문자 or 숫자 랜덤 생성
if(date("s")%2 ==0){$imgStr = mt_rand(1,9).mt_rand(1,9).mt_rand(1,9).mt_rand(1,9).mt_rand(1,9).mt_rand(1,9);}else{//$imgStr = chr(rand()%26+65).chr(rand()%26+65).chr(rand()%26+65).chr(rand()%26+65).chr(rand()%26+65).chr(rand()%26+65);$imgStr = mt_rand(1,9).mt_rand(1,9).mt_rand(1,9).mt_rand(1,9).mt_rand(1,9).mt_rand(1,9);}
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