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<?php $values = array(0, '', NULL, FALSE); $result = array(); foreach ($values as $x) { foreach ($values as $y) { $result[var_export($x, TRUE)][var_export($y, TRUE)] = in_array($x, array($y)); } } var_export($result);
Output for git.master, git.master_jit, rfc.property-hooks
array ( 0 => array ( 0 => true, '\'\'' => false, 'NULL' => true, 'false' => true, ), '\'\'' => array ( 0 => false, '\'\'' => true, 'NULL' => true, 'false' => true, ), 'NULL' => array ( 0 => true, '\'\'' => true, 'NULL' => true, 'false' => true, ), 'false' => array ( 0 => true, '\'\'' => true, 'NULL' => true, 'false' => true, ), )

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