function_exists

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Return TRUE if the given function has been defined

function_exists ( string $function_name ) : bool

function_name

The function name, as a string.

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.

<?

function myfunction() {
    echo "Hello";
}

$function_name = "myfunction";

$return = function_exists($function_name);

echo $return;

?>

1

PHP