wp_installing( bool $is_installing = null ): bool

Checks or sets whether WordPress is in “installation” mode.


If the WP_INSTALLING constant is defined during the bootstrap, wp_installing() will default to true.

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$is_installing bool Optional
True to set WP into Installing mode, false to turn Installing mode off.
Omit this parameter if you only want to fetch the current status.

Default: null

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bool True if WP is installing, otherwise false. When a $is_installing is passed, the function will report whether WP was in installing mode prior to the change to $is_installing.

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File: wp-includes/load.php. View all references

function wp_installing( $is_installing = null ) {
	static $installing = null;

	// Support for the `WP_INSTALLING` constant, defined before WP is loaded.
	if ( is_null( $installing ) ) {
		$installing = defined( 'WP_INSTALLING' ) && WP_INSTALLING;

	if ( ! is_null( $is_installing ) ) {
		$old_installing = $installing;
		$installing     = $is_installing;

		return (bool) $old_installing;

	return (bool) $installing;

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Version Description
4.4.0 Introduced.

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