[英]php form isset validation
我一直在尝试为我正在为自己的网站开发的注册表单实施isset表单验证。
基本上我需要正确填写所有字段,否则表单不会$ _post .....
作为即时消息发布到自己(表单action =“”),如果填写不正确,我将需要重新加载表单并在表单上方显示错误消息。...
这是我的表格代码....
<?php
if(!isset($_POST['submit'])) {
echo '
<form action="" method="post" name="signup">
<table border="1" width="100%">
<tr><td>
<p style="text-align: right;">First Name: </p>
</td><td>
<input name="first_name" type="text" maxlength="25">
</td></tr>
<tr><td>
<p style="text-align: right;">Last Name: </p>
</td><td>
<input name="last_name" type="text" maxlength="25">
</td></tr>
<tr><td>
<p style="text-align: right;">Desired Username: </p>
</td><td>
<input name="username" type="text" maxlength="25">
</td></tr>
<tr><td>
<p style="text-align: right;">Password: </p>
</td><td>
<input name="password" type="password" maxlength="25">
</td></tr>
<tr><td>
<p style="text-align: right;">Confirm Password: </p>
</td><td>
<input name="confpassword" type="password" maxlength="25">
</td></tr>
<tr><td>
<p style="text-align: right;">Date Of Birth: </p>
</td><td>
<select name="dob_day">
<option value="000">Day</option>
<option value="01">01</option>
<option value="02">02</option>
<option value="03">03</option>
<option value="04">04</option>
<option value="05">05</option>
<option value="06">06</option>
<option value="07">07</option>
<option value="08">08</option>
<option value="09">09</option>
<option value="10">10</option>
<option value="11">11</option>
<option value="12">12</option>
<option value="13">13</option>
<option value="14">14</option>
<option value="15">15</option>
<option value="16">16</option>
<option value="17">17</option>
<option value="18">18</option>
<option value="19">19</option>
<option value="20">20</option>
<option value="21">21</option>
<option value="22">22</option>
<option value="23">23</option>
<option value="24">24</option>
<option value="25">25</option>
<option value="26">26</option>
<option value="27">27</option>
<option value="28">28</option>
<option value="29">29</option>
<option value="30">30</option>
<option value="31">31</option>
</select>
<select name="dob_month">
<option value="000">Month</option>
<option value="january">January</option>
<option value="february">February</option>
<option value="march">March</option>
<option value="april">April</option>
<option value="may">May</option>
<option value="june">June</option>
<option value="july">July</option>
<option value="august">August</option>
<option value="september">September</option>
<option value="october">October</option>
<option value="november">November</option>
<option value="december">December</option>
</select>
Year:
<input name="dob_year" type="text" maxlength="4" size="10" value="eg: 1964">
</td></tr>
<tr><td>
<p style="text-align: right;">Email Address: </p>
</td><td>
<input name="email" type="text" maxlength="50">
</td></tr>
<tr><td>
<p style="text-align: right;">Gender: </p>
</td><td>
Male: <input type="radio" name="gender" value="male" />
Female: <input type="radio" name="gender" value="female" />
</td></tr>
</table><p>
<center><input type="submit" name="submit" value=" Sign-Up "></center>
</font>
';}
else
{
echo "Form Submitted";
}
?>
我知道这个表单代码看起来乱码,而且我讨厌凌乱的代码,但是我必须将其截断才能在此处发布,否则我将在数百个代码行之前输入4个空格
如果有人可以提出解决方案(假定很简单,但无法弄清楚如何编写代码”),我将再次非常感激:D
多谢你们
:bow:一直进行堆栈交换:bow:
else
{
$accept=true;
if(!isset($_POST["value1"])){
$accept=false;
$_SESSION["error"] .= "Please fill in value1\n";
}
//.... Other values
if(!$accept){
header("Location: Current file name"); //Check if the session has the error value filled in and display it on the form.
exit;
}
echo "Form Submitted";
}
完整示例:
<?php
session_start();
if(!isset($_POST['submit'])) {
echo '
<form action="" method="post" name="signup">
<table border="1" width="100%">
<tr><td colspan="2">' . $_SESSION['error'] . ' </td></tr>
<tr><td>
<p style="text-align: right;">First Name: </p>
</td><td>
<input name="first_name" type="text" maxlength="25">
</td></tr>
<tr><td>
<p style="text-align: right;">Last Name: </p>
</td><td>
<input name="last_name" type="text" maxlength="25">
</td></tr>
<tr><td>
<p style="text-align: right;">Desired Username: </p>
</td><td>
<input name="username" type="text" maxlength="25">
</td></tr>
<tr><td>
<p style="text-align: right;">Password: </p>
</td><td>
<input name="password" type="password" maxlength="25">
</td></tr>
<tr><td>
<p style="text-align: right;">Confirm Password: </p>
</td><td>
<input name="confpassword" type="password" maxlength="25">
</td></tr>
<tr><td>
<p style="text-align: right;">Date Of Birth: </p>
</td><td>
<select name="dob_day">
<option value="000">Day</option>
<option value="01">01</option>
<option value="02">02</option>
<option value="03">03</option>
<option value="04">04</option>
<option value="05">05</option>
<option value="06">06</option>
<option value="07">07</option>
<option value="08">08</option>
<option value="09">09</option>
<option value="10">10</option>
<option value="11">11</option>
<option value="12">12</option>
<option value="13">13</option>
<option value="14">14</option>
<option value="15">15</option>
<option value="16">16</option>
<option value="17">17</option>
<option value="18">18</option>
<option value="19">19</option>
<option value="20">20</option>
<option value="21">21</option>
<option value="22">22</option>
<option value="23">23</option>
<option value="24">24</option>
<option value="25">25</option>
<option value="26">26</option>
<option value="27">27</option>
<option value="28">28</option>
<option value="29">29</option>
<option value="30">30</option>
<option value="31">31</option>
</select>
<select name="dob_month">
<option value="000">Month</option>
<option value="january">January</option>
<option value="february">February</option>
<option value="march">March</option>
<option value="april">April</option>
<option value="may">May</option>
<option value="june">June</option>
<option value="july">July</option>
<option value="august">August</option>
<option value="september">September</option>
<option value="october">October</option>
<option value="november">November</option>
<option value="december">December</option>
</select>
Year:
<input name="dob_year" type="text" maxlength="4" size="10" value="eg: 1964">
</td></tr>
<tr><td>
<p style="text-align: right;">Email Address: </p>
</td><td>
<input name="email" type="text" maxlength="50">
</td></tr>
<tr><td>
<p style="text-align: right;">Gender: </p>
</td><td>
Male: <input type="radio" name="gender" value="male" />
Female: <input type="radio" name="gender" value="female" />
</td></tr>
</table><p>
<center><input type="submit" name="submit" value=" Sign-Up "></center>
</font>
';}
else
{
$accept=true;
if(!isset($_POST["first_name"])){
$accept=false;
$_SESSION["error"] .= "Please fill in your first name.<br />";
}
//.... Other values
if(!$accept){
header("Location: " . $_SERVER["PHP_SELF"]); //Check if the session has the error value filled in and display it on the form.
exit;
}
echo "Form Submitted";
}
?>
表单验证可以使用javascript完成。
的HTML
<input type="submit" onclick="return validate();" />
JAVASCRIPT
<script type="text/javascript">
function validate()
{
if(document.getElementsByName('username') == "")
{
alert("Please Enter username");
return false;
}
...
}
</script>
您的所有代码当前都在验证有人单击了提交按钮,但实际上并没有验证他们是否输入了有效值。 了解isset并不会检查变量是否具有值,而只是检查变量是否存在,因为所有表单元素都将存在于post数组中,而不管发布了什么值(无论是否发布了值)。
为您提供2条提示:
1)使用foreach循环来评估post数组的每个元素。 您可以创建一个单独的期望值条件数组,以在循环中进行检查。 有很多现成可用的验证过滤器脚本,您可以插入它们以检查您的期望值是char,int,float等。请始终在插入数据库或要求进行SQL注入攻击之前验证用户输入。
2)如果您不了解确切提交的内容,请使用print_r($ _ POST)调试表单提交。
我还发现将PHP放在文件顶部并在下面保留html更加容易。 如果您没有使用PHP值来预填表单值,则无需回显html。 这使得编辑html变得更加容易...在else语句的开始和结束处观察php标签:
<?php
if(isset($_POST['submit'])) {
echo "Form Submitted";
}
else{ ?>
<form action="" method="post" name="signup">
<table border="1" width="100%">
<tr><td>
<p style="text-align: right;">First Name: </p>
</td><td>
<input name="first_name" type="text" maxlength="25">
</td></tr>
<tr><td>
<p style="text-align: right;">Last Name: </p>
</td><td>
<input name="last_name" type="text" maxlength="25">
</td></tr>
<tr><td>
<p style="text-align: right;">Desired Username: </p>
</td><td>
<input name="username" type="text" maxlength="25">
</td></tr>
<tr><td>
<p style="text-align: right;">Password: </p>
</td><td>
<input name="password" type="password" maxlength="25">
</td></tr>
<tr><td>
<p style="text-align: right;">Confirm Password: </p>
</td><td>
<input name="confpassword" type="password" maxlength="25">
</td></tr>
<tr><td>
<p style="text-align: right;">Date Of Birth: </p>
</td><td>
<select name="dob_day">
<option value="000">Day</option>
<option value="01">01</option>
<option value="02">02</option>
<option value="03">03</option>
<option value="04">04</option>
<option value="05">05</option>
<option value="06">06</option>
<option value="07">07</option>
<option value="08">08</option>
<option value="09">09</option>
<option value="10">10</option>
<option value="11">11</option>
<option value="12">12</option>
<option value="13">13</option>
<option value="14">14</option>
<option value="15">15</option>
<option value="16">16</option>
<option value="17">17</option>
<option value="18">18</option>
<option value="19">19</option>
<option value="20">20</option>
<option value="21">21</option>
<option value="22">22</option>
<option value="23">23</option>
<option value="24">24</option>
<option value="25">25</option>
<option value="26">26</option>
<option value="27">27</option>
<option value="28">28</option>
<option value="29">29</option>
<option value="30">30</option>
<option value="31">31</option>
</select>
<select name="dob_month">
<option value="000">Month</option>
<option value="january">January</option>
<option value="february">February</option>
<option value="march">March</option>
<option value="april">April</option>
<option value="may">May</option>
<option value="june">June</option>
<option value="july">July</option>
<option value="august">August</option>
<option value="september">September</option>
<option value="october">October</option>
<option value="november">November</option>
<option value="december">December</option>
</select>
Year:
<input name="dob_year" type="text" maxlength="4" size="10" value="eg: 1964">
</td></tr>
<tr><td>
<p style="text-align: right;">Email Address: </p>
</td><td>
<input name="email" type="text" maxlength="50">
</td></tr>
<tr><td>
<p style="text-align: right;">Gender: </p>
</td><td>
Male: <input type="radio" name="gender" value="male" />
Female: <input type="radio" name="gender" value="female" />
</td></tr>
</table><p>
<center><input type="submit" name="submit" value=" Sign-Up "></center>
</font>
<?php } ?>
<html>
<body>
<form action="<?php $_PHP_SELF ?>" method="GET">
Name: <input type="text" name="name" />
Age: <input type="text" name="age" />
<input type="submit" name="submit" value="submit"/>
</form>
<?php
if (isset($_GET['submit']))
{
$name = $_GET['name'];
$age = $_GET['age'];
echo "Welcome ".$name."<br />" ;
echo "You are ".$age." years old<br/>";
}
else
{
echo "enter the appropriate details";
exit();
}
?>
</body>
</html>
<html>
<body>
if
(isset($_GET['actie']) && $_GET['actie']== "registreren") {
//registreerformulier
echo "<form method='post' action='".$_SERVER['PHP_SELF']."?actie=aanmaken'>
Voornaam <input name='voornaam' type='text' /> <br />
Familienaam <input name='familienaam' type='text' /> <br />
Wachtwoord <input name='wachtwoord' type='password' /> <br />
Wachtwoord-controle <input name='wachtwoordControle' type='password' /> <br />
<input name='submit' type='submit' value='Maak gebruiker aan' />
</form>";
</body>
</html>
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