以下程式碼將透過簡單的方式來偵測name 欄位是否包含字母和空格,如果name 欄位值不合法,將輸出錯誤訊息:
$name = test_input($_POST["name"]); if (!preg_match("/^[a-zA-Z ]*$/",$name)) { $nameErr = "只允许字母及空格"; }
PS:
preg_match — 進行正規表示式比對。
語法:int preg_match ( string $pattern , string $subject [, array $matches [, int $flags ]] )
在subject 字串中搜尋與pattern 給出的正規表示式相符的內容。如果提供了 matches ,則其會被搜尋的結果所填滿。 $matches[0] 將包含與整個模式相符的文本,$matches[1] 將包含與第一個捕獲的括號中的子模式所匹配的文本,以此類推。以下程式碼將透過簡單的方式來偵測 e-mail 位址是否合法。如果 e-mail 位址不合法,將輸出錯誤訊息:
$email = test_input($_POST["email"]); if (!preg_match("/([\w\-]+\@[\w\-]+\.[\w\-]+)/",$email)) { $emailErr = "非法邮件地址"; }
以下程式碼將偵測URL位址是否合法 (以下正規表示式執行URL中含有破折號:"-"), 如果 URL 位址不合法,將輸出錯誤訊息:
$website = test_input($_POST["website"]); if (!preg_match("/\b(?:(?:https?|ftp):\/\/|www\.)[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-z0-9+&@#\/%=~_|]/i",$website)) { $websiteErr = "不合法的 URL"; }
程式碼如下所示:
實例
<?php // 定义变量并设为空值 $nameErr = $emailErr = $genderErr = $websiteErr = ""; $name = $email = $gender = $comment = $website = ""; if ($_SERVER["REQUEST_METHOD"] == "POST") { if (empty($_POST["name"])) {$nameErr = "Name is required";} else { $name = test_input($_POST["name"]); // check if name only contains letters and whitespace if (!preg_match("/^[a-zA-Z ]*$/",$name)) { $nameErr = "Only letters and white space allowed"; } } if (empty($_POST["email"])) {$emailErr = "Email is required";} else { $email = test_input($_POST["email"]); // check if e-mail address syntax is valid if (!preg_match("/([\w\-]+\@[\w\-]+\.[\w\-]+)/",$email)) { $emailErr = "Invalid email format"; } } if (empty($_POST["website"])) {$website = "";} else { $website = test_input($_POST["website"]); // check if URL address syntax is valid (this regular expression also allows dashes in the URL) if (!preg_match("/\b(?:(?:https?|ftp):\/\/|www\.)[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-z0-9+&@#\/%=~_|]/i",$website)) { $websiteErr = "Invalid URL"; } } if (empty($_POST["comment"])) {$comment = "";} else {$comment = test_input($_POST["comment"]);} if (empty($_POST["gender"])) {$genderErr = "Gender is required";} else {$gender = test_input($_POST["gender"]);} } ?>
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