function_exists
Return TRUE if the given function has been defined
Syntax
function_exists ( string $function_name ) : bool
Parameters
function_name
The function name, as a string.
Return
Returns TRUE if function_name exists and is a function, FALSE otherwise.
Note: This function will return FALSE for constructs, such as include_once and echo.
Examples
<?
function myfunction() {
echo "Hello";
}
$function_name = "myfunction";
$return = function_exists($function_name);
echo $return;
?>
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