What potential pitfalls should be avoided when generating random values in a PHP matrix?

One potential pitfall when generating random values in a PHP matrix is the possibility of duplicate values occurring within the matrix. To avoid this issue, you can keep track of the values that have already been generated and ensure that each new value is unique. 

<?php
$rows = 3;
$cols = 3;
$matrix = [];

$values = range(1, $rows * $cols);
shuffle($values);

for ($i = 0; $i < $rows; $i++) {
    for ($j = 0; $j < $cols; $j++) {
        $matrix[$i][$j] = array_pop($values);
    }
}

print_r($matrix);
?>

Keywords

rand mt_rand array_rand shuffle seed

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