Apparently this does not return true for callback arguments to many of the internal functions, such as array_map and array_walk.
(PHP 5 >= 5.4.0, PHP 7, PHP 8)
ReflectionParameter::isCallable — Returns whether parameter MUST be callable
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.
此函数没有参数。
示例 #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));
}
?>Apparently this does not return true for callback arguments to many of the internal functions, such as array_map and array_walk.