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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 539 | if ( !is_subdomain_install() && $wpdb->get_var( $wpdb->prepare( "SELECT post_name FROM " . $wpdb->get_blog_prefix( $current_site->blog_id ) . "posts WHERE post_type = 'page' AND post_name = %s", $blogname ) ) ) |
| 540 | $errors->add( 'blogname', __( 'Sorry, you may not use that site name.' ) ); |
| 541 | |
| 542 | // all numeric? |
| 543 | $match = array(); |
| 544 | preg_match( '/[0-9]*/', $blogname, $match ); |
| 545 | if ( $match[0] == $blogname ) |
| 546 | $errors->add('blogname', __('Sorry, site names must have letters too!')); |
| 547 | |
| 548 | $blogname = apply_filters( 'newblogname', $blogname ); |
| 549 | |
| 550 | $blog_title = stripslashes( $blog_title ); |
| 551 | |
| 552 | if ( empty( $blog_title ) ) |
| 553 | $errors->add('blog_title', __('Please enter a site title')); |
| 554 | |
| 555 | // Check if the domain/path has been used already. |
| 556 | if ( is_subdomain_install() ) { |
| 557 | $mydomain = $blogname . '.' . preg_replace( '|^www\.|', '', $domain ); |