WP_Text_Diff_Renderer_Table::_changed( array $orig, array $final ): string

Description

Compatibility

Present in every tracked release (6.7.7 to 7.1.0), and compiles on PHP 7.4 through 8.6-dev.

Parameters

$origarray

$finalarray

Return value

string

Performance profile

How much work a call to WP_Text_Diff_Renderer_Table::_changed() does, and what it touches: the algorithmic scaling, the Zend instruction count per call across PHP versions, the hooks it hands control to, and the core code that calls it. Measured from the compiled opcodes, not a stopwatch, so every number is identical on any machine running the same PHP version, and every function in core is ranked by cost.

Cost class

Trivial

Touches nothing outside its own arguments.

Scaling

Scales with input

The body loops, so the work grows with what you pass in.

Instructions

22–24

Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 167.

Plugin surface

None

Nothing here hands control to plugin code.

Called by

0

Nothing in core calls this; the cost is only what you spend yourself.

What one call costs · 1 distinct outcome

One number would be a lie: the work depends on which branch runs. These are every distinct cost WP_Text_Diff_Renderer_Table::_changed() can have, taken from its control-flow graph on PHP 8.5.

Uses · 6

• WP_Text_Diff_Renderer_Table::interleave_changed_lines()Takes changed blocks and matches which rows in orig turned into which rows in final.
• Text_Diff::__construct()Computes diffs between sequences of strings.
• WP_Text_Diff_Renderer_Table::_added()
• WP_Text_Diff_Renderer_Table::_deleted()
• WP_Text_Diff_Renderer_Table::deletedLine()
• WP_Text_Diff_Renderer_Table::addedLine()

Source code

View on Trac ↗View on GitHub ↗

287	public function _changed( $orig, $final ) { // phpcs:ignore Universal.NamingConventions.NoReservedKeywordParameterNames.finalFound288		$r = '';289 290		/*291		 * Does the aforementioned additional processing:292		 * *_matches tell what rows are "the same" in orig and final. Those pairs will be diffed to get word changes.293		 * - match is numeric: an index in other column.294		 * - match is 'X': no match. It is a new row.295		 * *_rows are column vectors for the orig column and the final column.296		 * - row >= 0: an index of the $orig or $final array.297		 * - row < 0: a blank row for that column.298		 */299		list($orig_matches, $final_matches, $orig_rows, $final_rows) = $this->interleave_changed_lines( $orig, $final );300 301		// These will hold the word changes as determined by an inline diff.302		$orig_diffs  = array();303		$final_diffs = array();304 305		// Compute word diffs for each matched pair using the inline diff.306		foreach ( $orig_matches as $o => $f ) {307			if ( is_numeric( $o ) && is_numeric( $f ) ) {308				$text_diff = new Text_Diff( 'auto', array( array( $orig[ $o ] ), array( $final[ $f ] ) ) );309				$renderer  = new $this->inline_diff_renderer();310				$diff      = $renderer->render( $text_diff );311 312				// If they're too different, don't include any <ins> or <del>'s.313				if ( preg_match_all( '!(<ins>.*?</ins>|<del>.*?</del>)!', $diff, $diff_matches ) ) {314					// Length of all text between <ins> or <del>.315					$stripped_matches = strlen( strip_tags( implode( ' ', $diff_matches[0] ) ) );316					/*317					 * Since we count length of text between <ins> or <del> (instead of picking just one),318					 * we double the length of chars not in those tags.319					 */320					$stripped_diff = strlen( strip_tags( $diff ) ) * 2 - $stripped_matches;321					$diff_ratio    = $stripped_matches / $stripped_diff;322					if ( $diff_ratio > $this->_diff_threshold ) {323						continue; // Too different. Don't save diffs.324					}325				}326 327				// Un-inline the diffs by removing <del> or <ins>.328				$orig_diffs[ $o ]  = preg_replace( '|<ins>.*?</ins>|', '', $diff );329				$final_diffs[ $f ] = preg_replace( '|<del>.*?</del>|', '', $diff );330			}331		}332 333		foreach ( array_keys( $orig_rows ) as $row ) {334			// Both columns have blanks. Ignore them.335			if ( $orig_rows[ $row ] < 0 && $final_rows[ $row ] < 0 ) {336				continue;337			}338 339			// If we have a word based diff, use it. Otherwise, use the normal line.340			if ( isset( $orig_diffs[ $orig_rows[ $row ] ] ) ) {341				$orig_line = $orig_diffs[ $orig_rows[ $row ] ];342			} elseif ( isset( $orig[ $orig_rows[ $row ] ] ) ) {343				$orig_line = htmlspecialchars( $orig[ $orig_rows[ $row ] ] );344			} else {345				$orig_line = '';346			}347 348			if ( isset( $final_diffs[ $final_rows[ $row ] ] ) ) {349				$final_line = $final_diffs[ $final_rows[ $row ] ];350			} elseif ( isset( $final[ $final_rows[ $row ] ] ) ) {351				$final_line = htmlspecialchars( $final[ $final_rows[ $row ] ] );352			} else {353				$final_line = '';354			}355 356			if ( $orig_rows[ $row ] < 0 ) { // Orig is blank. This is really an added row.357				$r .= $this->_added( array( $final_line ), false );358			} elseif ( $final_rows[ $row ] < 0 ) { // Final is blank. This is really a deleted row.359				$r .= $this->_deleted( array( $orig_line ), false );360			} else { // A true changed row.361				if ( $this->_show_split_view ) {362					$r .= '<tr>' . $this->deletedLine( $orig_line ) . $this->addedLine( $final_line ) . "</tr>\n";363				} else {364					$r .= '<tr>' . $this->deletedLine( $orig_line ) . '</tr><tr>' . $this->addedLine( $final_line ) . "</tr>\n";365				}366			}

Changelog

Introduced in 2.6.0. Unchanged from 6.7.7 through 7.1.0.

1. 6.7.7
2. 6.8.8
3. 6.9.7
4. 7.0.4
5. 7.1.0

Signature, return type and hooks compared across 5 parsed releases.

About this page

Parsed data

Generated from the wordpress-develop 6.8.8 tag, from src/wp-includes/class-wp-text-diff-renderer-table.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.

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