<?PHP
function searchFromEnd($filename,$search){
	//first make sure that the file is there, and we can read it
	if(file_exists($filename) && is_readable($filename)){ 
		//open the file for reading
		$fp = fopen($filename,'r');
		//get the length of the search string(minus the first character)
		$size=strlen($search)-1; 
		//get first element in string
		$first=$search[0]; 
		//size of the file
		$file_size=filesize($filename); 
		//set seek pointer to end of the file - size of the string
		$seek=$file_size-$size; 
		//set found to FALSE
		$found=false;
		//while not past the begining of the file
		while($seek>=0){
			//set file pointer to seek value
			fseek($fp,$seek); 
			//read in the first byte from pointer
            $test=fread($fp,1); 
            //if byte is same as the first string character, and  back far enough in file for search length
			if($test==$first && (($seek+$size) <= $file_size) ){ 
				//append enough characters to $test to make it same size as $search
				$test.=fread($fp,$size); 
				//if test value is what we're looking for
				if(strcmp($test,$search)==0){ 
					//return position;
					$found=$seek;
					//set pointer to -1 (exit loop);
					$seek=-1; 
				}else{
					//move back a byte
					$seek--; 
				}
			}else{
				//move back a byte
				$seek--; 
			}
		}
		//close the file
		fclose($fp); 
	}
	//return FALSE or position of search string
	return $found; 
}
?>