allow_subdirectory_install(): bool

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

Whether subdirectory installation is allowed

Performance profile

How much work a call to allow_subdirectory_install() 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

Reaches the database via ->get_row().

Scaling

Constant

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

Instructions

7–21

Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 24.

Plugin surface

1 hook

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

Called by

2

2 places 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
• sqldatabase query->get_row()called directly

What one call costs · 2 distinct outcomes

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

Hooks and filters fired · 1

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

1. 1
   apply_filters( allow_subdirectory_install )filterline 65 (+11 into the body)

   Filters whether to enable the subdirectory installation feature in Multisite.

Uses · 1

• apply_filters()Calls the callback functions that have been added to a filter hook.

Used by · 2

• network_step1()Prints step 1 for Network installation process.
• network_step2()Prints step 2 for Network installation process.

Source code

View on Trac ↗View on GitHub ↗

54function allow_subdirectory_install() {55	global $wpdb;56 57	/**58	 * Filters whether to enable the subdirectory installation feature in Multisite.59	 *60	 * @since 3.0.061	 *62	 * @param bool $allow Whether to enable the subdirectory installation feature in Multisite.63	 *                    Default false.64	 */65	if ( apply_filters( 'allow_subdirectory_install', false ) ) {66		return true;67	}68 69	if ( defined( 'ALLOW_SUBDIRECTORY_INSTALL' ) && ALLOW_SUBDIRECTORY_INSTALL ) {70		return true;71	}72 73	$post = $wpdb->get_row( "SELECT ID FROM $wpdb->posts WHERE post_date < DATE_SUB(NOW(), INTERVAL 1 MONTH) AND post_status = 'publish'" );74	if ( empty( $post ) ) {75		return true;76	}77 78	return false;79}

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-admin/includes/network.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.

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