<?php namespace Foo; $a = [1, 2, 3]; \in_array($b, $a, true); // not optimized because variable array \in_array($b, [1, 2, 3]); // not optimized because missing strict param in_array($b, [1, 2, 3], true); // not optimized because no leading `\` or import \in_array($b, [1, 2, 3], true); // optimized
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