generate random alphanum codes

generate-codes.php

<?php

$codes = array();

function generateCode(){
	
	global $codes;

	$chars = "azertyupqsdfghjklmwxcvbn23456789";
	$charsCount = strlen($chars) - 1;

	$countCode = 8;
	$code = "";

	for($i = 0 ; $i < $countCode ; $i++){
		$rdm = rand(0,$charsCount);

		$code .= $chars{$rdm};

	}

	if(isset($codes[$code])){
		generateCode();
	}else{
		$codes[$code] = 1;
	}

}

$totalCodes = 5000;

for($i = 0 ; $i < $totalCodes ; $i++){
	generateCode();
}

foreach($codes as $k=>$v){
	echo($k) . PHP_EOL;
}