PHP-如何使 str_shuffle 產生不同的值？ $randomcode="QWERTYUIOPASDFGHJKLZXCVBNM1234567890qwertyuiopasdfghjklzxcvbnm";$randomcode='NT'.substr(str_shuffle($str),5,8); echo $randomcode.'<br>'; echo $randomcode.'<br>';結果：NT2ZCI1qdXNT2ZCI1qdX如何產生不同的值？我想將它插入到我的數據庫中。$randomcode="QWERTYUIOPASDFGHJKLZXCVBNM1234567890qwertyuiopasdfghjklzxcvbnm";$randomcode=substr(str_shuffle($str),5,8);$stmt = $pdo->prepare("insert into AGEGroup (AGE,hidecode) values (:age,$randomcode)");foreach ($_POST['age'] as $age) { $stmt->execute([':age'=>$age]);}非常感謝
1 回答
富國滬深
TA貢獻1790條經驗 獲得超9個贊
您應該在循環內生成代碼。
//list of possible characters in generated code
$charmap = "QWERTYUIOPASDFGHJKLZXCVBNM1234567890qwertyuiopasdfghjklzxcvbnm";
//note using `:randomcode` instead of the direct variable
$stmt = $pdo->prepare("insert into AGEGroup (AGE) values (:age, :randomcode)");
foreach ($_POST['age'] as $age) {
//create a "random" string that is 8 characters.
//string will never repeat any characters, and can create duplicates
$code = 'NT' . substr(str_shuffle($charmap), -8);
//send variables to query on each loop
$stmt->execute([':age' => $age, ':randomcode' => $code]);
}
正如我在代碼注釋中所說，這種方法可能有創建重復代碼的傾向。它也不包含任何重復的字母/數字。
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