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這篇文章主要介紹了php中如何使用rand()函數(shù),具有一定借鑒價值,感興趣的朋友可以參考下,希望大家閱讀完這篇文章之后大有收獲,下面讓小編帶著大家一起了解一下。
@session_start(); $currentTime = time(); $changeTime = 10; $rand = ''; if(isset($_SESSION['time'])) { if(($currentTime - $_SESSION['time']) >= $changeTime) { $_SESSION['time'] = $currentTime; $rand = (0, 9999); $_SESSION['rand'] = $rand; }else{ $rand = $_SESSION['rand']; } }else{ $_SESSION['time'] = $currentTime; $rand = (0, 9999); $_SESSION['rand'] = $rand; } <?php session_start(); function _rand($_i){ $currentTime = time(); $changeTime = 10; $rand = ''; if(isset($_SESSION['time'][$_i])){ if(($currentTime - $_SESSION['time'][$_i]) >= $changeTime) { switch ($_i){ case '0': $_SESSION['rand'][$_i] = mt_rand(100,200); $rand = $_SESSION['rand'][$_i]; break; case '1': $_SESSION['rand'][$_i] = mt_rand(200,300); $rand = $_SESSION['rand'][$_i]; break; case '2': $_SESSION['rand'][$_i] = mt_rand(300,400); $rand = $_SESSION['rand'][$_i]; break; } $_SESSION['time'][$_i] = $currentTime; }else{ switch ($_i){ case '0': $rand = $_SESSION['rand'][$_i]; break; case '1': $rand = $_SESSION['rand'][$_i]; break; case '2': $rand = $_SESSION['rand'][$_i]; break; } } }else{ if(!isset($_SESSION['time'])){ $_SESSION['time'] = array(); } switch ($_i){ case '0': $_SESSION['rand'][$_i] = mt_rand(100,200); $rand = $_SESSION['rand'][$_i]; break; case '1': $_SESSION['rand'][$_i] = mt_rand(200,300); $rand = $_SESSION['rand'][$_i]; break; case '2': $_SESSION['rand'][$_i] = mt_rand(300,400); $rand = $_SESSION['rand'][$_i]; break; } $_SESSION['time'][$_i] = $currentTime; } return $rand; } ?> <div > <i><?php echo _rand(0) ;?></i><b>|</b> <i><?php echo _rand(1) ;?></i><b>|</b> <i><?php echo _rand(2) ;?></i><b>|</b> </div>
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