這篇文章主要介紹了php校驗(yàn)表單檢測(cè)字段是否為空的方法,涉及php驗(yàn)證表單的技巧,非常具有實(shí)用價(jià)值,需要的朋友可以參考下
本文實(shí)例講述了php校驗(yàn)表單檢測(cè)字段是否為空的方法。分享給大家供大家參考。具體如下：
php校驗(yàn)表單，檢測(cè)字段是否為空，當(dāng)表單中有未填寫的字段，則會(huì)顯示錯(cuò)誤信息。
<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后端代碼，保存為： 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()函數(shù)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.
希望本文所述對(duì)大家的php程序設(shè)計(jì)有所幫助。