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131.91 ms | 1399 KiB | 7 Q<?php
$length = 12;
$chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890';
{
$chars_length = (strlen($chars) - 1);
$string = $chars{rand(0, $chars_length)};
for ($i = 1; $i < $length; $i = strlen($string))
{
$r = $chars{rand(0, $chars_length)};
if ($r != $string{$i - 1})
{
$string .= $r;
}
}
echo $string;
}