(PHP 4 >= 4.3.0, PHP 5, PHP 7, PHP 8)
ob_get_clean — Get the contents of the active output buffer and turn it off
ob_get_clean(): string|false
This function calls the output handler (with the PHP_OUTPUT_HANDLER_CLEAN and PHP_OUTPUT_HANDLER_FINAL flags), discards it's return value, returns the contents of the active output buffer and turns off the active output buffer.
ob_get_clean() will fail without an active output buffer started with the PHP_OUTPUT_HANDLER_REMOVABLE flag.
ob_get_clean() will discard the contents of the active output buffer even if it was started without the PHP_OUTPUT_HANDLER_CLEANABLE flag.
This function has no parameters.
Returns the contents of the active output buffer on success or false on failure.
ob_get_clean() will return false but will not generate an E_NOTICE if there is no active output buffer.
If the function fails it generates an E_NOTICE.
Example #1 A simple ob_get_clean() example
<?php ob_start(); echo "Hello World"; $out = ob_get_clean(); $out = strtolower($out); var_dump($out); ?>
The above example will output:
string(11) "hello world"
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https://www.php.net/manual/en/function.ob-get-clean.php