From 64504279d0fd66bfe340f52d08980b7d845413d0 Mon Sep 17 00:00:00 2001
From: Jeroen De Dauw <jeroendedauw@users.mediawiki.org>
Date: Wed, 15 Feb 2012 19:39:42 +0000
Subject: [PATCH] follow up to r111468 - put in compatibility for php 5.2 using
 debug_backtrace hack

---
 includes/DBTable.php | 33 ++++++++++++++++++++++++++++++++-
 1 file changed, 32 insertions(+), 1 deletion(-)

diff --git a/includes/DBTable.php b/includes/DBTable.php
index ea627eb09f..ff29ab4f39 100644
--- a/includes/DBTable.php
+++ b/includes/DBTable.php
@@ -540,12 +540,43 @@ abstract class DBTable {
 		static $instance;
 		
 		if ( !isset( $instance ) ) {
-			$instance = new static;
+			$class = function_exists( 'get_called_class' ) ? get_called_class() : self::get_called_class();
+			$instance = new $class;
 		}
 		
 		return $instance;
 	}
 
+	/**
+	 * Compatibility fallback function so the singleton method works on PHP < 5.3.
+	 * Code borrowed from http://www.php.net/manual/en/function.get-called-class.php#107445
+	 *
+	 * @since 1.20
+	 *
+	 * @return string
+	 */
+	protected static function get_called_class() {
+		$bt = debug_backtrace();
+		$l = count($bt) - 1;
+		$matches = array();
+		while(empty($matches) && $l > -1){
+			$lines = file($bt[$l]['file']);
+			$callerLine = $lines[$bt[$l]['line']-1];
+			preg_match('/([a-zA-Z0-9\_]+)::'.$bt[$l--]['function'].'/',
+				$callerLine,
+				$matches);
+		}
+		if (!isset($matches[1])) $matches[1]=NULL; //for notices
+		if ($matches[1] == 'self') {
+			$line = $bt[$l]['line']-1;
+			while ($line > 0 && strpos($lines[$line], 'class') === false) {
+				$line--;
+			}
+			preg_match('/class[\s]+(.+?)[\s]+/si', $lines[$line], $matches);
+		}
+		return $matches[1];
+	}
+
 	/**
 	 * Get an array with fields from a database result,
 	 * that can be fed directly to the constructor or
-- 
2.20.1