Something

<?php
include("../include/session.php");

function populateKeywords(){
		$time = microtime();
		$f = array('\\', '\'','\"','.',',','!','?',':','(',')','*'); //set array of characters to replace
		$r = array('\\\\', '\\\'','\\\"','','','','','','','',''); //set array of characters to replace with
	$query = mysql_query("select aid,title,summary,body from articles"); //query for aid,title,summary,body
	while($article = mysql_fetch_array($query)){ //$article
		$exists = FALSE; //set duplicate word exist to false
		$words = array(); //create word array
		$words = explode(" ",$article['title']); //add all words from the article title
		$words .= explode(" ",$article['summary']); //add all words from the article summary
		$words .= explode(" ",$article['body']); //add all words from the article body
		for($i=0;$i<count($words);$i++){ //iterate through the words
			if(strlen($words[$i])>3){ //if the length of word $i is great than 3, continue
			$word = strtolower($words[$i]); //set $word to lowercase
			$word = str_replace($f,$r,$word); //replace $f with $r
				$query2 = mysql_query("select word from searchWords where articleIds=".(int)$article['aid']); //query for word(s)
				while($word_check = mysql_fetch_array($query2)){ //iterate through all indexed words
					if(strcmp($word_check['word'],$word)==0){ //if indexed word is equal to the currently selected word
						$exists = TRUE; //set duplicate exists to TRUE
					} //end if
				} //end while
				if(!$exists){ //check if exists is TRUE
					mysql_query("INSERT INTO searchWords VALUES (0, '".$word."',".(int)$article['aid'].")") or die(mysql_error()); //insert new word,aid into table
				}
			} //end check if exists
		} //end for loop
		unset($words);
		unset($article);
	}
	print "Successful!";
	print microtime() - $time;
}

populateKeywords();
?>