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WordPress

twentyeleven_url_grabber(): string|bool

Since
Twenty Eleven 1.0
Source
wp-content/themes/twentyeleven/functions.php:702
Returns the URL for the first link found in the post content.

Compatibility

WordPress
since Twenty Eleven 1.0
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|bool
URL or false when no link is present.

Performance profile

How much work a call to twentyeleven_url_grabber() 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
Heavy

Reaches the database via get_post().

Scaling
Constant

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

Instructions
9–14

Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 15.

Plugin surface
None

Nothing here hands control to plugin code.

Called by
1

1 place in core call this, so the cost is paid more often than your own code shows.

What it touches

  • querycontent queryget_post()one call below twentyeleven_url_grabber()
  • hookthird-party callbacksapply_filters()one call below twentyeleven_url_grabber()

Further down the call graph this can also reach option, transient, cache and serialize. Those are the worst case, several calls deep and usually down an error path, not what a normal call pays.

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 twentyeleven_url_grabber() can have, taken from its control-flow graph on PHP 8.5.

WhenInstructionsCalls it makes
!preg_match()9get_the_content(), preg_match()
preg_match()14get_the_content(), preg_match(), esc_url_raw()

Across PHP versions

Compiles the same on PHP 7.4, 8.1, 8.2, 8.3, 8.4, 8.5 and 8.6-dev: 15 instructions, 9–14 executed per call, 1 branch. 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 · 2

Used by · 1

Source code

View on Trac View on GitHub 

function twentyeleven_url_grabber() {	if ( ! preg_match( '/<a\s[^>]*?href=[\'"](.+?)[\'"]/is', get_the_content(), $matches ) ) {		return false;	} 	return esc_url_raw( $matches[1] );}

Changelog

Introduced in Twenty Eleven 1.0. 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-content/themes/twentyeleven/functions.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.
Corrections
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