$value) { $this->assertEquals($columnExpectedResult[$key], $value); } } public function testColumnReverseSort() { $columnBase = $columnExpectedResult = array( 'A','B','Z', 'AA','AB','AZ', 'BA','BB','BZ', 'ZA','ZB','ZZ', 'AAA','AAB','AAZ', 'ABA','ABB','ABZ', 'AZA','AZB','AZZ', 'BAA','BAB','BAZ', 'BBA','BBB','BBZ', 'BZA','BZB','BZZ' ); shuffle($columnBase); $columnExpectedResult = array_reverse($columnExpectedResult); usort($columnBase, array('PHPExcel_ReferenceHelper','columnReverseSort')); foreach ($columnBase as $key => $value) { $this->assertEquals($columnExpectedResult[$key], $value); } } }