本文实例讲述了php校验表单检测字段是否为空的方法。分享给大家供大家参考。具体如下：
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。
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<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后端代码，保存为： ErrorCheck.php
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<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> |
trim()函数可以去除字符串中的前后空字符
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" " (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. |
希望本文所述对大家的php程序设计有所帮助。
