Text_Diff_Engine_shell::diff( array $from_lines, array $to_lines ): array

34    function diff($from_lines, $to_lines)35    {36        array_walk($from_lines, array('Text_Diff', 'trimNewlines'));37        array_walk($to_lines, array('Text_Diff', 'trimNewlines'));38 39        $temp_dir = Text_Diff::_getTempDir();40 41        // Execute gnu diff or similar to get a standard diff file.42        $from_file = tempnam($temp_dir, 'Text_Diff');43        $to_file = tempnam($temp_dir, 'Text_Diff');44        $fp = fopen($from_file, 'w');45        fwrite($fp, implode("\n", $from_lines));46        fclose($fp);47        $fp = fopen($to_file, 'w');48        fwrite($fp, implode("\n", $to_lines));49        fclose($fp);50        $diff = shell_exec($this->_diffCommand . ' ' . $from_file . ' ' . $to_file);51        unlink($from_file);52        unlink($to_file);53 54        if (is_null($diff)) {55            // No changes were made56            return array(new Text_Diff_Op_copy($from_lines));57        }58 59        $from_line_no = 1;60        $to_line_no = 1;61        $edits = array();62 63        // Get changed lines by parsing something like:64        // 0a1,265        // 1,2c4,666        // 1,5d667        preg_match_all('#^(\d+)(?:,(\d+))?([adc])(\d+)(?:,(\d+))?$#m', $diff,68            $matches, PREG_SET_ORDER);69 70        foreach ($matches as $match) {71            if (!isset($match[5])) {72                // This paren is not set every time (see regex).73                $match[5] = false;74            }75 76            if ($match[3] == 'a') {77                $from_line_no--;78            }79 80            if ($match[3] == 'd') {81                $to_line_no--;82            }83 84            if ($from_line_no < $match[1] || $to_line_no < $match[4]) {85                // copied lines86                assert($match[1] - $from_line_no == $match[4] - $to_line_no);87                array_push($edits,88                    new Text_Diff_Op_copy(89                        $this->_getLines($from_lines, $from_line_no, $match[1] - 1),90                        $this->_getLines($to_lines, $to_line_no, $match[4] - 1)));91            }92 93            switch ($match[3]) {94            case 'd':95                // deleted lines96                array_push($edits,97                    new Text_Diff_Op_delete(98                        $this->_getLines($from_lines, $from_line_no, $match[2])));99                $to_line_no++;100                break;101 102            case 'c':103                // changed lines104                array_push($edits,105                    new Text_Diff_Op_change(106                        $this->_getLines($from_lines, $from_line_no, $match[2]),107                        $this->_getLines($to_lines, $to_line_no, $match[5])));108                break;109 110            case 'a':111                // added lines112                array_push($edits,113                    new Text_Diff_Op_add(
When	Instructions	Calls it makes
`$diff === null`	71	`array_walk(), array_walk(), ::Text_Diff(), tempnam(), tempnam(), fopen(), fwrite(), fclose(), fopen(), fwrite(), fclose(), shell_exec(), unlink(), unlink()`
`$diff !== null && empty($from_lines)`	80–81	`array_walk(), array_walk(), ::Text_Diff(), tempnam(), tempnam(), fopen(), fwrite(), fclose(), fopen(), fwrite(), fclose(), shell_exec(), unlink(), unlink(), preg_match_all()`
`$diff !== null && !empty($from_lines)`	104–105	`array_walk(), array_walk(), ::Text_Diff(), tempnam(), tempnam(), fopen(), fwrite(), fclose(), fopen(), fwrite(), fclose(), shell_exec(), unlink(), unlink(), preg_match_all(), ->_getLines(), ->_getLines(), array_push()`
PHP	Compiled	Executed	Branches	Notes
8.6-dev	225	71–105	14
8.5	225	71–105	14
8.4	225	71–105	14	6 fewer instructions than PHP 8.3
8.3	231	77–111	14
8.2	231	77–111	14	1 more instruction than PHP 8.1
8.1	230	77–111	14
7.4	230	77–111	14