wppaste
WordPress

get_url_in_content( string $content ): string|false

Since
3.6.0
Source
wp-includes/formatting.php:5825
Extracts and returns the first URL from passed content.

Compatibility

WordPress
since 3.6.0
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.

Parameters

$contentstring
A string which might contain an A element with a non-empty href attribute.

Return value

string|false
Database-escaped URL via esc_url() if found, otherwise false.

Performance profile

How much work a call to get_url_in_content() 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
Light

Touches nothing outside its own arguments.

Scaling
Scales with input

The body loops, so the work grows with what you pass in.

Instructions
4–24

Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 26.

Plugin surface
None

Nothing here hands control to plugin code.

Called by
3

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

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

WhenInstructionsCalls it makes
empty($content)4none
!empty($content) && !->next_tag()13->next_tag()
!empty($content) && ->next_tag() && is_string($href) && $href !== ""24->next_tag(), ->get_attribute(), sanitize_url()

Across PHP versions

Compiles the same on PHP 7.4, 8.1, 8.2, 8.3, 8.4, 8.5 and 8.6-dev: 26 instructions, 4–24 executed per call, 4 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 · 2

Used by · 3

Source code

View on Trac View on GitHub 

function get_url_in_content( $content ) {	if ( empty( $content ) ) {		return false;	} 	$processor = new WP_HTML_Tag_Processor( $content );	while ( $processor->next_tag( 'A' ) ) {		$href = $processor->get_attribute( 'href' );		if ( is_string( $href ) && '' !== $href ) {			return sanitize_url( $href );		}	} 	return false;}

Changelog

Introduced in 3.6.0. 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 6.9.7 tag, from src/wp-includes/formatting.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.
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