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WordPress

wp_initial_constants()

Since
3.0.0
Source
wp-includes/default-constants.php:18
Defines initial WordPress constants.

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_initial_constants() 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
119–149

Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 219.

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 one call costs · 15 distinct outcomes

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

WhenInstructionsCalls it makes
defined('WP_START_TIMESTAMP') && defined('WP_MEMORY_LIMIT') && defined('WP_MAX_MEMORY_LIMIT') && $current_limit_int === -1 && defined('WP_CONTENT_DIR') && defined('WP_DEBUG') && defined('SCRIPT_DEBUG')119–126define(), define(), define(), define(), define(), define(), define(), ini_get(), wp_convert_hr_to_bytes(), wp_convert_hr_to_bytes(), define(), define(), define(), define(), define()
defined('WP_START_TIMESTAMP') && defined('WP_MEMORY_LIMIT') && defined('WP_MAX_MEMORY_LIMIT') && $current_limit_int === -1 && defined('WP_CONTENT_DIR') && !defined('WP_DEBUG') && wp_get_development_mode() && defined('SCRIPT_DEBUG')124–131define(), define(), define(), define(), define(), define(), define(), ini_get(), wp_convert_hr_to_bytes(), wp_convert_hr_to_bytes(), wp_get_development_mode(), define(), define(), define(), define(), define()
defined('WP_START_TIMESTAMP') && defined('WP_MEMORY_LIMIT') && defined('WP_MAX_MEMORY_LIMIT') && $current_limit_int === -1 && defined('WP_DEBUG')125–134define(), define(), define(), define(), define(), define(), define(), ini_get(), wp_convert_hr_to_bytes(), wp_convert_hr_to_bytes(), define(), define(), define(), define(), define(), define()
defined('WP_START_TIMESTAMP') && defined('WP_MEMORY_LIMIT') && defined('WP_MAX_MEMORY_LIMIT') && $current_limit_int !== -1 && $wp_limit_int === -1 && isset($blog_id) && defined('WP_CONTENT_DIR') && defined('WP_DEVELOPMENT_MODE') && defined('WP_DEBUG') && defined('SCRIPT_DEBUG')126–131define(), define(), define(), define(), define(), define(), define(), ini_get(), wp_convert_hr_to_bytes(), wp_convert_hr_to_bytes(), ini_set(), define(), define(), define(), define(), define()
defined('WP_START_TIMESTAMP') && defined('WP_MEMORY_LIMIT') && defined('WP_MAX_MEMORY_LIMIT') && $current_limit_int === -1 && defined('WP_CONTENT_DIR') && !defined('WP_DEBUG') && !wp_get_development_mode() && defined('SCRIPT_DEBUG')127–135define(), define(), define(), define(), define(), define(), define(), ini_get(), wp_convert_hr_to_bytes(), wp_convert_hr_to_bytes(), wp_get_development_mode(), wp_get_environment_type(), define(), define(), define(), define(), define()
defined('WP_START_TIMESTAMP') && defined('WP_MEMORY_LIMIT') && defined('WP_MAX_MEMORY_LIMIT') && $current_limit_int === -1 && !defined('WP_CONTENT_DIR') && !defined('WP_DEBUG') && wp_get_development_mode() && defined('SCRIPT_DEBUG')130–137define(), define(), define(), define(), define(), define(), define(), ini_get(), wp_convert_hr_to_bytes(), wp_convert_hr_to_bytes(), define(), wp_get_development_mode(), define(), define(), define(), define(), define()
defined('WP_START_TIMESTAMP') && defined('WP_MEMORY_LIMIT') && defined('WP_MAX_MEMORY_LIMIT') && $current_limit_int === -1 && defined('WP_CONTENT_DIR') && !defined('WP_DEBUG') && wp_get_development_mode() && !defined('SCRIPT_DEBUG')131–139define(), define(), define(), define(), define(), define(), define(), ini_get(), wp_convert_hr_to_bytes(), wp_convert_hr_to_bytes(), wp_get_development_mode(), define(), define(), define(), define(), define(), define()
defined('WP_START_TIMESTAMP') && defined('WP_MEMORY_LIMIT') && defined('WP_MAX_MEMORY_LIMIT') && $current_limit_int !== -1 && $wp_limit_int === -1 && isset($blog_id) && defined('WP_CONTENT_DIR') && defined('WP_DEVELOPMENT_MODE') && !defined('WP_DEBUG') && wp_get_development_mode() && defined('SCRIPT_DEBUG')131–136define(), define(), define(), define(), define(), define(), define(), ini_get(), wp_convert_hr_to_bytes(), wp_convert_hr_to_bytes(), ini_set(), wp_get_development_mode(), define(), define(), define(), define(), define()
defined('WP_START_TIMESTAMP') && defined('WP_MEMORY_LIMIT') && defined('WP_MAX_MEMORY_LIMIT') && $current_limit_int === -1 && !defined('WP_CONTENT_DIR') && defined('WP_DEBUG') && !defined('SCRIPT_DEBUG')132–140define(), define(), define(), define(), define(), define(), define(), ini_get(), wp_convert_hr_to_bytes(), wp_convert_hr_to_bytes(), define(), define(), define(), define(), define(), define(), define()
defined('WP_START_TIMESTAMP') && defined('WP_MEMORY_LIMIT') && defined('WP_MAX_MEMORY_LIMIT') && $current_limit_int !== -1 && $wp_limit_int === -1 && isset($blog_id) && defined('WP_CONTENT_DIR') && defined('WP_DEVELOPMENT_MODE') && defined('WP_DEBUG') && !defined('SCRIPT_DEBUG')133–139define(), define(), define(), define(), define(), define(), define(), ini_get(), wp_convert_hr_to_bytes(), wp_convert_hr_to_bytes(), ini_set(), define(), define(), define(), define(), define(), define()
defined('WP_START_TIMESTAMP') && defined('WP_MEMORY_LIMIT') && defined('WP_MAX_MEMORY_LIMIT') && $current_limit_int === -1 && !defined('WP_CONTENT_DIR') && !defined('WP_DEBUG') && !wp_get_development_mode() && defined('SCRIPT_DEBUG')133–141define(), define(), define(), define(), define(), define(), define(), ini_get(), wp_convert_hr_to_bytes(), wp_convert_hr_to_bytes(), define(), wp_get_development_mode(), wp_get_environment_type(), define(), define(), define(), define(), define()
defined('WP_START_TIMESTAMP') && defined('WP_MEMORY_LIMIT') && defined('WP_MAX_MEMORY_LIMIT') && $current_limit_int === -1 && defined('WP_CONTENT_DIR') && !defined('WP_DEBUG') && !wp_get_development_mode() && !defined('SCRIPT_DEBUG')134–143define(), define(), define(), define(), define(), define(), define(), ini_get(), wp_convert_hr_to_bytes(), wp_convert_hr_to_bytes(), wp_get_development_mode(), wp_get_environment_type(), define(), define(), define(), define(), define(), define()
3 further outcomes, up to 149 instructions
defined('WP_START_TIMESTAMP') && defined('WP_MEMORY_LIMIT') && defined('WP_MAX_MEMORY_LIMIT') && $current_limit_int === -1 && !defined('WP_CONTENT_DIR') && !defined('WP_DEBUG') && wp_get_development_mode() && !defined('SCRIPT_DEBUG')137–145define(), define(), define(), define(), define(), define(), define(), ini_get(), wp_convert_hr_to_bytes(), wp_convert_hr_to_bytes(), define(), wp_get_development_mode(), define(), define(), define(), define(), define(), define()
defined('WP_START_TIMESTAMP') && defined('WP_MEMORY_LIMIT') && defined('WP_MAX_MEMORY_LIMIT') && $current_limit_int !== -1 && $wp_limit_int === -1 && isset($blog_id) && defined('WP_CONTENT_DIR') && defined('WP_DEVELOPMENT_MODE') && !defined('WP_DEBUG') && wp_get_development_mode() && !defined('SCRIPT_DEBUG')138–143define(), define(), define(), define(), define(), define(), define(), ini_get(), wp_convert_hr_to_bytes(), wp_convert_hr_to_bytes(), ini_set(), wp_get_development_mode(), define(), define(), define(), define(), define(), define()
defined('WP_START_TIMESTAMP') && defined('WP_MEMORY_LIMIT') && defined('WP_MAX_MEMORY_LIMIT') && $current_limit_int === -1 && !defined('WP_CONTENT_DIR') && !defined('WP_DEBUG') && !wp_get_development_mode() && !defined('SCRIPT_DEBUG')140–149define(), define(), define(), define(), define(), define(), define(), ini_get(), wp_convert_hr_to_bytes(), wp_convert_hr_to_bytes(), define(), wp_get_development_mode(), wp_get_environment_type(), define(), define(), define(), define(), define(), define()

This body has more branch combinations than are worth enumerating, so the table covers the outcomes found first rather than every one that exists.

Across PHP versions

PHPCompiledExecutedBranchesNotes
8.6-dev219119–14925
8.5219119–14925
8.4219119–149253 fewer instructions than PHP 8.3
8.3222119–15225
8.2222119–15225
8.1222119–152251 fewer instruction than PHP 7.4
7.4223119–15325

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 · 6

Source code

View on Trac View on GitHub 

function wp_initial_constants() {	global $blog_id, $wp_version; 	/**#@+	 * Constants for expressing human-readable data sizes in their respective number of bytes.	 *	 * @since 4.4.0	 * @since 6.0.0 `PB_IN_BYTES`, `EB_IN_BYTES`, `ZB_IN_BYTES`, and `YB_IN_BYTES` were added.	 */	define( 'KB_IN_BYTES', 1024 );	define( 'MB_IN_BYTES', 1024 * KB_IN_BYTES );	define( 'GB_IN_BYTES', 1024 * MB_IN_BYTES );	define( 'TB_IN_BYTES', 1024 * GB_IN_BYTES );	define( 'PB_IN_BYTES', 1024 * TB_IN_BYTES );	define( 'EB_IN_BYTES', 1024 * PB_IN_BYTES );	define( 'ZB_IN_BYTES', 1024 * EB_IN_BYTES );	define( 'YB_IN_BYTES', 1024 * ZB_IN_BYTES );	/**#@-*/ 	// Start of run timestamp.	if ( ! defined( 'WP_START_TIMESTAMP' ) ) {		define( 'WP_START_TIMESTAMP', microtime( true ) );	} 	$current_limit     = ini_get( 'memory_limit' );	$current_limit_int = wp_convert_hr_to_bytes( $current_limit ); 	// Define memory limits.	if ( ! defined( 'WP_MEMORY_LIMIT' ) ) {		if ( false === wp_is_ini_value_changeable( 'memory_limit' ) ) {			define( 'WP_MEMORY_LIMIT', $current_limit );		} elseif ( is_multisite() ) {			define( 'WP_MEMORY_LIMIT', '64M' );		} else {			define( 'WP_MEMORY_LIMIT', '40M' );		}	} 	if ( ! defined( 'WP_MAX_MEMORY_LIMIT' ) ) {		if ( false === wp_is_ini_value_changeable( 'memory_limit' ) ) {			define( 'WP_MAX_MEMORY_LIMIT', $current_limit );		} elseif ( -1 === $current_limit_int || $current_limit_int > 256 * MB_IN_BYTES ) {			define( 'WP_MAX_MEMORY_LIMIT', $current_limit );		} elseif ( wp_convert_hr_to_bytes( WP_MEMORY_LIMIT ) > 256 * MB_IN_BYTES ) {			define( 'WP_MAX_MEMORY_LIMIT', WP_MEMORY_LIMIT );		} else {			define( 'WP_MAX_MEMORY_LIMIT', '256M' );		}	} 	// Set memory limits.	$wp_limit_int = wp_convert_hr_to_bytes( WP_MEMORY_LIMIT );	if ( -1 !== $current_limit_int && ( -1 === $wp_limit_int || $wp_limit_int > $current_limit_int ) ) {		ini_set( 'memory_limit', WP_MEMORY_LIMIT );	} 	if ( ! isset( $blog_id ) ) {		$blog_id = 1;	} 	if ( ! defined( 'WP_CONTENT_DIR' ) ) {		define( 'WP_CONTENT_DIR', ABSPATH . 'wp-content' ); // No trailing slash, full paths only - WP_CONTENT_URL is defined further down.	} 	/*	 * Add define( 'WP_DEVELOPMENT_MODE', 'core' ), or define( 'WP_DEVELOPMENT_MODE', 'plugin' ), or	 * define( 'WP_DEVELOPMENT_MODE', 'theme' ), or define( 'WP_DEVELOPMENT_MODE', 'all' ) to wp-config.php	 * to signify development mode for WordPress core, a plugin, a theme, or all three types respectively.	 */	if ( ! defined( 'WP_DEVELOPMENT_MODE' ) ) {		define( 'WP_DEVELOPMENT_MODE', '' );	} 	// Add define( 'WP_DEBUG', true ); to wp-config.php to enable display of notices during development.	if ( ! defined( 'WP_DEBUG' ) ) {		if ( wp_get_development_mode() || 'development' === wp_get_environment_type() ) {			define( 'WP_DEBUG', true );		} else {			define( 'WP_DEBUG', false );		}

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/default-constants.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.
Corrections
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