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WordPress

wp_no_robots()

Since
3.3.0, 5.3.0
Source
wp-includes/deprecated.php:4182
Display a noindex meta tag.

Description

Outputs a noindex meta tag that tells web robots not to index the page content.

Typical usage is as a 'wp_head' callback:

add_action( 'wp_head', 'wp_no_robots' );

Compatibility

Deprecated in WordPress 5.7.0. Use wp_robots_no_robots() instead on 'wp_robots' filter.

WordPress
since 5.3.0
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.

Performance profile

How much work a call to wp_no_robots() 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
Moderate

Reads stored settings via get_option(), cached per request but not free on a cold cache.

Scaling
Constant

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

Instructions
11

Executed per call on PHP 8.5. The body compiles to 13.

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

  • optionoption read or writeget_option()called directly
  • hookthird-party callbacksdo_action()one call below wp_no_robots()
  • cacheobject cachewp_cache_get()one call below wp_no_robots()
  • serializeserialisationmaybe_unserialize()one call below wp_no_robots()

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

What one call costs · 1 distinct outcome

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

WhenInstructionsCalls it makes
always11_deprecated_function(), get_option()

Across PHP versions

Compiles the same on PHP 7.4, 8.1, 8.2, 8.3, 8.4, 8.5 and 8.6-dev: 13 instructions, 11 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

  • noindex()Displays a `noindex` meta tag if required by the blog configuration.

Source code

View on Trac View on GitHub 

function wp_no_robots() {	_deprecated_function( __FUNCTION__, '5.7.0', 'wp_robots_no_robots()' ); 	if ( get_option( 'blog_public' ) ) {		echo "<meta name='robots' content='noindex,follow' />\n";		return;	} 	echo "<meta name='robots' content='noindex,nofollow' />\n";}

Changelog

Introduced in 3.3.0. 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.

5.7.0
Deprecated. Use wp_robots_no_robots() instead on 'wp_robots' filter.from the docblock
5.3.0
Echo noindex,nofollow if search engine visibility is discouraged.from the docblock
3.3.0
Introduced.from the docblock

About this page

Parsed data
Generated from the wordpress-develop 7.0.4 tag, from src/wp-includes/deprecated.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.
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