wppaste
WordPress

getid3_matroska::EBML2Int( string $EBMLstring ): int|float|false

Source
wp-includes/ID3/module.audio-video.matroska.php:1583

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

$EBMLstringstring

Return value

int|float|false

Performance profile

How much work a call to getid3_matroska::EBML2Int() 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
Constant

No loop in the body: the same number of instructions runs whatever you pass in.

Instructions
18–31

Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 80.

Plugin surface
None

Nothing here hands control to plugin code.

Called by
2

2 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 getid3_matroska::EBML2Int() can have, taken from its control-flow graph on PHP 8.5.

WhenInstructionsCalls it makes
$first_byte_int18–31ord(), chr(), ::getid3_lib()
!$first_byte_int25ord(), ::getid3_lib()

Across PHP versions

Compiles the same on PHP 7.4, 8.1, 8.2, 8.3, 8.4, 8.5 and 8.6-dev: 80 instructions, 18–31 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 · 1

Used by · 2

Source code

View on Trac View on GitHub 

	private static function EBML2Int($EBMLstring) {		// http://matroska.org/specs/ 		// Element ID coded with an UTF-8 like system:		// 1xxx xxxx                                  - Class A IDs (2^7 -2 possible values) (base 0x8X)		// 01xx xxxx  xxxx xxxx                       - Class B IDs (2^14-2 possible values) (base 0x4X 0xXX)		// 001x xxxx  xxxx xxxx  xxxx xxxx            - Class C IDs (2^21-2 possible values) (base 0x2X 0xXX 0xXX)		// 0001 xxxx  xxxx xxxx  xxxx xxxx  xxxx xxxx - Class D IDs (2^28-2 possible values) (base 0x1X 0xXX 0xXX 0xXX)		// Values with all x at 0 and 1 are reserved (hence the -2). 		// Data size, in octets, is also coded with an UTF-8 like system :		// 1xxx xxxx                                                                              - value 0 to  2^7-2		// 01xx xxxx  xxxx xxxx                                                                   - value 0 to 2^14-2		// 001x xxxx  xxxx xxxx  xxxx xxxx                                                        - value 0 to 2^21-2		// 0001 xxxx  xxxx xxxx  xxxx xxxx  xxxx xxxx                                             - value 0 to 2^28-2		// 0000 1xxx  xxxx xxxx  xxxx xxxx  xxxx xxxx  xxxx xxxx                                  - value 0 to 2^35-2		// 0000 01xx  xxxx xxxx  xxxx xxxx  xxxx xxxx  xxxx xxxx  xxxx xxxx                       - value 0 to 2^42-2		// 0000 001x  xxxx xxxx  xxxx xxxx  xxxx xxxx  xxxx xxxx  xxxx xxxx  xxxx xxxx            - value 0 to 2^49-2		// 0000 0001  xxxx xxxx  xxxx xxxx  xxxx xxxx  xxxx xxxx  xxxx xxxx  xxxx xxxx  xxxx xxxx - value 0 to 2^56-2 		$first_byte_int = ord($EBMLstring[0]);		if (0x80 & $first_byte_int) {			$EBMLstring[0] = chr($first_byte_int & 0x7F);		} elseif (0x40 & $first_byte_int) {			$EBMLstring[0] = chr($first_byte_int & 0x3F);		} elseif (0x20 & $first_byte_int) {			$EBMLstring[0] = chr($first_byte_int & 0x1F);		} elseif (0x10 & $first_byte_int) {			$EBMLstring[0] = chr($first_byte_int & 0x0F);		} elseif (0x08 & $first_byte_int) {			$EBMLstring[0] = chr($first_byte_int & 0x07);		} elseif (0x04 & $first_byte_int) {			$EBMLstring[0] = chr($first_byte_int & 0x03);		} elseif (0x02 & $first_byte_int) {			$EBMLstring[0] = chr($first_byte_int & 0x01);		} elseif (0x01 & $first_byte_int) {			$EBMLstring[0] = chr($first_byte_int & 0x00);		} 		return getid3_lib::BigEndian2Int($EBMLstring);	}

Changelog

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 7.1.0 tag, from src/wp-includes/ID3/module.audio-video.matroska.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.