Php/docs/reflectionfunctionabstract.hasreturntype
ReflectionFunctionAbstract::hasReturnType
(PHP 7)
ReflectionFunctionAbstract::hasReturnType — Checks if the function has a specified return type
说明
public ReflectionFunctionAbstract::hasReturnType ( ) : bool
Checks whether the reflected function has a return type specified.
参数
此函数没有参数。
返回值
Returns true if the function is a specified return type, otherwise false.
范例
Example #1 ReflectionFunctionAbstract::hasReturnType() example
<?phpfunction to_int($param) : int { return (int) $param;}$reflection1 = new ReflectionFunction('to_int');var_dump($reflection1->hasReturnType());
以上例程会输出：
bool(true)
Example #2 Usage on built-in functions
<?php$reflection2 = new ReflectionFunction('array_merge');var_dump($reflection2->hasReturnType());
以上例程会输出：
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.
