getid3_riff::ParseBITMAPINFOHEADER( string $BITMAPINFOHEADER, bool $littleEndian = true ): array
- Source
wp-includes/ID3/module.audio-video.riff.php:2174
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
$BITMAPINFOHEADERstring$littleEndianbooloptional- Default:
true
Return value
array
Performance profile
How much work a call to getid3_riff::ParseBITMAPINFOHEADER() 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
- Constant
- Instructions
- 57–58
- Plugin surface
- None
- Called by
- 2
Touches nothing outside its own arguments.
No loop in the body: the same number of instructions runs whatever you pass in.
Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 59.
Nothing here hands control to plugin code.
2 places in core call this, so the cost is paid more often than your own code shows.
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 getid3_riff::ParseBITMAPINFOHEADER() can have, taken from its control-flow graph on PHP 8.5.
| When | Instructions | Calls it makes |
|---|---|---|
| always | 57–58 | array_map() |
Across PHP versions
| PHP | Compiled | Executed | Branches | Notes |
|---|---|---|---|---|
| 8.6-dev | 59 | 57–58 | 1 | |
| 8.5 | 59 | 57–58 | 1 | |
| 8.4 | 59 | 57–58 | 1 | 33 fewer instructions than PHP 8.3 |
| 8.3 | 92 | 90–91 | 1 | |
| 8.2 | 92 | 90–91 | 1 | |
| 8.1 | 92 | 90–91 | 1 | |
| 7.4 | 92 | 90–91 | 1 |
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 · 2
Source code
public static function ParseBITMAPINFOHEADER($BITMAPINFOHEADER, $littleEndian=true) { $parsed = array(); $parsed['biSize'] = substr($BITMAPINFOHEADER, 0, 4); // number of bytes required by the BITMAPINFOHEADER structure $parsed['biWidth'] = substr($BITMAPINFOHEADER, 4, 4); // width of the bitmap in pixels $parsed['biHeight'] = substr($BITMAPINFOHEADER, 8, 4); // height of the bitmap in pixels. If biHeight is positive, the bitmap is a 'bottom-up' DIB and its origin is the lower left corner. If biHeight is negative, the bitmap is a 'top-down' DIB and its origin is the upper left corner $parsed['biPlanes'] = substr($BITMAPINFOHEADER, 12, 2); // number of color planes on the target device. In most cases this value must be set to 1 $parsed['biBitCount'] = substr($BITMAPINFOHEADER, 14, 2); // Specifies the number of bits per pixels $parsed['biSizeImage'] = substr($BITMAPINFOHEADER, 20, 4); // size of the bitmap data section of the image (the actual pixel data, excluding BITMAPINFOHEADER and RGBQUAD structures) $parsed['biXPelsPerMeter'] = substr($BITMAPINFOHEADER, 24, 4); // horizontal resolution, in pixels per metre, of the target device $parsed['biYPelsPerMeter'] = substr($BITMAPINFOHEADER, 28, 4); // vertical resolution, in pixels per metre, of the target device $parsed['biClrUsed'] = substr($BITMAPINFOHEADER, 32, 4); // actual number of color indices in the color table used by the bitmap. If this value is zero, the bitmap uses the maximum number of colors corresponding to the value of the biBitCount member for the compression mode specified by biCompression $parsed['biClrImportant'] = substr($BITMAPINFOHEADER, 36, 4); // number of color indices that are considered important for displaying the bitmap. If this value is zero, all colors are important $parsed = array_map('getid3_lib::'.($littleEndian ? 'Little' : 'Big').'Endian2Int', $parsed); $parsed['fourcc'] = substr($BITMAPINFOHEADER, 16, 4); // compression identifier return $parsed; }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/ID3/module.audio-video.riff.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.