Php/docs/reflectionfunctionabstract.hasreturntype
ReflectionFunctionAbstract::hasReturnType
(PHP 7)
ReflectionFunctionAbstract::hasReturnType — Checks if the function has a specified return type
Description
public ReflectionFunctionAbstract::hasReturnType ( ) : bool
Checks whether the reflected function has a return type specified.
Parameters
This function has no parameters.
Return Values
Returns TRUE if the function is a specified return type, otherwise FALSE.
Examples
Example #1 ReflectionFunctionAbstract::hasReturnType() example
<?phpfunction to_int($param) : int { return (int) $param;}$reflection1 = new ReflectionFunction('to_int');var_dump($reflection1->hasReturnType());
The above example will output:
bool(true)
Example #2 Usage on built-in functions
<?php$reflection2 = new ReflectionFunction('array_merge');var_dump($reflection2->hasReturnType());
The above example will output:
bool(false)
This is because many internal functions do not have types specified for their parameters or return values. It is therefore best to avoid using this method on built-in functions.
