February 12, 2011 
Definition:
function get_blog_details( $fields, $get_all = true ) {}
Retrieve the details for a blog from the blogs table and blog options.
Parameters
- int|string|array $fields: A blog ID, a blog name, or an array of fields to query against.
- bool $get_all: Whether to retrieve all details or only the details in the blogs table. Default is true.
Return values
returns:details.
Defined filters
- blog_details
apply_filters( 'blog_details', $details )
Source code
function get_blog_details( $fields, $get_all = true ) {
global $wpdb;
if ( is_array($fields ) ) {
if ( isset($fields['blog_id']) ) {
$blog_id = $fields['blog_id'];
} elseif ( isset($fields['domain']) && isset($fields['path']) ) {
$key = md5( $fields['domain'] . $fields['path'] );
$blog = wp_cache_get($key, 'blog-lookup');
if ( false !== $blog )
return $blog;
if ( substr( $fields['domain'], 0, 4 ) == 'www.' ) {
$nowww = substr( $fields['domain'], 4 );
$blog = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM $wpdb->blogs WHERE domain IN (%s,%s) AND path = %s ORDER BY CHAR_LENGTH(domain) DESC", $nowww, $fields['domain'], $fields['path'] ) );
} else {
$blog = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM $wpdb->blogs WHERE domain = %s AND path = %s", $fields['domain'], $fields['path'] ) );
}
if ( $blog ) {
wp_cache_set($blog->blog_id . 'short', $blog, 'blog-details');
$blog_id = $blog->blog_id;
} else {
return false;
}
} elseif ( isset($fields['domain']) && is_subdomain_install() ) {
$key = md5( $fields['domain'] );
$blog = wp_cache_get($key, 'blog-lookup');
if ( false !== $blog )
return $blog;
if ( substr( $fields['domain'], 0, 4 ) == 'www.' ) {
$nowww = substr( $fields['domain'], 4 );
$blog = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM $wpdb->blogs WHERE domain IN (%s,%s) ORDER BY CHAR_LENGTH(domain) DESC", $nowww, $fields['domain'] ) );
} else {
$blog = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM $wpdb->blogs WHERE domain = %s", $fields['domain'] ) );
}
if ( $blog ) {
wp_cache_set($blog->blog_id . 'short', $blog, 'blog-details');
$blog_id = $blog->blog_id;
} else {
return false;
}
} else {
return false;
}
} else {
if ( !is_numeric( $fields ) )
$blog_id = get_id_from_blogname( $fields );
else
$blog_id = $fields;
}
$blog_id = (int) $blog_id;
$all = $get_all == true ? '' : 'short';
$details = wp_cache_get( $blog_id . $all, 'blog-details' );
if ( $details ) {
if ( ! is_object( $details ) ) {
if ( $details == -1 ) {
return false;
} else {
// Clear old pre-serialized objects. Cache clients do better with that.
wp_cache_delete( $blog_id . $all, 'blog-details' );
unset($details);
}
} else {
return $details;
}
}
// Try the other cache.
if ( $get_all ) {
$details = wp_cache_get( $blog_id . 'short', 'blog-details' );
} else {
$details = wp_cache_get( $blog_id, 'blog-details' );
// If short was requested and full cache is set, we can return.
if ( $details ) {
if ( ! is_object( $details ) ) {
if ( $details == -1 ) {
return false;
} else {
// Clear old pre-serialized objects. Cache clients do better with that.
wp_cache_delete( $blog_id, 'blog-details' );
unset($details);
}
} else {
return $details;
}
}
}
if ( empty($details) ) {
$details = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM $wpdb->blogs WHERE blog_id = %d /* get_blog_details */", $blog_id ) );
if ( ! $details ) {
// Set the full cache.
wp_cache_set( $blog_id, -1, 'blog-details' );
return false;
}
}
if ( ! $get_all ) {
wp_cache_set( $blog_id . $all, $details, 'blog-details' );
return $details;
}
$details->blogname = get_blog_option( $blog_id, 'blogname' );
$details->siteurl = get_blog_option( $blog_id, 'siteurl' );
$details->post_count = get_blog_option( $blog_id, 'post_count' );
$details = apply_filters( 'blog_details', $details );
wp_cache_set( $blog_id . $all, $details, 'blog-details' );
$key = md5( $details->domain . $details->path );
wp_cache_set( $key, $details, 'blog-lookup' );
return $details;
}
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A HitchHackers guide through WordPress 
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