What is the use of OB_start () in PHP?
The ob_start () of the PHP Programming Language helps in enabling the Output Buffer/Buffering before any type of echoing in any type of some HTML content in the PHP script. The ob_start () function don’t accepts any parameter specifically but it works by accepting some optional parameters.
What are the parameters OB_start () function can accept?
The ob_start () function don’t accepts any parameter specifically but it works by accepting some optional parameters. They are : callback parameter, Chunk Size parameter and Flags Parameter.
What is the difference between Ob_start() and OB_flush()?
When the script finishes running, or you call ob_flush (), that stored output is sent to the browser (and gzipped first if you use ob_gzhandler, which means it downloads faster). The most common reason to use ob_start is as a way to collect data that would otherwise be sent to the browser. 1-Well, you have more control over the output.
What is OB_gzhandler() function in PHP?
ob_gzhandler () function exists to facilitate sending gz-encoded data to web browsers that support compressed web pages. ob_gzhandler () determines what type of content encoding the browser will accept and will return its output accordingly.
What is Ob_start and Ob_flush in PHP?
Nesting. Buffers can be nested, so while one buffer is active, another ob_start() activates a new buffer. So ob_end_flush() and ob_flush() are not really sending the buffer to the output, but to the parent buffer. And only when there is no parent buffer, contents is sent to browser or terminal.
What is the use of Ob_clean?
The ob_clean() function deletes all of the contents of the topmost output buffer, preventing them from getting sent to the browser.
What is use of Ob_end_clean in PHP?
The ob_end_clean() function deletes the topmost output buffer and all of its contents without sending anything to the browser.
What is Ob_get_contents?
ob_get_contents — Return the contents of the output buffer.
What is OB flush?
The ob_flush() function outputs the contents of the topmost output buffer and then clears the buffer of the contents. The output may be caught by another output buffer or, if there are no other output buffers, sent directly to the browser.
What is Ob_start?
The ob_start() function creates an output buffer. A callback function can be passed in to do processing on the contents of the buffer before it gets flushed from the buffer. Flags can be used to permit or restrict what the buffer is able to do.
What does Ob_get_contents do in PHP?
The ob_get_contents() function returns the contents of the topmost output buffer.
What is OB_GZhandler?
ob_gzhandler () function exists to facilitate sending gz-encoded data to web browsers that support compressed web pages. ob_gzhandler () determines what type of content encoding the browser will accept and will return its output accordingly.
What is the flags parameter in PHP?
The flags parameter is a bitmask that controls the operations that can be performed on the output buffer. The default is to allow output buffers to be cleaned, flushed and removed, which can be set explicitly via PHP_OUTPUT_HANDLER_CLEANABLE | PHP_OUTPUT_HANDLER_FLUSHABLE | PHP_OUTPUT_HANDLER_REMOVABLE, or PHP_OUTPUT_HANDLER_STDFLAGS as shorthand.
What does 0 mean in a chunk_size function?
The default value 0 means that the output function will only be called when the output buffer is closed.
Can you use PHP to create a static HTML page?
16 years ago. You can use PHP to generate a static HTML page. Useful if you have a complex script that, for performance reasons, you do not want site visitors to run repeatedly on demand. A "cron" job can execute the PHP script to create the HTML page.
How does PHP work?
PHP is an interpreted language thus each statement is executed one after another, therefore PHP tends to send HTML to browsers in chunks thus reducing performance. Using output buffering the generated HTML gets stored in a buffer or a string variable and is sent to the buffer to render after the execution of the last statement in the PHP script.
What is callback function?
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 callback function is generally used for compressing the HTML content.
