<?php
$sum; // global variable
function outer() {
$hundred_more = 100;
$sum = function ($a, $b) {
return $a + $b + (++$hundred_more);
};
echo $hundred_more;
}
outer(); // define sum at the global scope and print 100
alert($sum(5, 10)); // 116
alert($sum(5, 10)); // 117
outer(); // redefine sum at the global scope and print 100
alert($sum(5, 10)); // 116
alert($sum(5, 10)); // 117
100
Fatal error: Uncaught Error: Call to undefined function alert() in /in/4lZWP:13
Stack trace:
#0 {main}
thrown in /in/4lZWP on line 13
Process exited with code 255.