<?php $a = 1; // Your case function b() { $a = 4; return true; } // Passing by reference function c(&$d) { $d = 5; return true; } // Using return function d($d) { $d = 6; return $d; } b(); var_dump($a); c($a); var_dump($a); $a = d($a); var_dump($a);
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