validate_current_theme(): bool

Description

Compatibility

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

Return value

bool

Performance profile

How much work a call to validate_current_theme() 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

4–71

Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 79.

Plugin surface

1 hook

Third-party callbacks on 'validate_current_theme' run inside this call, and their cost is not bounded by anything here.

Called by

1

1 place in core call this, so the cost is paid more often than your own code shows.

What it touches

• hookthird-party callbacksapply_filters()called directly
• filesystemfilesystem accessfile_exists()called directly
• optionoption read or writeupdate_option()one call below validate_current_theme()

Further down the call graph this can also reach serialize, cache, transient 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 · 32 distinct outcomes

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

Hooks and filters fired · 1

One hook fires while validate_current_theme() runs, in this order:

1. 1
   apply_filters( validate_current_theme )filterline 906 (+8 into the body)

   Filters whether to validate the active theme.

Uses · 9

• wp_installing()Checks or sets whether WordPress is in "installation" mode.
• apply_filters()Calls the callback functions that have been added to a filter hook.
• get_template_directory()Retrieves template directory path for the active theme.
• is_child_theme()Whether a child theme is in use.
• get_stylesheet_directory()Retrieves stylesheet directory path for the active theme.
• wp_get_theme()Gets a WP_Theme object for a theme.
• switch_theme()Switches the theme.
• get_stylesheet()Retrieves name of the current stylesheet.
• WP_Theme::get_core_default_theme()Determines the latest WordPress default theme that is installed.

Used by · 1

• WP_Customize_Manager::after_setup_theme()Callback to validate a theme once it is loaded

Source code

View on Trac ↗View on GitHub ↗

898function validate_current_theme() {899	/**900	 * Filters whether to validate the active theme.901	 *902	 * @since 2.7.0903	 *904	 * @param bool $validate Whether to validate the active theme. Default true.905	 */906	if ( wp_installing() || ! apply_filters( 'validate_current_theme', true ) ) {907		return true;908	}909 910	if (911		! file_exists( get_template_directory() . '/templates/index.html' )912		&& ! file_exists( get_template_directory() . '/block-templates/index.html' ) // Deprecated path support since 5.9.0.913		&& ! file_exists( get_template_directory() . '/index.php' )914	) {915		// Invalid.916	} elseif ( ! file_exists( get_template_directory() . '/style.css' ) ) {917		// Invalid.918	} elseif ( is_child_theme() && ! file_exists( get_stylesheet_directory() . '/style.css' ) ) {919		// Invalid.920	} else {921		// Valid.922		return true;923	}924 925	$default = wp_get_theme( WP_DEFAULT_THEME );926	if ( $default->exists() ) {927		switch_theme( WP_DEFAULT_THEME );928		return false;929	}930 931	/**932	 * If we're in an invalid state but WP_DEFAULT_THEME doesn't exist,933	 * switch to the latest core default theme that's installed.934	 *935	 * If it turns out that this latest core default theme is our current936	 * theme, then there's nothing we can do about that, so we have to bail,937	 * rather than going into an infinite loop. (This is why there are938	 * checks against WP_DEFAULT_THEME above, also.) We also can't do anything939	 * if it turns out there is no default theme installed. (That's `false`.)940	 */941	$default = WP_Theme::get_core_default_theme();942	if ( false === $default || get_stylesheet() === $default->get_stylesheet() ) {943		return true;944	}945 946	switch_theme( $default->get_stylesheet() );947	return false;948}

Changelog

Introduced in 1.5.0. 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 7.0.4 tag, from src/wp-includes/theme.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.

Corrections

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