Text_MappedDiff::__construct( array $from_lines, array $to_lines, array $mapped_from_lines, array $mapped_to_lines )
- Source
wp-includes/Text/Diff.php:289
Description
This can be used to compute things like case-insensitive diffs, or diffs which ignore changes in white-space.
Compatibility
- WordPress
- core
- PHP
- 7.4–8.6-dev
- 6.7.7
- 6.8.8
- 6.9.7
- 7.0.4
- 7.1.0
Present in every tracked release (6.7.7 to 7.1.0), and compiles on PHP 7.4 through 8.6-dev.
Parameters
$from_linesarray- An array of strings.
$to_linesarray- An array of strings.
$mapped_from_linesarray- This array should have the same size number of elements as $from_lines. The elements in $mapped_from_lines and $mapped_to_lines are what is actually compared when computing the diff.
$mapped_to_linesarray- This array should have the same number of elements as $to_lines.
Performance profile
How much work a call to Text_MappedDiff::__construct() does, and what it touches: the algorithmic scaling, the Zend instruction count per call across PHP versions, the hooks it hands control to, and the core code that calls it. Measured from the compiled opcodes, not a stopwatch, so every number is identical on any machine running the same PHP version, and every function in core is ranked by cost.
- Cost class
- Light
- Scaling
- Scales with input
- Instructions
- 19–33
- Plugin surface
- None
- Called by
- 1
Touches nothing outside its own arguments.
The body loops, so the work grows with what you pass in.
Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 64.
Nothing here hands control to plugin code.
1 place in core call this, so the cost is paid more often than your own code shows.
What one call costs · 3 distinct outcomes
One number would be a lie: the work depends on which branch runs. These are every distinct cost Text_MappedDiff::__construct() can have, taken from its control-flow graph on PHP 8.5.
| When | Instructions | Calls it makes |
|---|---|---|
!$i | 19 | ::Text_Diff() |
!$i | 26 | assert(), ::Text_Diff() |
!$i | 33 | assert(), assert(), ::Text_Diff() |
Across PHP versions
Compiles the same on PHP 7.4, 8.1, 8.2, 8.3, 8.4, 8.5 and 8.6-dev: 64 instructions, 19–33 executed per call, 5 branches. The work does not change between versions.
An instruction is not a fixed amount of time, so a matching count is not necessarily the same speed; what it rules out is a difference in the work itself.
Uses · 1
- Text_Diff::Text_Diff()PHP4 constructor.
Used by · 1
- Text_MappedDiff::Text_MappedDiff()PHP4 constructor.
Source code
function __construct($from_lines, $to_lines, $mapped_from_lines, $mapped_to_lines) { assert(count($from_lines) == count($mapped_from_lines)); assert(count($to_lines) == count($mapped_to_lines)); parent::Text_Diff($mapped_from_lines, $mapped_to_lines); $xi = $yi = 0; for ($i = 0; $i < count($this->_edits); $i++) { $orig = &$this->_edits[$i]->orig; if (is_array($orig)) { $orig = array_slice($from_lines, $xi, count($orig)); $xi += count($orig); } $final = &$this->_edits[$i]->final; if (is_array($final)) { $final = array_slice($to_lines, $yi, count($final)); $yi += count($final); } } }Changelog
Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
About this page
- Parsed data
- Generated from the wordpress-develop 7.1.0 tag, from
src/wp-includes/Text/Diff.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it. - Corrections
- Something wrong on this page? Report it and it gets fixed in the next regeneration.