PHP Script Runs out of memory - php

Question

My PHP code is supposed to generate 1000 random words with a random length between 3 and 7 chars. And then it is supposed to compare each word to all the words in my dictionary, engmix.txt, and place the matches into an array and all the nonmatches into another array. I know the code functions correctly, but it runs out of memory on both computers that I have tried running it on. I am using XAMPP as my webserver and even tested removing the memory limit to see if it would run. I would like advice on how to optimize this code.
<?php
ini_set('memory_limit', '-1');
function getRandomWord($len = 10) {
$word = range('a', 'z');
shuffle($word);
return substr(implode($word), 0, $len);
}
$words = array();
for ($i = 0; $i < 300; $i++) {
$words[$i] = getRandomWord(rand(3, 7));
}
$matches = array();
$nonmatches = array();
$k = 0;
$dictionary = file("engmix.txt");
for ($i=0; $i < count($dictionary); $i++) {
for ($j = 0; $j < count($words); $j++) {
if ($dictionary[$i] == $words[$j]) {
$matches[$k] = $words[$j];
$k++;
} else {
$nonmatches[$k] = $words[$j];
$k++;
}
}
}
?>
New fixed code:
<?php
function getRandomWord($len = 10) {
$word = range('a', 'z');
shuffle($word);
return substr(implode($word), 0, $len);
}
$words = array();
for ($i = 0; $i < 300; $i++) {
$words[$i] = getRandomWord(rand(3, 7));
}
$matches = array();
$nonmatches = array();
$file = file("engmix.txt");
$i = 0;
$file_handle = fopen("engmix.txt", "r");
while (!feof($file_handle)) {
$line = fgets($file_handle);
$line = str_replace("\n", "", $line);
$line = str_replace("\r", "", $line);
for ($i = 0; $i < count($words); $i++) {
if ($line == $words[$i]) {
$matches[] = $words[$i];
}
}
}
fclose($file_handle);
$nonmatches = array_diff($words, $file);
print("<pre>");
print_r($matches);
print("<pre>");
print("<pre>");
print_r($nonmatches);
print("<pre>");
?>