[英]php form isset validation
我一直在嘗試為我正在為自己的網站開發的注冊表單實施isset表單驗證。
基本上我需要正確填寫所有字段,否則表單不會$ _post .....
作為即時消息發布到自己(表單action =“”),如果填寫不正確,我將需要重新加載表單並在表單上方顯示錯誤消息。...
這是我的表格代碼....
<?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";
}
?>
我知道這個表單代碼看起來亂碼,而且我討厭凌亂的代碼,但是我必須將其截斷才能在此處發布,否則我將在數百個代碼行之前輸入4個空格
如果有人可以提出解決方案(假定很簡單,但無法弄清楚如何編寫代碼”),我將再次非常感激:D
多謝你們
:bow:一直進行堆棧交換: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: " . $_SERVER["PHP_SELF"]); //Check if the session has the error value filled in and display it on the form.
exit;
}
echo "Form Submitted";
}
?>
表單驗證可以使用javascript完成。
的HTML
<input type="submit" onclick="return validate();" />
JAVASCRIPT
<script type="text/javascript">
function validate()
{
if(document.getElementsByName('username') == "")
{
alert("Please Enter username");
return false;
}
...
}
</script>
您的所有代碼當前都在驗證有人單擊了提交按鈕,但實際上並沒有驗證他們是否輸入了有效值。 了解isset並不會檢查變量是否具有值,而只是檢查變量是否存在,因為所有表單元素都將存在於post數組中,而不管發布了什么值(無論是否發布了值)。
為您提供2條提示:
1)使用foreach循環來評估post數組的每個元素。 您可以創建一個單獨的期望值條件數組,以在循環中進行檢查。 有很多現成可用的驗證過濾器腳本,您可以插入它們以檢查您的期望值是char,int,float等。請始終在插入數據庫或要求進行SQL注入攻擊之前驗證用戶輸入。
2)如果您不了解確切提交的內容,請使用print_r($ _ POST)調試表單提交。
我還發現將PHP放在文件頂部並在下面保留html更加容易。 如果您沒有使用PHP值來預填表單值,則無需回顯html。 這使得編輯html變得更加容易...在else語句的開始和結束處觀察php標簽:
<?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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