<?php function foo1(&$bar = 1) {} function foo2(&$bar = true) {} function foo3(&$bar = []) {} function foo4(&$bar = null) {} foo1($bar1); foo2($bar2); foo3($bar3); foo4($bar4); var_dump($bar1, $bar2, $bar3, $bar4);
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Value for `_results` contains invalid data `array`