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<?php $m = [ 'foo' => 'aaa', 'bar' => 'bbb', 'baz' => 'ccc', ]; $v = 'bbb'; var_dump(in_array($v, $m, true)); $v = 'zzz'; var_dump(in_array($v, $m, true));
Output for git.master, git.master_jit
bool(true) bool(false)

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