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@ 2017-07-08T19:45:40Z

<?php 
$array = '0123456789ABCDEFG'; 
$s = ''; 
for ($i = 1; $i < 50; $i++) { 
$s .= $array[rand(0,strlen ($array) - 1)];
} 
echo $s;

Output
Performance
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rand: documentation ( source)

preferences:dark modelive preview

34.78 ms | 402 KiB | 5 Q