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PHP PHP Functions Function Returns and More PHP Closures

Florios Demosten
Florios Demosten
1,617 Points
Posted by Florios Demosten
Florios Demosten
1,617 Points

global vs use ()

Can some one explain why you would use use() over global?

manav
manav
5,466 Points

In closure construct, 'use' keyword takes the current value of variable which is at the time of function definition. Even if this variable's value changes before the closure call, it still maintains the old value. Whereas, with 'global' keyword, function gets the latest value of variable.

<?php

$num = 0; // value of $num before closure

$closure = function() use($num){ 
  return $num; // current value of $num
};

$num = 2; // value of $num after closure

echo $closure(); // displays 0 even if $num changed to 2 before call

function display(){
  global $num; // latest value of $num
  return $num;
}

$num = 6;

echo display(); // displays 6 as $num changed to 6 before call