is_preview() WP 1.0

Is the query for a post or page preview?

No Hooks.

Return

true/false.

Usage

is_preview();

Code of is_preview: wp-includes/query.php ^{VER 4.9.8}

<?php
function is_preview() {
	global $wp_query;

	if ( ! isset( $wp_query ) ) {
		_doing_it_wrong( __FUNCTION__, __( 'Conditional query tags do not work before the query is run. Before then, they always return false.' ), '3.1.0' );
		return false;
	}

	return $wp_query->is_preview();
}

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