(PHP 7)
ReflectionFunctionAbstract::getReturnType — Gets the specified return type of a function
Gets the specified return type of a reflected function.
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Returns a ReflectionType object if a return type is
specified, NULL otherwise.
Example #1 ReflectionFunctionAbstract::getReturnType() example
<?php
function to_int($param) : int {
return (int) $param;
}
$reflection1 = new ReflectionFunction('to_int');
echo $reflection1->getReturnType();
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int
Example #2 Usage on built-in functions
<?php
$reflection2 = new ReflectionFunction('array_merge');
var_dump($reflection2->getReturnType());
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null
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.