3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = null; $b = 'test'; $c = null; $test1 = function() use (&$a, &$b, &$c) { $value = 1; $a = &$value; $b = &$value; $c = array( 'c' => &$value, ); }; $test1(); echo 'a: '; var_dump($a); echo 'b: '; var_dump($b); echo 'c: '; var_dump($c); exit;

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