wppaste
WordPress

wp_get_raw_referer(): string|false

Since
4.5.0
Source
wp-includes/functions.php:2010
Retrieves unvalidated referer from the '_wp_http_referer' URL query variable or the HTTP referer.

Description

If the value of the '_wp_http_referer' URL query variable is not a string then it will be ignored.

Do not use for redirects, use wp_get_referer() instead.

Compatibility

WordPress
since 4.5.0
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|false
Referer URL on success, false on failure.

Performance profile

How much work a call to wp_get_raw_referer() 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
7–17

Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 25.

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

WhenInstructionsCalls it makes
empty($value)7–11none
!empty($value)13–17wp_unslash()

Across PHP versions

Compiles the same on PHP 7.4, 8.1, 8.2, 8.3, 8.4, 8.5 and 8.6-dev: 25 instructions, 7–17 executed per call, 3 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

  • wp_unslash()Removes slashes from a string or recursively removes slashes from strings within an array.

Used by · 2

Source code

View on Trac View on GitHub 

function wp_get_raw_referer() {	if ( ! empty( $_REQUEST['_wp_http_referer'] ) && is_string( $_REQUEST['_wp_http_referer'] ) ) {		return wp_unslash( $_REQUEST['_wp_http_referer'] );	} elseif ( ! empty( $_SERVER['HTTP_REFERER'] ) ) {		return wp_unslash( $_SERVER['HTTP_REFERER'] );	} 	return false;}

Changelog

Introduced in 4.5.0. 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-includes/functions.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.
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