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<?php function myFunction($arg1 = '', $arg2 = '') { return 'My args: ' . $arg1 . ' & ' . $arg2; } $arg1 = "foo"; $result = myFunction($arg1); var_dump($result === 'My args: ' . $arg1 . ' & ' . $arg2); $arg1 = "foo"; $arg2 = null; $result = myFunction($arg1, $arg2); var_dump($result === 'My args: ' . $arg1 . ' & ' . $arg2); $arg1 = "foo"; $arg2 = "bar"; $result = myFunction($arg1, $arg2); var_dump($result === 'My args: ' . $arg1 . ' & ' . $arg2);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined variable $arg2 in /in/uuuTU on line 8 bool(true) bool(true) bool(true)

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