全局变量级别范围，我尝试实现删除功能，并在删除查询内部替换表名称的全局变量，如下面的代码，但是当我在用户点击之前测试时＃39 ;删除＆＃39;它已定义，但在单击按钮后，变量未定义。
$GLOBALS['$table']由用户填写，使用不同的功能，当我首先回显$GLOBALS['$table']时，它会向我显示值，这很好。
<?php
function DeleteOption()
{
include ('../CIEcon.php');
echo "<form action= 'Delete.php' method = 'post'>";
echo $GLOBALS['$table'];
if (isset($_POST['delete'])) {
if (empty($_POST['Id']) || $_POST['Id'] == 0) {
echo "<h4> please choose something to delete </h4>";
echo $GLOBALS['$table'] . "hmmmm";
}
else {
$impid = implode("' , '", $_POST['Id']);
$sqlDelete = "DELETE " . $GLOBALS['$table'] . " WHERE Id IN ('" . $impid . "')";
$DeleteQuery = mysqli_query($dbCIE, $sqlDelete) or die("Error : " . mysqli_error($dbCIE));
}
} // end of delete...
else {
echo "";
}
echo "</form >";
}; // End of Delete Function..
这就是用户定义$ Globle [＆＃39;表格＆＃39;]的方式
<?php
include('../CIEcon.php');
$GLOBALS['$table']="";
function DisplayOption(){
include('../CIEcon.php');
echo '
<form action= "Delete.php" method = "post">
<table width ="40%" cellpadding ="4" border="1" align="center" >
<tr >
<th style ="color: white; background-color: #f26822 ; " > Select a Catagory To Delete From </th>
</tr>';
echo "<tr>
<td>".
"<select name = lists >
<option name= nothing value= 0 selected >Choose a Catagory</option>
<option name= nothing value= 1 > Advertising </option>
<option name= nothing value= 2> Fiscal </option>
<option name= nothing value= 3> Food </option>
<option name= nothing value= 4> Shopping </option>
<option name= nothing value= 5> Rentals </option>
<option name= nothing value= 6> Setting up </option>
<option name= nothing value= 7> Performances </option>
<option name= nothing value= 8> Registration/Ushering </option>
<option name= nothing value= 9> Master of Ceremonies </option>
<option name= nothing value= 10> Cleaning up </option>
<option name= nothing value= 11> Others </option>
</select>"
." </td>
</tr>";
echo '
</table>
<br/>
<div align="center">
<input type="submit" name="submit" value="submit" />
<input type="reset" value="Clear" />
<hr> <hr>
</div>
</form>
';
///
};
function SelectOption(){
include('../CIEcon.php');
///
if(isset($_POST['submit'])){
if(isset($_POST['submit'])) // second submit
{
$errorMessage = "";
if(($_POST['lists'])== 0) // trying to get error if user don't choose.
{
$errorMessage .= "<li>You Forgot to Choose !</li>";
}
$lists = $_POST['lists']; // <-save info in variable based on user input
if(!empty($errorMessage))
{
echo("<p>There was an error with your form:</p>\n");
echo("<ul>" . $errorMessage . "</ul>\n");
die();
}
} // end of second submit
switch($lists)
{
case '1':
$GLOBALS['$table'] ="Advertising";
break;
case '2':
$GLOBALS['$table'] ="Fiscal";
break;
case '3':
$GLOBALS['$table']="Food";
break;
case '4':
$GLOBALS['$table'] ="Shopping";
break;
case '5':
$GLOBALS['$table'] ="Rentals";
break;
case '6':
$GLOBALS['$table'] ="SettingUp";
break;
case '7':
$GLOBALS['$table'] ="Performances";
break;
case '8':
$GLOBALS['$table'] ="Registration";
break;
case '9':
$GLOBALS['$table'] ="MasterOfCeremonies";
break;
case '10':
$GLOBALS['$table'] ="Cleaning";
break;
case '11':
$GLOBALS['$table']="Others";
break;
default;
echo 'Unsupported category';
break;
}
if ($GLOBALS['$table'] != ""){
$sql = "SELECT * FROM ". $GLOBALS['$table']. " ";
$result = mysqli_query($dbCIE, $sql) or die(mysqli_error($dbCIE));
//trying this...
$_SESSION["tbl"] = $GLOBALS['$table'];
/// NOW DISPLAY ALL INFO FROM CHOSEN DATABASE...///
echo "
<form action= 'Delete.php' method = 'post'>
<table cellpadding ='4' border='1' width='80%' align='center'>
<tr>
<th>Check </th>
<th>Job's Name</th>
<th>Description</th>
<th> No Students needed</th>
<th>Due Date</th>
</tr>";
while($row = mysqli_fetch_array($result))
{
echo "<br>";
echo "<tr>";
echo "<td> <input type='checkbox' name='Id[]' value='". $row['Id'] ."' /> </td>";
// echo "<td> <input type='checkbox' name='Table[]' value='". $GLOBALS['$table'] ."' /> </td>";
echo "<td>" . $row['JobName'] . "</td>";
echo "<td>" . $row['Description'] . "</td>";
echo "<td>" . $row['NoStudent'] . "</td>";
echo "<td>" . $row['DueDate'] . "</td>";
echo "</tr>";
}
echo "</table>";
/// END THE SEARCH HERE...........///
echo " <br>
<div align='center'>
<input type='reset' value='clear' >
<input type='submit' name='delete' value='delete'>
</div>
</form>";
} // End if !table="";
} else { }
///
};// end of function SelectOption
答案 0 :(得分：1)
我看到你们已经在尝试使用会话变量的概念了。以下是如何做到这一点：
在PHP文件的最顶层，就在这一行的下方：
$GLOBALS['$table']="";
添加：
session_start();
if (isset($_SESSION['table'])) {
$GLOBALS['$table'] = $_SESSION['table'];
}
// rest of your PHP code...
然后在函数 SelectOption 中，紧接着：
switch($lists)
{
...
}
添加以下行：
$_SESSION['table'] = $GLOBALS['$table'];
这样可以使所选表在请求中保持活动状态。
但是，我建议您重写代码并更好地将输出HTML的部分与初始化变量和执行SQL的部分分开。将这两者分开越好，维护代码就越容易。