php trim() 表单验证不为空实例,应该算是入门级的实例了,告诉你如何利用trim函数来删除空格然后判断用户提交的数据是否为空.
formerrorcheck.php
- <html>
- <body>
- <?php
-
- $errors=0;
- if (!trim($nickname)) {
- echo "<br><b>nickname</b> is required.";
- $errors++;
- }
-
- if (!trim($firstname)) {
- echo "<br><b>first name</b> is required.";
- $errors++;
- }
-
- if (!trim($lastname)) {
- echo "<br><b>last name</b> is required.";
- $errors++;
- }
-
- if (!trim($email)) {
- echo "<br><b>primary email address</b> is required.";
- $errors++;
- }
-
- if ($errors > 0)
- echo "<br><br><br>please use your browser's back button " .
- "to return to the form, and correct error(s)";
-
- ?>
-
- </body>
- </html>
这是个简单的验证函数:
- <?php
- function phone_validate($data, $desc) {
- $regex = "/^([2-9][0-9]{2})[2-9][0-9]{2}-[0-9]{4}/i";
- if(preg_match($regex, $data) != 1) {
- return "the '$desc' field isn't valid!";
- }
- return true;
- }
- ?>