wppaste
WordPress

Date::date_rfc2822( string $date ): int|false

Source
wp-includes/SimplePie/src/Parse/Date.php:766
Parse RFC2822's date format

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

$datestring

Return value

int|false
Timestamp

Performance profile

How much work a call to Date::date_rfc2822() 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
13–94

Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 105.

Plugin surface
None

Nothing here hands control to plugin code.

Called by
0

Nothing in core calls this; the cost is only what you spend yourself.

What one call costs · 3 distinct outcomes

One number would be a lie: the work depends on which branch runs. These are every distinct cost Date::date_rfc2822() can have, taken from its control-flow graph on PHP 8.5.

WhenInstructionsCalls it makes
!preg_match()13–40->remove_rfc2822_comments(), preg_match()
preg_match() && !isset($match)58–89->remove_rfc2822_comments(), preg_match(), strtolower(), gmmktime()
preg_match() && isset($match)63–94->remove_rfc2822_comments(), preg_match(), strtolower(), strtoupper(), gmmktime()

Across PHP versions

PHPCompiledExecutedBranchesNotes
8.6-dev10413–9381 fewer instruction than PHP 8.5
8.510513–948
8.410513–948
8.310513–948
8.210513–948
8.110513–948
7.410513–948

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

  • \SimplePie\Parse\Date::remove_rfc2822_comments()

Source code

View on Trac View on GitHub 

    public function date_rfc2822(string $date)    {        static $pcre;        if (!$pcre) {            $wsp = '[\x09\x20]';            $fws = '(?:' . $wsp . '+|' . $wsp . '*(?:\x0D\x0A' . $wsp . '+)+)';            $optional_fws = $fws . '?';            $day_name = $this->day_pcre;            $month = $this->month_pcre;            $day = '([0-9]{1,2})';            $hour = $minute = $second = '([0-9]{2})';            $year = '([0-9]{2,4})';            $num_zone = '([+\-])([0-9]{2})([0-9]{2})';            $character_zone = '([A-Z]{1,5})';            $zone = '(?:' . $num_zone . '|' . $character_zone . ')';            $pcre = '/(?:' . $optional_fws . $day_name . $optional_fws . ',)?' . $optional_fws . $day . $fws . $month . $fws . $year . $fws . $hour . $optional_fws . ':' . $optional_fws . $minute . '(?:' . $optional_fws . ':' . $optional_fws . $second . ')?' . $fws . $zone . '/i';        }        if (preg_match($pcre, $this->remove_rfc2822_comments($date), $match)) {            /*            Capturing subpatterns:            1: Day name            2: Day            3: Month            4: Year            5: Hour            6: Minute            7: Second            8: Timezone ±            9: Timezone hours            10: Timezone minutes            11: Alphabetic timezone            */             $day = (int) $match[2];            // Find the month number            $month = $this->month[strtolower($match[3])];            $year = (int) $match[4];            $hour = (int) $match[5];            $minute = (int) $match[6];            // Second is optional, if it is empty set it to zero            $second = (int) $match[7];             $tz_sign = $match[8];            $tz_hour = (int) $match[9];            $tz_minute = (int) $match[10];            $tz_code = isset($match[11]) ? strtoupper($match[11]) : '';             // Numeric timezone            if ($tz_sign !== '') {                $timezone = $tz_hour * 3600;                $timezone += $tz_minute * 60;                if ($tz_sign === '-') {                    $timezone = 0 - $timezone;                }            }            // Character timezone            elseif (isset($this->timezone[$tz_code])) {                $timezone = $this->timezone[$tz_code];            }            // Assume everything else to be -0000            else {                $timezone = 0;            }             // Deal with 2/3 digit years            if ($year < 50) {                $year += 2000;            } elseif ($year < 1000) {                $year += 1900;            }             return gmmktime($hour, $minute, $second, $month, $day, $year) - $timezone;        }         return false;    }

Changelog

2 changes between 6.7.7 and 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.

6.9.7
Parameter $date retyped from untyped to string.verified against source
6.9.7
Return type changed from int to int|false.verified against source

About this page

Parsed data
Generated from the wordpress-develop 7.1.0 tag, from src/wp-includes/SimplePie/src/Parse/Date.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.
Corrections
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