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- <?php
- define("DIFF_EQUAL", "=");
- define("DIFF_ADDED", "+");
- define("DIFF_DELETED", "-");
- define("DIFF_MOVED", "M");
- function diff(
- $old,
- $new,
- $show_equals = false,
- $format_line_function = 'format_line'
- ) {
- $oldArr = str_split_on_new_line($old);
- $newArr = str_split_on_new_line($new);
- $oldCount = count($oldArr);
- $newCount = count($newArr);
- $max = max($oldCount, $newCount);
-
- $deleted = array_diff_assoc($oldArr, $newArr);
- $added = array_diff_assoc($newArr, $oldArr);
- $moved = array();
- foreach ($added as $key => $candidate) {
- foreach ($deleted as $index => $content) {
- if ($candidate == $content) {
- $moved[$key] = $candidate;
- unset($added[$key]);
- unset($deleted[$index]);
- break;
- }
- }
- }
- $output = '';
- for ($i = 0; $i < $max; $i++) {
-
- if (isset ($deleted[$i]) && isset($added[$i])) {
- $output .= $format_line_function($i, DIFF_DELETED, $deleted[$i]);
- $output .= $format_line_function($i, DIFF_ADDED, $added[$i]);
- }
- elseif (isset ($deleted[$i]) && !isset ($added[$i])) {
- $output .= $format_line_function($i, DIFF_DELETED, $deleted[$i]);
- }
- elseif (isset ($added[$i]) && !isset ($deleted[$i])) {
- $output .= $format_line_function($i, DIFF_ADDED, $added[$i]);
- }
- elseif (isset ($moved[$i])) {
- $output .= $format_line_function($i, DIFF_MOVED, $newArr[$i]);
- }
- elseif ($show_equals) {
- $output .= $format_line_function($i, DIFF_EQUAL, $newArr[$i]);
- } else {
-
- }
- }
- return $output;
- }
- function str_split_on_new_line($str)
- {
- $content = array();
- if (api_strpos($str, "\r\n") !== false) {
- $content = explode("\r\n", $str);
- } elseif (api_strpos($str, "\n") !== false) {
- $content = explode("\n", $str);
- } elseif (api_strpos($str, "\r") !== false) {
- $content = explode("\r", $str);
- } else {
- $content[] = $str;
- }
- return $content;
- }
- function format_line($line, $type, $value, $skip_empty = false)
- {
- if (trim($value) == "" && $skip_empty) {
- return "";
- } elseif (trim($value) == "") {
- $value = ' ';
- }
- switch ($type) {
- case DIFF_EQUAL:
-
- return '<span class="diffEqual" >' . $value . '</span><br />' . "\n";
- break;
- case DIFF_MOVED:
-
- return '<span class="diffMoved" >' . $value . '</span><br />' . "\n";
- break;
- case DIFF_ADDED:
-
- return '<span class="diffAdded" >' . $value . '</span><br />' . "\n";
- break;
- case DIFF_DELETED:
-
- return '<span class="diffDeleted" >' . $value . '</span><br />' . "\n";
- break;
- }
- }
- function format_table_line($line, $type, $value, $skip_empty = false)
- {
- if (trim($value) == "" && $skip_empty) {
- return "";
- } elseif (trim($value) == "") {
- $value = ' ';
- }
- switch ($type) {
- case DIFF_EQUAL:
-
- return '<tr><td></td><td bgcolor="#FFFFFF">' . $value . '</td></tr>' . "\n";
- break;
- case DIFF_MOVED:
-
- return '<tr><td></td><td bgcolor="#FFFFAA">' . $value . '</td></tr>' . "\n";
- break;
- case DIFF_ADDED:
-
- return '<tr><td></td><td bgcolor="#CCFFCC">' . $value . '</td></tr>' . "\n";
- break;
- case DIFF_DELETED:
-
- return '<tr><td></td><td bgcolor="#FFAAAA">' . $value . '</td></tr>' . "\n";
- }
- }
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