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<?php $foo = [ 0 => ['test'], 1 => null ]; $bar = array_filter($foo, 'is_null'); var_dump(array_diff($foo, $bar));
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Array to string conversion in /in/uojqP on line 9 array(1) { [0]=> array(1) { [0]=> string(4) "test" } }

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