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Description

Get a blog's numeric ID from its URL.

On a subdirectory installation like example.com/blog1/, $domain will be the root 'example.com' and $path the subdirectory '/blog1/'. With subdomains like blog1.example.com, $domain is 'blog1.example.com' and $path is '/'.

Usage

$int = get_blog_id_from_url( $domain, $path );

Parameters

$domain

( string ) required –

$path

( string ) optional default: / – Optional. Not required for subdomain installations.

Returns

int

1. if no blog found, otherwise the ID of the matching blog

Source

File name: wordpress/wp-includes/ms-functions.php
Lines:

1 to 30 of 30

function get_blog_id_from_url( $domain, $path = '/' ) {
  $domain = strtolower( $domain );
  $path   = strtolower( $path );
  $id     = wp_cache_get( md5( $domain . $path ), 'blog-id-cache' );

  if ( -1 == $id ) { // Blog does not exist.
    return 0;
  } elseif ( $id ) {
    return (int) $id;
  }

  $args   = array(
    'domain'                 => $domain,
    'path'                   => $path,
    'fields'                 => 'ids',
    'number'                 => 1,
    'update_site_meta_cache' => false,
  );
  $result = get_sites( $args );
  $id     = array_shift( $result );

  if ( ! $id ) {
    wp_cache_set( md5( $domain . $path ), -1, 'blog-id-cache' );
    return 0;
  }

  wp_cache_set( md5( $domain . $path ), $id, 'blog-id-cache' );

  return $id;
}
 

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