<?php
$empty_func = function($a){
};
$new_arr = array_map(function($a) {return $a[0];}, $argv);
$callback = function($b){return $b['id'];};
$long_callback = function($c)use ($d,&$e){
return $c['id'];
};
function doSomething($a,$b) {
echo 'Hello world!';
}
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