(PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)
ob_clean — Clean (erase) the contents of the active output buffer
ob_clean(): bool
This function calls the output handler (with the PHP_OUTPUT_HANDLER_CLEAN flag), discards it's return value and cleans (erases) the contents of the active output buffer.
This function does not turn off the active output buffer like ob_end_clean() or ob_get_clean() does.
ob_clean() will fail without an active output buffer started with the PHP_OUTPUT_HANDLER_CLEANABLE flag.
This function has no parameters.
If the function fails it generates an E_NOTICE.
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https://www.php.net/manual/en/function.ob-clean.php