php trim() 表单验证不为空实例_php教程

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.

<html>

<body>

<form method="post" action="formerrorcheck.php">

<h1>contact information</h1>

<table>

<tr>

  <td><b>nickname:</b></td>

  <td><input type="text" name="nickname"></td>

</tr>

<tr>

  <td>title:</td>

  <td><input type="text" name="title"></td>

</tr>

<tr>

  <td><b>first name:</b></td>

  <td><input type="text" name="firstname"></td>

</tr>

<tr>

  <td>middle name:</td>

  <td><input type="text" name="middlename"></td>

</tr>

<tr>

  <td><b>last name:</b></td>

  <td><input type="text" name="lastname"></td>

</tr>

<tr>

  <td><b>primary email:</b></td>

  <td><input type="text" name="email"></td>

  <td width="20"> </td>

  <td>secondary email:</td>

  <td><input type="text" name="secondaryemail"></td>

</tr>

<tr>

  <td>company name:</td>

  <td><input type="text" name="companyname"></td>

</tr>

<tr>

  <td>office address:</td>

  <td><input type="text" name="officeaddres1"></td>

  <td width="20"> </td>

  <td>home address:</td>

  <td><input type="text" name="homeaddress"></td>

</tr>

<tr>

  <td></td>

  <td><input type="text" name="officeaddress2"></td>

</tr>

<tr>

  <td>city:</td>

  <td><input type="text" name="officecity"></td>

  <td width="20"> </td>

  <td> </td>

  <td><input type="text" name="homecity"></td>

</tr>

<tr>

  <td>state:</td>

  <td><input type="text" name="officestate"></td>

  <td width="20"> </td>

  <td> </td>

  <td><input type="text" name="homestate"></td>

</tr>

<tr>

  <td>zip:</td>

  <td><input type="text" name="officezip"></td>

  <td width="20"> </td>

  <td> </td>

  <td><input type="text" name="homezip"></td>

</tr>

<tr>

  <td>phone:</td>

  <td><input type="text" name="officephone"></td>

  <td width="20"> </td>

  <td> </td>

  <td><input type="text" name="homephone"></td>

</tr>

<tr>

  <td>birthday:</td>

  <td><input type="text" name="birthday"></td>

</tr>

<tr>

  <td>spouse name:</td>

  <td><input type="text" name="spousename"></td>

  <td width="20"> </td>

  <td>childrens' names:</td>

  <td><input type="text" name="children"></td>

</tr>

<tr>

  <td>anniversary:</td>

  <td><input type="text" name="anniversary"></td>

</tr>

</table>

<br>

<br>

<br>

<input type="submit" value="submit">

<br>

<br>

<input type="reset"  value="clear the form">

</form>

</body>

</html>

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;

    }

?>

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php trim() 表单验证不为空实例