Pseudo-random number

<?php
$seed = "a james";

//compile list of prime numbers (2 - 104729)
$fh = fopen("primes.txt", 'r');
for($j = 0; $j < 10000; $j++){
  $primes[$j] = trim(fgets($fh));
}

//Create pseudo random number for each character in the seed
$len = strlen($seed);
for($i = 1; $i < $len+1; $i++){
  //number = absoluteValueOf(decimalValueOfCharacter ^ (characterPosition (mod 6) + 1) (mod 104730) + 1); 104730 is 1 greater than the 10000th prime.
  //It's not very random, but it will do.
  $str[$i] = abs((pow(ord($seed[$i-1]), ($i%6)+1)%104730) + 1);
  $j = $i;
}

//display each pseudo random number for each character in the seed
foreach($str as $echo){
  echo "$echo ";
}

echo "<br />";

//find the closest prime number to each of the pseudo random numbers
for($i = 1; $i <= $j; $i++){
  $dist = 104729;
  foreach($primes as $test){
    if(abs($test - $str[$i]) < $dist){
      $dist = abs($test - $str[$i]);
      $primeRelation[$i] = $test;
    }else{
      break 1;
    }
  }
}

//display each of the closest primes
foreach($primeRelation as $echo){
  echo "$echo ";
}
?>