php校验表单检测字段是否为空的方法
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2023-04-06 19:31:18
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。...
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。
<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
<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
" " (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。