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php trim() 表单验证不为空实例

来源：程序员人生发布时间：2013-12-24 19:42:41 阅读次数：3381次

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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