beginning of a script. This function starts output buffering and any output generated by the script is stored in the buffer until it is flushed.

Output buffering is useful in several scenarios such as:

  1. Improving performance: By capturing all the output generated by a script and sending it at once, output buffering can reduce the number of HTTP requests made to the server, thereby improving performance.

  2. Conditional output: Output buffering allows you to conditionally display output generated by a script, such as displaying an error message only if a certain condition is met.

  3. Manipulating output: Output buffering can also be used to manipulate the output generated by a script, such as adding headers or footers to the output, or modifying the content of the output before it is sent to the client.

To stop output buffering and send the captured output to the client, you can use the ob_flush() or flush() function to send the output to the client and clear the output buffer. You can also use the ob_end_flush() or ob_end_clean() function to send or discard the captured output respectively, and stop output buffering.

Comments

Post a Comment

Most Popular

Remove Unicode Zero Width Space PHP

✔ Recommended Answer This: $newBody = str_replace("​", "", $newBody); presumes the text is HTML entity encoded. This: $newBody = str_replace("\xE2\x80\x8C", "", $newBody); should work if the offending characters are not encoded, but matches the wrong character (0xe2808c). To match the same character as #8203; you need 0xe2808b: $newBody = str_replace("\xE2\x80\x8B", "", $newBody); Source: stackoverflow.com Answered By: Jef Method #2 To remove Unicode zero width space (ZWSP) from a string in PHP, you can use the str_replace() function to replace the ZWSP character with an empty string. Here's an example: php $str = "Hello​ World" ; // Contains ZWSP after "Hello" // Replace ZWSP with an empty string $str = str_replace ( "\u{200B}" , "" , $str ); echo $str ; // Outputs "Hello World" without ZWSP In this example, the str_replace() functi
Read more

PhpStorm, return value is expected to be 'A', 'object' returned

Image
✔ Recommended Answer Has to be because object can be ANY class instance, even B etc. You can annotate the create() method with generics PHPDoc to tell that the return type will be the same as the input parameter class string. It gives more context info to the IDE. /** * @template T * * @param string $class * @return T */ private function create(string $class) : object { return new $class(); } P.S. Instead of create('B'); better use create(B::class) . This way the IDE can track the usages of that class for refactoring/search purposes etc. Source: stackoverflow.com Answered By: LazyOne Method #2 This error message suggests that your code is expecting a value of type 'A' to be returned, but instead, the code is returning an object. This error can occur in PhpStorm, or any other PHP development environment. To resolve this error, you should check the function or method that is returning the object and ensure that it is returning
Read more

Laravel file upload returns forbidden 403, file permission is 700 not 755

✔ Recommended Answer The issue you are facing could be due to incorrect file permissions for the storage folder. Here are some steps to fix the problem: SSH into your cPanel server. Change the permission of the storage folder to 755: chmod -R 755 storage/ This command will change the permission of the storage folder and all its contents to 755, which should give the web server permission to read and write to the folder. Check the ownership of the storage folder. Ensure that the owner of the folder is the same as the user running the web server (typically www-data on Apache): ls -l This command will list the files and folders in the current directory along with their ownership and permission details. Make sure that the owner of the storage folder is the same as the user running the web server. If the ownership is incorrect, you can change it using the following command: chown -R www-data:www-data storage/ This command will change the ownership of the storage folder and all its conten
Read more