3v4l.org

run code in 300+ PHP versions simultaneously
<?php $chars = "a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z"; $chars2 = "0,1,2,3,4,5,6,7,8,9"; $arrayChars = explode("," , $chars); $arrayNumbers = explode("," , $chars2); $result = array_merge(array_rand(array_flip($arrayChars) , 3) , array_rand(array_flip($arrayNumbers) , 3)); shuffle($result); var_dump($result);

preferences:
22.67 ms | 409 KiB | 5 Q