Text_Diff::_check( $from_lines, $to_lines )
- Source
wp-includes/Text/Diff.php:237
Description
This is here only for debugging purposes.
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
$from_lines$to_lines
Performance profile
How much work a call to Text_Diff::_check() 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
- 16–58
- Plugin surface
- None
- Called by
- 0
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 79.
Nothing here hands control to plugin code.
Nothing in core calls this; the cost is only what you spend yourself.
What it touches
- serializeserialisation
serialize()called directly
What one call costs · 4 distinct outcomes
One number would be a lie: the work depends on which branch runs. These are every distinct cost Text_Diff::_check() can have, taken from its control-flow graph on PHP 8.5.
| When | Instructions | Calls it makes |
|---|---|---|
| always | 16 | serialize(), ->getOriginal(), serialize() |
| always | 26 | serialize(), ->getOriginal(), serialize(), serialize(), ->getFinal(), serialize() |
| always | 39 | serialize(), ->getOriginal(), serialize(), serialize(), ->getFinal(), serialize(), ->reverse(), serialize(), ->getOriginal(), serialize() |
| always | 49–58 | serialize(), ->getOriginal(), serialize(), serialize(), ->getFinal(), serialize(), ->reverse(), serialize(), ->getOriginal(), serialize(), serialize(), ->getFinal(), serialize() |
Across PHP versions
Compiles the same on PHP 7.4, 8.1, 8.2, 8.3, 8.4, 8.5 and 8.6-dev: 79 instructions, 16–58 executed per call, 8 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 · 4
- Text_Diff::getOriginal()Gets the original set of lines.
- Text_Exception::__construct()
- Text_Diff::getFinal()Gets the final set of lines.
- Text_Diff::reverse()Computes a reversed diff.
Source code
function _check($from_lines, $to_lines) { if (serialize($from_lines) != serialize($this->getOriginal())) { throw new Text_Exception("Reconstructed original does not match"); } if (serialize($to_lines) != serialize($this->getFinal())) { throw new Text_Exception("Reconstructed final does not match"); } $rev = $this->reverse(); if (serialize($to_lines) != serialize($rev->getOriginal())) { throw new Text_Exception("Reversed original does not match"); } if (serialize($from_lines) != serialize($rev->getFinal())) { throw new Text_Exception("Reversed final does not match"); } $prevtype = null; foreach ($this->_edits as $edit) { if ($prevtype !== null && $edit instanceof $prevtype) { throw new Text_Exception("Edit sequence is non-optimal"); } $prevtype = get_class($edit); } return true; }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.