Question

wp_should_upgrade_global_tables()

Determine if global tables should be upgraded.

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description

This function performs a series of checks to ensure the environment allows for the safe upgrading of global WordPress database tables. It is necessary because global tables will commonly grow to millions of rows on large installations, and the ability to control their upgrade routines can be critical to the operation of large networks.

In a future iteration, this function may use wp_is_large_network() to more- intelligently prevent global table upgrades. Until then, we make sure WordPress is on the main site of the main network, to avoid running queries more than once in multi-site or multi-network environments.

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返回值

(bool) Whether to run the upgrade routines on global tables.

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源代码

File: wp-admin/includes/upgrade.php

function wp_should_upgrade_global_tables() {

	// Return false early if explicitly not upgrading
	if ( defined( 'DO_NOT_UPGRADE_GLOBAL_TABLES' ) ) {
		return false;
	}

	// Assume global tables should be upgraded
	$should_upgrade = true;

	// Set to false if not on main network (does not matter if not multi-network)
	if ( ! is_main_network() ) {
		$should_upgrade = false;
	}

	// Set to false if not on main site of current network (does not matter if not multi-site)
	if ( ! is_main_site() ) {
		$should_upgrade = false;
	}

	/**
	 * Filters if upgrade routines should be run on global tables.
	 *
	 * @param bool $should_upgrade Whether to run the upgrade routines on global tables.
	 */
	return apply_filters( 'wp_should_upgrade_global_tables', $should_upgrade );
}

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更新日志

Version	description
4.3.0	Introduced.

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相关函数

Uses

• wp-admin/includes/upgrade.php: wp_should_upgrade_global_tables
• wp-includes/functions.php: is_main_network()
• wp-includes/functions.php: is_main_site()
• wp-includes/plugin.php: apply_filters()

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Used By

• wp-admin/includes/upgrade.php: pre_schema_upgrade()
• wp-admin/includes/upgrade.php: upgrade_network()
• wp-admin/includes/upgrade.php: dbDelta()

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User Contributed Notes