list_core_update( object $update )

Compatibility

Present in every tracked release (6.7.7 to 7.1.0), and compiles on PHP 7.4 through 8.6-dev.

Parameters

$updateobject

Performance profile

How much work a call to list_core_update() 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

Heavy

Reads or writes the filesystem via file_exists().

Scaling

Constant

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

Instructions

155–218

Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 358.

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 it touches

• filesystemfilesystem accessfile_exists()called directly
• hookthird-party callbacksapply_filters()one call below list_core_update()
• optionnetwork optionget_site_option()one call below list_core_update()
• transienttransientget_site_transient()one call below list_core_update()

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

What one call costs · 16 distinct outcomes

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

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

Uses · 11

• wp_get_wp_version()Returns the current WordPress version.
• get_locale()Retrieves the current locale.
• get_core_updates()Gets available core updates.
• __()Retrieves the translation of $text.
• esc_url()Checks and cleans a URL.
• sanitize_title()Sanitizes a string into a slug, which can be used in URLs or HTML attributes.
• wp_get_update_php_url()Gets the URL to learn more about updating the PHP version the site is running on.
• wp_get_update_php_annotation()Returns the default annotation for the web hosting altering the "Update PHP" page URL.
• wp_nonce_field()Retrieves or display nonce hidden field for forms.
• esc_attr()Escaping for HTML attributes.
• submit_button()Echoes a submit button, with provided text and appropriate class(es).

Used by · 2

• core_upgrade_preamble()Display upgrade WordPress for downloading latest or upgrading automatically form.
• dismissed_updates()Display dismissed updates.

Source code

View on Trac ↗View on GitHub ↗

36function list_core_update( $update ) {37	global $wp_local_package, $wpdb;38	static $first_pass = true;39 40	$wp_version     = wp_get_wp_version();41	$version_string = sprintf( '%s&ndash;%s', $update->current, get_locale() );42 43	if ( 'en_US' === $update->locale && 'en_US' === get_locale() ) {44		$version_string = $update->current;45	} elseif ( 'en_US' === $update->locale && $update->packages->partial && $wp_version === $update->partial_version ) {46		$updates = get_core_updates();47		if ( $updates && 1 === count( $updates ) ) {48			// If the only available update is a partial builds, it doesn't need a language-specific version string.49			$version_string = $update->current;50		}51	} elseif ( 'en_US' === $update->locale && 'en_US' !== get_locale() ) {52		$version_string = sprintf( '%s&ndash;%s', $update->current, $update->locale );53	}54 55	$current = false;56	if ( ! isset( $update->response ) || 'latest' === $update->response ) {57		$current = true;58	}59 60	$message       = '';61	$form_action   = 'update-core.php?action=do-core-upgrade';62	$php_version   = PHP_VERSION;63	$mysql_version = $wpdb->db_version();64	$show_buttons  = true;65 66	// Nightly build versions have two hyphens and a commit number.67	if ( preg_match( '/-\w+-\d+/', $update->current ) ) {68		// Retrieve the major version number.69		preg_match( '/^\d+.\d+/', $update->current, $update_major );70		/* translators: %s: WordPress version. */71		$submit = sprintf( __( 'Update to latest %s nightly' ), $update_major[0] );72	} else {73		/* translators: %s: WordPress version. */74		$submit = sprintf( __( 'Update to version %s' ), $version_string );75	}76 77	if ( 'development' === $update->response ) {78		$message = __( 'You can update to the latest nightly build manually:' );79	} else {80		if ( $current ) {81			/* translators: %s: WordPress version. */82			$submit      = sprintf( __( 'Re-install version %s' ), $version_string );83			$form_action = 'update-core.php?action=do-core-reinstall';84		} else {85			$php_compat = version_compare( $php_version, $update->php_version, '>=' );86			if ( file_exists( WP_CONTENT_DIR . '/db.php' ) && empty( $wpdb->is_mysql ) ) {87				$mysql_compat = true;88			} else {89				$mysql_compat = version_compare( $mysql_version, $update->mysql_version, '>=' );90			}91 92			$version_url = sprintf(93				/* translators: %s: WordPress version. */94				esc_url( __( 'https://wordpress.org/documentation/wordpress-version/version-%s/' ) ),95				sanitize_title( $update->current )96			);97 98			$php_update_message = '</p><p>' . sprintf(99				/* translators: %s: URL to Update PHP page. */100				__( '<a href="%s">Learn more about updating PHP</a>.' ),101				esc_url( wp_get_update_php_url() )102			);103 104			$annotation = wp_get_update_php_annotation();105 106			if ( $annotation ) {107				$php_update_message .= '</p><p><em>' . $annotation . '</em>';108			}109 110			if ( ! $mysql_compat && ! $php_compat ) {111				$message = sprintf(112					/* translators: 1: URL to WordPress release notes, 2: WordPress version number, 3: Minimum required PHP version number, 4: Minimum required MySQL version number, 5: Current PHP version number, 6: Current MySQL version number. */113					__( 'You cannot update because <a href="%1$s">WordPress %2$s</a> requires PHP version %3$s or higher and MySQL version %4$s or higher. You are running PHP version %5$s and MySQL version %6$s.' ),114					$version_url,115					$update->current,

Changelog

Introduced in 2.7.0. 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 6.8.8 tag, from src/wp-admin/update-core.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.

Corrections

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