private static function mutate($indiv)
{
// Loop through genes
for ($i = 0; $i < $indiv->size(); $i++) {
if (algorithm::random() <= algorithm::$mutationRate) {
$gene = individual::$characters[rand(0, strlen(individual::$characters) - 1)];
// Create random gene
$indiv->setGene($i, $gene);
//substitute the gene into the individual
}
}
}
