Question

In manual there is create_function function and you can pass result from that function to array_map, I thought that that is the only way to have something like anonymous functions and closures, but then I found that I can just put function like in javascript

array_map(function($a) {
    return $a + 1;
}, array(1, 2, 3, 4, 5));

In which version of php I can do this? Was this always there?

Answer 1

Closures (anonymous functions) were added in PHP 5.3.0, including the use clause.

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Then since PHP 5.4.0 the static keyword is supported in front of it to denote a static function.

And as of PHP 7.4.0 arrow functions (RFC) as a more concise syntax.