wppaste
WordPress

wp_not_installed()

Since
3.0.0
Source
wp-includes/load.php:942
Redirects to the installer if WordPress is not installed.

Description

Dies with an error message when Multisite is enabled.

Compatibility

WordPress
since 3.0.0
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_not_installed() 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

Only touches the object cache, via wp_cache_get().

Scaling
Constant

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

Instructions
4–37

Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 38.

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 it touches

  • cacheobject cachewp_cache_get()one call below wp_not_installed()
  • hookthird-party callbacksapply_filters()one call below wp_not_installed()

Further down the call graph this can also reach query, option, serialize 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 · 4 distinct outcomes

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

WhenInstructionsCalls it makes
is_blog_installed()4is_blog_installed()
!is_blog_installed() && wp_installing()7is_blog_installed(), wp_installing()
!is_blog_installed() && !wp_installing() && !is_multisite()31is_blog_installed(), wp_installing(), nocache_headers(), is_multisite(), wp_guess_url(), wp_redirect(), exit()
!is_blog_installed() && !wp_installing() && is_multisite()37is_blog_installed(), wp_installing(), nocache_headers(), is_multisite(), __(), wp_die(), wp_guess_url(), wp_redirect(), exit()

Across PHP versions

PHPCompiledExecutedBranchesNotes
8.6-dev384–373
8.5384–373
8.4384–3732 more instructions than PHP 8.3
8.3364–353
8.2364–353
8.1364–353
7.4364–353

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 · 8

Source code

View on Trac View on GitHub 

function wp_not_installed() {	if ( is_blog_installed() || wp_installing() ) {		return;	} 	nocache_headers(); 	if ( is_multisite() ) {		wp_die( __( 'The site you have requested is not installed properly. Please contact the system administrator.' ) );	} 	require ABSPATH . WPINC . '/kses.php';	require ABSPATH . WPINC . '/pluggable.php'; 	$link = wp_guess_url() . '/wp-admin/install.php'; 	wp_redirect( $link );	die();}

Changelog

Introduced in 3.0.0. 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/load.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.
Corrections
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