$ _POST并不总是设置？ [英] $_POST not always set?
问题描述
是否可以点击一个按钮，而不是它的值和名称存储在_POST中的
？
我有这个脚本用一个按钮就可以了。当您单击按钮时，页面
会自行发布。第一次单击此保存更改按钮时，_POST
为空。单击按钮后，再次加载页面，如果您再次单击保存更改，则会正确设置_POST。什么是
那个？
$ studentCode; //将保留当前的学生代码（如果适用）
....
foreach（array_keys（$ _ POST）as $ key）
{
$$ key = $ _POST [$ key];
print" $ key is $ {$ key}< br />" ;;
echo"它是：" 。 $ _POST [" Submit"]。 " br>";
}
if（$ _POST [" Submit"] ==" Add Student"）//保存按钮被点击
addRecord（）;
elseif（$ _POST [" Submit"] ==" Save Changes"）//保存更改按钮被点击
updateStudent（）;
echo"我们正在保存更改< br>";
elseif（$ _GET [" action"]！= 添加）
getOldData（$ record）;
echo"< table summary = \" \" cellpadding = \" 5 \">" ;;
function printLabelCell（）
{
echo " \ n< tr>< td align = \" right \">" ;;
}
if（ isset（$ _ GET [" studentCode"]））
$ studentCode = $ _GET [" studentCode"];
elseif（isset（$ _ POST [" studentCode" ;]））
$ studentCode = $ _POST [" studentCode"];
if（$ studentCode！=""）
$ postType =" post？studentCode =" 。 $ studentCode;
else
$ postType =" post";
echo''< form action =" addEditStudent.php" method ="''。 $ postType。 ''">'';
// ...在单元格中打印控件...
echo"< ; tr>< td colspan = \" 2 \" align = \" center \">" ;;
echo''< br>'';
if（$ _GET [" action"] ==" add"或isset（$ _ POST [" firstName"]））
echo''< input type =" Submit"命名= [提交" value =" Add Student">& nbsp;
& nbsp; &安培; NBSP; '';
else
echo''< input type ="提交"命名= [提交" value ="保存更改">'';
echo''& nbsp; &安培; NBSP; &安培; NBSP; < input type ="重置"命名= QUOT;复位" value ="清楚
数据"< br>< br>'';
echo"< / td>< / tr>< / table>" ;;
echo"< / form>" ;;
函数DisplayTextbox（$ vname，$ size，$ value）
{
echo"< / td>< td><输入类型= \" text \" ; name = \"" 。 $ vname。 " \"尺寸= \""
.. $尺寸。 " \"值= \"" 。 $ value。 " \">< / td>< / tr>" ;;
}
mysql_close（$ link）;
....
< Ade
-
Adrian Parker。被任命的牧师。 < ad *********** @ sympatico.ca>
将图形暴力视为娱乐的社会......不应该是
毫无意义的暴力事件打破了最年轻的梦想和b $ b bigh bigh...... - 少尉（2004年3月）
Is it possible to click on a button, and not have it''s value and name stored
in _POST?
I have this script with a button on it. When you click the button, the page
posts to itself. The first time you click this Save Changes button, _POST
is empty. After clicking the button, and the page is loaded again, if you
click Save Changes once more the _POST is properly set. What''s up with
that?
$studentCode; // Will hold the current student code, if applicable
....
foreach(array_keys($_POST) as $key)
{
$$key = $_POST[$key];
print "$key is ${$key}<br />";
echo "It is: " . $_POST["Submit"] . "<br>";
}
if ($_POST["Submit"] == "Add Student") // Save button was hit
addRecord();
elseif ($_POST["Submit"] == "Save Changes") // Save changes button was hit
updateStudent();
echo "We''re saving changes<br>";
elseif ($_GET["action"] != "add")
getOldData($record);
echo "<table summary=\"\" cellpadding=\"5\">";
function printLabelCell()
{
echo "\n<tr><td align=\"right\">";
}
if (isset($_GET["studentCode"]))
$studentCode = $_GET["studentCode"];
elseif (isset($_POST["studentCode"]))
$studentCode = $_POST["studentCode"];
if ($studentCode != "")
$postType = "post?studentCode=" . $studentCode;
else
$postType = "post";
echo ''<form action="addEditStudent.php" method="'' . $postType . ''">'';
// ... print controls in the cells ...
echo "<tr><td colspan=\"2\" align=\"center\">";
echo ''<br>'';
if ($_GET["action"] == "add" or isset($_POST["firstName"]))
echo ''<input type="Submit" name="Submit" value="Add Student">
'';
else
echo ''<input type="Submit" name="Submit" value="Save Changes">'';
echo '' <input type="Reset" name="Reset" value="Clear
Data"><br><br>'';
echo "</td></tr></table>";
echo "</form>";
function DisplayTextbox($vname, $size, $value)
{
echo "</td><td><Input type=\"text\" name = \"" . $vname . "\" Size = \""
.. $size . "\" value=\"" . $value . "\"></td></tr>";
}
mysql_close($link);
....
<Ade
--
Adrian Parker. Ordained priest. <ad***********@sympatico.ca>
"A society that views graphic violence as entertainment ...should not be
surprised when senseless violence shatters the dreams of it''s youngest and
brightest..." - Ensign (March 2004)
推荐答案
studentCode; //将保留当前的学生代码（如果适用）
....
foreach（array_keys（
studentCode; // Will hold the current student code, if applicable
....
foreach(array_keys(
_POST）as
key）
{
key)
{
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