WordPress at a glance
function is not described

wp_cache_get_postid_from_comment() WPSCache 1.0

No Hooks.

Return

null. Nothing.

Usage

wp_cache_get_postid_from_comment( $comment_id, $status );
$comment_id (required)
-
$status **
-
Default: 'NA'

Code of wp_cache_get_postid_from_comment() WPSCache 1.7.3

<?php
function wp_cache_get_postid_from_comment( $comment_id, $status = 'NA' ) {
	global $super_cache_enabled, $wp_cache_request_uri;

	if ( defined( 'DONOTDELETECACHE' ) ) {
		return;
	}

	// Check is it "Empty Spam" or "Empty Trash"
	if ( isset( $GLOBALS[ 'pagenow' ] ) && $GLOBALS[ 'pagenow' ] === 'edit-comments.php' &&
		( isset( $_REQUEST['delete_all'] ) || isset( $_REQUEST['delete_all2'] ) )
	) {
		wp_cache_debug( "Delete all SPAM or Trash comments. Don't delete any cache files.", 4 );
		define( 'DONOTDELETECACHE', 1 );
		return;
	}

	$comment = get_comment($comment_id, ARRAY_A);
	if ( $status != 'NA' ) {
		$comment[ 'old_comment_approved' ] = $comment[ 'comment_approved' ];
		$comment[ 'comment_approved' ] = $status;
	}

	if ( ( $status == 'trash' || $status == 'spam' ) && $comment[ 'old_comment_approved' ] != 1 ) {
		// don't modify cache if moderated comments are trashed or spammed
		wp_cache_debug( "Moderated comment deleted or spammed. Don't delete any cache files.", 4 );
		define( 'DONOTDELETECACHE', 1 );
		return wp_cache_post_id();
	}
	$postid = isset( $comment[ 'comment_post_ID' ] ) ? (int) $comment[ 'comment_post_ID' ] : 0;
	// Do nothing if comment is not moderated
	// http://ocaoimh.ie/2006/12/05/caching-wordpress-with-wp-cache-in-a-spam-filled-world
	if ( !preg_match('/wp-admin\//', $wp_cache_request_uri) ) {
		if ( $comment['comment_approved'] == 'delete' && ( isset( $comment[ 'old_comment_approved' ] ) && $comment[ 'old_comment_approved' ] == 0 ) ) { // do nothing if moderated comments are deleted
			wp_cache_debug( "Moderated comment deleted. Don't delete any cache files.", 4 );
			define( 'DONOTDELETECACHE', 1 );
			return $postid;
		} elseif ( $comment['comment_approved'] == 'spam' ) {
			wp_cache_debug( "Spam comment. Don't delete any cache files.", 4 );
			define( 'DONOTDELETECACHE', 1 );
			return $postid;
		} elseif( $comment['comment_approved'] == '0' ) {
			if ( $comment[ 'comment_type' ] == '' ) {
				wp_cache_debug( "Moderated comment. Don't delete supercache file until comment approved.", 4 );
				$super_cache_enabled = 0; // don't remove the super cache static file until comment is approved
				define( 'DONOTDELETECACHE', 1 );
			} else {
				wp_cache_debug( 'Moderated ping or trackback. Not deleting cache files..', 4 );
				define( 'DONOTDELETECACHE', 1 );
				return $postid;
			}
		}
	}
	// We must check it up again due to WP bugs calling two different actions
	// for delete, for example both wp_set_comment_status and delete_comment
	// are called when deleting a comment
	if ($postid > 0)  {
		wp_cache_debug( "Post $postid changed. Update cache.", 4 );
		return wp_cache_post_change( $postid );
	} else {
		wp_cache_debug( 'Unknown post changed. Update cache.', 4 );
		return wp_cache_post_change( wp_cache_post_id() );
	}
}