(PHP 5 >= 5.2.0, PHP 7)
ReflectionFunction::isDisabled — Checks if function is disabled
public ReflectionFunction::isDisabled ( ) : bool
Checks if the function is disabled, via the disable_functions directive.
This function has no parameters.
true if it's disable, otherwise false
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https://www.php.net/manual/en/reflectionfunction.isdisabled.php