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(PHP 7)
ReflectionFunctionAbstract::getReturnType — Gets the specified return type of a function
Gets the specified return type of a reflected function.
此函数没有参数。
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 ();
以上例程会输出:
int
Example #2 Usage on built-in functions
<?php
$reflection2 = new ReflectionFunction ( 'array_merge' );
var_dump ( $reflection2 -> getReturnType ());
以上例程会输出:
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.