php array_map with static method of object

As per the documentation,

return array_map('self::pay', $model_list);

Note that your attempt included () in the method name string, which would be wrong

Let me extend @mark-baker's answer:

if you want to call a static method of another class, you have to put the full namespace into the quotes:

return array_map('Other\namespace\CustomClass::pay', $model_list);

Using the class per use is not enough:

// this is not enough:// use Other\namespace\CustomClass;return array_map('CustomClass::pay', $model_list); //does not work

PHP 5.6 - 7.3:

array_map('self::pay'], $bill_list); # worksarray_map(['self', 'pay'], $bill_list); # worksarray_map('\\Some\\Name\\Space\\SomeClass::method',$array); # worksarray_map(['\\Some\\Name\\Space\\SomeClass','method'],$array); # worksuse \Some\Name\Space\SomeClass;  # alias to local namespace fails:array_map('SomeClass::method',$array); # failsarray_map(['SomeClass','method'],$array); # fails

The error given is:

PHP Warning: array_map() expects parameter 1 to be a valid callback, class 'SomeClass' not found

use SomeLongClassName as Foo; # alias within namespace fails:array_map("Foo::method",$array); # failsarray_map(['Foo','method'],$array); # fails

The error given is:

PHP Warning: array_map() expects parameter 1 to be a valid callback, class 'Foo' not found

One workaround to shorten the line length and/or re-use it:

const SomeClass = '\\Some\\Name\\Space\\SomeClass';array_map([SomeClass,'method'],$array); # works

or if you use the foreign static method many times over in a class:

class MyClass{    # in PHP 7.1+ you can make this private:    const SCMethod = '\\Some\\Name\\Space\\SomeClass::method';    public function myMethod($array){        return array_map(self::SCMethod, $array); # works    }}