ReflectionParameter::isCallable

(PHP 5 >= 5.4.0, PHP 7, PHP 8)

ReflectionParameter::isCallableReturns whether parameter MUST be callable

Warning

本函数已自 PHP 8.0.0 起被废弃。强烈建议不要依赖本函数。

See the example below for an alternative way to derive this information.

说明

public ReflectionParameter::isCallable ( ) : bool

Warning

本函数还未编写文档,仅有参数列表。

参数

此函数没有参数。

返回值

Returns true if the parameter is callable, false if it is not or null on failure.

范例

Example #1 PHP 8.0.0 equivalent

As of PHP 8.0.0, the following code will report if a type supports callables, including as part of a union.

<?php
function declaresCallable(ReflectionParameter $reflectionParameter): bool
{
    
$reflectionType $reflectionParameter->getType();

    if (!
$reflectionType) return false;

    
$types $reflectionType instanceof ReflectionUnionType
        
$reflectionType->getTypes()
        : [
$reflectionType];

   return 
in_array('callable'array_map(fn(ReflectionNamedType $t) => $t->getName(), $types));
}
?>

User Contributed Notes

me at abiusx dot com 15-Jan-2016 05:18
Apparently this does not return true for callback arguments to many of the internal functions, such as array_map and array_walk.