PHP中如何在运行程序之前做一个是否点了按钮的判断？

来源：百度知道 编辑：UC知道 时间：2024/07/03 01:37:27
这是代码，但总是不行.....
<form action="" method="post">
<p>内容：</p>
<p>
<textarea name="content" cols="60" rows="10"></textarea>
</p>
<input type="submit" name="sub" value="确 定"/>
</form>
<?php
session_start();
$f_id = $_SESSION[f_id];
print_r($_POST);
$content = $_POST['content'];
require('mysql.class.php');
$database_name = me_board;
$connection = connect($database_name);
mysql_query('set names utf8');
$sql = "UPDATE follow SET reply='$content' WHERE f_id='$f_id'";
if((!$_POST['sub']=="")){
if($result = mysql_query($sql)){
header("refresh:2;url=display.php");
echo "回复成功，正在跳转....";
}else{
die("回复

<?php
session_start();
$f_id = $_SESSION[f_id];

if(isset($_POST['content']) &&!empty($_POST['content']) )
{
print_r($_POST);
$content = $_POST['content'];
require('mysql.class.php');
$database_name = me_board;
$connection = connect($database_name);
mysql_query('set names utf8');
$sql = "UPDATE follow SET reply='$content' WHERE f_id='$f_id'";

if($result = mysql_query($sql))
{
header("refresh:2;url=display.php");
echo "回复成功，正在跳转....";
}
else
{
die("回复失败");
}

}
?>
<form action="" method="post">
<p>内容：</p>
<p>
<textarea name="content" cols="60" rows="10"></textarea>
</p>
<input type="submit&