mysql - PHP loop creating duplicate database rows -


i'm playing creating database contains plaintext , hash values combination of passwords, when added database end many duplicates before moves on next combination... ideas why , how stop it?

<?php $con=mysqli_connect("localhost","root","","test"); // check connection if (mysqli_connect_errno()) {     echo "failed connect mysql: " . mysqli_connect_error(); }  $numberof=0; $alphabet = array("a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z");  for($i=0; $i<count($alphabet); $i++){     for($j=0; $j<count($alphabet); $j++){         for($k=0; $k<count($alphabet); $k++){             for($l=0; $l<count($alphabet); $l++){                 $final = $alphabet[$i].$alphabet[$j].$alphabet[$k];                 $hash = md5($final);                  mysqli_query($con,"insert hashes (plain, hash) values ('$final', '$hash')");             }         }     } } echo $numberof; ?>

you have 4 nested for loops, counters $i $j $k , $l. however, final string use in query uses $i $j , $k you'll have 26 duplicates. assume meant append value of $l end of string?


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