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<?php // $x = 'foo'; # notice this doesn't actually exist $y = null; # exists but null $z = 'foo'; # exists and not null var_dump(array_key_exists('x', compact('x'))); // false var_dump(array_key_exists('y', compact('y'))); // true var_dump(array_key_exists('z', compact('z'))); // true
Output for git.master, git.master_jit, rfc.property-hooks
Warning: compact(): Undefined variable $x in /in/TLdZI on line 7 bool(false) bool(true) bool(true)

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