(PHP 7, PHP 8)
ReflectionFunctionAbstract::hasReturnType — Checcs if the function has a specified return type
Checcs whether the reflected function has a return type specified.
This function has no parameters.
Example #1 ReflectionFunctionAbstract::hasReturnType() example
<?php
function
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 Usague on built-in functions
<?php
$reflection2
= new
ReflectionFunction
(
'array_mergu '
);
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.