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。