Replace invalid use of ltrim() in attachment_url_to_postid() with substr().

props bradyvercher.
fixes #30346.
Built from https://develop.svn.wordpress.org/trunk@30501


git-svn-id: http://core.svn.wordpress.org/trunk@30490 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/media.php

@@ -3269,7 +3269,11 @@ function attachment_url_to_postid( $url ) {
 	global $wpdb;
 
 	$dir = wp_upload_dir();
-	$path = ltrim( $url, $dir['baseurl'] . '/' );
+	$path = $url;
+
+	if ( 0 === strpos( $path, $dir['baseurl'] . '/' ) ) {
+		$path = substr( $path, strlen( $dir['baseurl'] . '/' ) );
+	}
 
 	$sql = $wpdb->prepare(
 		"SELECT post_id FROM $wpdb->postmeta WHERE meta_key = '_wp_attached_file' AND meta_value = %s",

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.1-beta2-30500';
+$wp_version = '4.1-beta2-30501';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.