getid3_handler::fgets(): string|false
- Source
wp-includes/ID3/getid3.php:2326
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.
Return value
string|false
Performance profile
How much work a call to getid3_handler::fgets() 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
- 15–24
- Plugin surface
- None
- Called by
- 0
Touches nothing outside its own arguments.
The body loops, so the work grows with how much data it finds.
Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 57.
Nothing here hands control to plugin code.
Nothing in core calls this; the cost is only what you spend yourself.
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 getid3_handler::fgets() can have, taken from its control-flow graph on PHP 8.5.
| When | Instructions | Calls it makes |
|---|---|---|
| always | 15–21 | none |
$thischar == "\n" | 16–18 | fgetc() |
$thischar != "\n" && feof() | 22–24 | fgetc(), feof() |
$prevchar == "\r" && $thischar != "\n" | 22 | fgetc(), fseek() |
Across PHP versions
| PHP | Compiled | Executed | Branches | Notes |
|---|---|---|---|---|
| 8.6-dev | 57 | 15–24 | 9 | |
| 8.5 | 57 | 15–24 | 9 | 2 more instructions than PHP 8.4 |
| 8.4 | 55 | 14–23 | 9 | 3 fewer instructions than PHP 8.3 |
| 8.3 | 58 | 15–23 | 9 | |
| 8.2 | 58 | 15–23 | 9 | |
| 8.1 | 58 | 15–23 | 9 | 3 more instructions than PHP 7.4 |
| 7.4 | 55 | 15–23 | 9 |
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.
Source code
protected function fgets() { // must be able to handle CR/LF/CRLF but not read more than one lineend $buffer = ''; // final string we will return $prevchar = ''; // save previously-read character for end-of-line checking if ($this->data_string_flag) { while (true) { $thischar = substr($this->data_string, $this->data_string_position++, 1); if (($prevchar == "\r") && ($thischar != "\n")) { // read one byte too many, back up $this->data_string_position--; break; } $buffer .= $thischar; if ($thischar == "\n") { break; } if ($this->data_string_position >= $this->data_string_length) { // EOF break; } $prevchar = $thischar; } } else { // Ideally we would just use PHP's fgets() function, however... // it does not behave consistently with regards to mixed line endings, may be system-dependent // and breaks entirely when given a file with mixed \r vs \n vs \r\n line endings (e.g. some PDFs) //return fgets($this->getid3->fp); while (true) { $thischar = fgetc($this->getid3->fp); if (($prevchar == "\r") && ($thischar != "\n")) { // read one byte too many, back up fseek($this->getid3->fp, -1, SEEK_CUR); break; } $buffer .= $thischar; if ($thischar == "\n") { break; } if (feof($this->getid3->fp)) { break; } $prevchar = $thischar; } } return $buffer; }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/getid3.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.