(PHP 7)
ReflectionFunctionAbstract::hasReturnType — Checks if the function has a specified return type
public ReflectionFunctionAbstract::hasReturnType ( ) : bool
Checks whether the reflected function has a return type specified.
This function has no parameters.
Returns true if the function is a specified return type, otherwise false.
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 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.
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https://www.php.net/manual/en/reflectionfunctionabstract.hasreturntype.php