《PHP学习:php校验表单检测字段是否为空的方法》要点:
本文介绍了PHP学习:php校验表单检测字段是否为空的方法,希望对您有用。如果有疑问,可以联系我们。
PHP编程本文实例讲述了php校验表单检测字段是否为空的办法.分享给大家供大家参考.具体如下:
PHP编程php校验表单,检测字段是否为空,当表单中有未填写的字段,则会显示错误信息.
PHP编程
<html>
<body>
<form METHOD="POST" ACTION="ErrorCheck.php">
<h1>Contact Information</h1>
<label>Nickname:</label>
<input TYPE="TEXT" NAME="nickname">
<label>Title:</label>
<input TYPE="TEXT" NAME="title">
<br />
<input TYPE="SUBMIT" VALUE="Submit">
<br />
<input TYPE="RESET" VALUE="Clear the Form">
</form>
</body>
</html>
PHP编程php后端代码,保存为: ErrorCheck.php
PHP编程
<html>
<body>
<?php
$errorcount=0;
if (!trim($_POST['nickname'])) {
echo "<br /><b>Nickname</b> is required.";
$errorcount++;
}
if (!trim($_POST['title'])) {
echo "<br /><b>Title</b> is required.";
$errorcount++;
}
if ($errors > 0)
echo "<br /><br />Please use your browser's back button " .
"to return to the form, and correct error(s)";
?>
</body>
</html>
PHP编程trim()函数可以去除字符串中的前后空字符
PHP编程
" " (ASCII 32 (0×20)), an ordinary space.
"\t" (ASCII 9 (0×09)), a tab.
"\n" (ASCII 10 (0x0A)), a new line (line feed).
"\r" (ASCII 13 (0x0D)), a carriage return.
"\0″ (ASCII 0 (0×00)), the NUL-byte.
"\x0B" (ASCII 11 (0x0B)), a vertical tab.
PHP编程希望本文所述对大家的php程序设计有所赞助.
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