隨機生成4位數字驗證碼

<?php session_start(); srand((double)microtime()*1000000); while(($authnum=rand()%10000)<1000);//生成四位隨機整數驗證碼 $_SESSION['auth']=$authnum; //生成驗證碼圖片 Header("Content-type: image/PNG"); $im = imagecre

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