PclZipUtilPathReduction( $p_dir )
- Source
wp-admin/includes/class-pclzip.php:5434
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
$p_dir
Performance profile
How much work a call to PclZipUtilPathReduction() 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
- Scaling
- Scales with input
- Instructions
- 5–21
- Plugin surface
- None
- Called by
- 5
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 66.
Nothing here hands control to plugin code.
5 places in core call this, so the cost is paid more often than your own code shows.
What one call costs · 2 distinct outcomes
One number would be a lie: the work depends on which branch runs. These are every distinct cost PclZipUtilPathReduction() can have, taken from its control-flow graph on PHP 8.5.
| When | Instructions | Calls it makes |
|---|---|---|
$p_dir == "" | 5 | none |
$p_dir != "" && !$i && !$v_skip | 18–21 | explode() |
Across PHP versions
| PHP | Compiled | Executed | Branches | Notes |
|---|---|---|---|---|
| 8.6-dev | 66 | 5–21 | 12 | |
| 8.5 | 66 | 5–21 | 12 | |
| 8.4 | 66 | 5–21 | 12 | |
| 8.3 | 66 | 5–21 | 12 | |
| 8.2 | 66 | 5–21 | 12 | 1 more instruction than PHP 8.1 |
| 8.1 | 65 | 5–23 | 12 | 1 fewer instruction than PHP 7.4 |
| 7.4 | 66 | 5–23 | 12 |
An instruction is not a fixed amount of time, so a matching count is not necessarily the same speed; what it rules out is a difference in the work itself.
Used by · 5
Source code
function PclZipUtilPathReduction($p_dir) { $v_result = ""; // ----- Look for not empty path if ($p_dir != "") { // ----- Explode path by directory names $v_list = explode("/", $p_dir); // ----- Study directories from last to first $v_skip = 0; for ($i=sizeof($v_list)-1; $i>=0; $i--) { // ----- Look for current path if ($v_list[$i] == ".") { // ----- Ignore this directory // Should be the first $i=0, but no check is done } else if ($v_list[$i] == "..") { $v_skip++; } else if ($v_list[$i] == "") { // ----- First '/' i.e. root slash if ($i == 0) { $v_result = "/".$v_result; if ($v_skip > 0) { // ----- It is an invalid path, so the path is not modified // TBC $v_result = $p_dir; $v_skip = 0; } } // ----- Last '/' i.e. indicates a directory else if ($i == (sizeof($v_list)-1)) { $v_result = $v_list[$i]; } // ----- Double '/' inside the path else { // ----- Ignore only the double '//' in path, // but not the first and last '/' } } else { // ----- Look for item to skip if ($v_skip > 0) { $v_skip--; } else { $v_result = $v_list[$i].($i!=(sizeof($v_list)-1)?"/".$v_result:""); } } } // ----- Look for skip if ($v_skip > 0) { while ($v_skip > 0) { $v_result = '../'.$v_result; $v_skip--; } } } // ----- Return return $v_result; }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-admin/includes/class-pclzip.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.