模板文件是 .php 并且有这些占位符:
<ul>
<li><a href='a.php'>{{placeholder1}}</a></li>
{{placeholder2}}
</ul>
这是替换它们的代码:
$file = file_get_contents($template);
$file = str_ireplace('{{placeholder1}}', count_messages(), $file);
$file = str_ireplace('{{placeholder2}}', show_link(), $file);
print $file;
函数没什么特别的('functions.php'):
function count_messages()
{
ob_start();
if (preg_match('/^[A-Za-z0-9_]{3,40}$/', $_SESSION['username']))
{
$table = $_SESSION['username'];
}
else
{
header('Location: login.php');
exit();
}
try
{
$db = new PDO('sqlite:site.db');
$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$result = $db->prepare("SELECT Count(*) FROM `$table` WHERE `isRead` = '0'");
$result->execute();
$count = $result->fetchColumn();
if ($count > 0)
{
print "<b style='color: #00ff00; text-decoration: blink;'>$count</b> <b style='font-size: 6pt; text-decoration: blink; text-transform: uppercase;'>unread</b> ";
}
unset($db);
}
catch(PDOException $e)
{
echo $e->getMessage();
}
ob_end_flush();
}
function show_link()
{
ob_start();
if ($_SESSION['username'] == "admin")
{
print "<li><a href='admin_panel.php' target='main_iframe'><b style='color: #ffff00;'>Admin Panel</b></a></li>;
}
ob_end_flush();
}
首先计算带有某种样式的消息和输出编号,如果用户名是“admin”,则第二个添加到菜单“管理面板”链接。
问题是(php 日志中没有错误): count_messages() 有效,但在页面上的所有元素上方输出“n unread”。show_link() 不输出链接。
文件 $template 是可读的并命名为 template.php:
<?php
session_start();
if(!$_SESSION['islogged'])
{
header('Location: login.php');
exit();
}
require_once('functions.php');
?>
<!DOCTYPE HTML>
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<meta charset="UTF-8" />
<meta name="description" content="Documents" />
<link rel="stylesheet" type="text/css" href="style.css" />
<title>Documents</title>
</head>
<body>
<div id="main">
<iframe src="documents.php" name="main_iframe" id="main_iframe">
</iframe>
</div>
<div id="main_menu">
<ul id="menu_list">
<li><a href="messages.php" target="main_iframe">{{placeholder1}}Messages</a></li>
{{placeholder2}}
<li><a href="logout.php" style="font-weight: bold; color: #ff0000">Log out</a></li>
</ul>
</div>
</body>
</html>
index.php:
<?php
session_start();
require_once('functions.php');
$template = 'template.php';
if (file_exists($template))
{
if (is_readable($template))
{
if(!$_SESSION['islogged'])
{
session_destroy();
header('Location: login.php');
exit();
}
}
else
{
print "Template file cannot be opened";
}
}
else
{
print "Template file doesn't exist";
}
$file = file_get_contents($template);
$file = str_ireplace('{{placeholder1}}', count_messages(), $file);
$file = str_ireplace('{{placeholder2}}', show_link(), $file);
print $file;
?>
我希望这里有人知道导致这种行为的原因......