这个PHP有什么问题？ 什么都没有出现
[英]What's wrong with this PHP? Nothing is showing up
问题描述
I'm trying to learn PHP, so I could very well be making a very beginner-level mistake. 
我正在尝试学习PHP，所以我很容易犯一个非常初学者级的错误。
Basically, I have a page.php file that is a class file for the page I want to create, and I want to include that in my home.php page (I do that using the require function). 基本上，我有一个page.php文件，它是我要创建的页面的类文件，我想将其包含在我的home.php页面中（我使用require函数来做到这一点）。 However, nothing shows up. 但是，没有任何显示。 I'm doing this based off a book I'm reading, and it seems to work fine there. 我正在根据正在阅读的书进行此操作，并且在此看来效果很好。
page.php: page.php：
<?php
class Page {
// attributes
public $content;
public $title = "TLA Consulting Pty Ltd";
public $keywords = "TLA Consulting, Three Letter Abbreviation, some of my best friends are search engines";
public $buttons = array("Home" => "home.php", "Contact" => "contact.php", "Services" => "services.php", "Site Map" => "map.php");
public function __set($name, $value) {
$this->$name = $value;
}
public function display() {
echo "<html>\n<head>\n";
$this->displayTitle();
$this->displayKeywords();
$this->displayStyle();
echo "</head>\n<body>\n";
$this->displayHeader();
$this->displayMenu($this->buttons); // try this line without giving it the parameter
echo $this->content;
$this->displayFooter();
echo "</body>\n</html>";
}
public function displayTitle() {
echo "<title>$this->title</title>";
}
public function displayKeywords() {
echo "<meta name=\"keywords\" content=\"$this->keywords\" />";
}
public function displayStyle() {
?>
<style>
h1 {
color: white;
font-size: 24px;
text-align: center;
font-family: helvetica, arial, sans-serif;
}
.menu {
color: white;
font-size: 12px;
text-align: center;
font-family: helvetica, arial, sans-serif;
font-weight: bold;
}
td {
background-color: black;
}
p {
color: black;
font-size: 12px;
text-align: justify;
font-family: helvetica, arial, sans-serif;
}
</style>
<?php
}
public function displayHeader() {
?>
<table width="100%" cellpadding="12" cellspacing="0" border="0">
<tr bgcolor="black">
<td aling="left"><img src="http://i.imgur.com/xBrUZ.png" alt="Iron Man's finger" /></td>
<td><h1>TLA Consulting Pty Ltd</h1></td>
</tr>
</table>
<?php
}
public function displayMenu($buttons) {
echo "<table width=\"100%\" bgcolor=\"white\">\n";
echo "<tr>\n";
// calculate button size
$width = 100 / count($buttons);
while (list($name, $url) = each($buttons)) {
$this -> displayButton($width, $name, $url, !this->IsURLCurrentPage($url));
}
echo "</tr>\n</table>\n";
}
public function IsURLCurrentPage($url) {
if (!strpos($_SERVER['PHP_SELF'], $url)) {
return false;
}
else {
return true;
}
}
public function displayButton($width, $name, $url, $active = true) {
if ($active) {
echo "<td width=\"".$width."%\">
<a href=\"$url\"><img src=\"http://i.imgur.com/xBrUZ.png\" alt=\"$name\" /></a>
<a href=\"$url\"><span class=\"menu\">$name</span></a>
</td>";
}
else {
echo "<td width=\"".$width."%\">
<img src=\"http://i.imgur.com/xBrUZ.png\" />
<span class=\"menu\">$name</span>
</td>";
}
}
public function displayFooter() {
echo "<p>I am a footer ololz</p>";
}
}
?>
home.php: home.php：
<?php
require("page.php");
$homepage = new Page();
$homepage->content = "<p>Hi there, I like blueberries greatlly.</p>
<p>I hope you'll join me in loving blueberries!</p>"
$homepage->display();
?>
Any insight would be appreciated. 任何见识将不胜感激。
3 个解决方案
解决方案1
4 已采纳 2012-05-30 15:20:07
Two problems: 两个问题：
-
thisshould be$thison line 86 ofpage.php.this应该是page.php第86行上的$this。 - You need a semicolon at the end of
...blueberries!</p>"您需要在...blueberries!</p>"末尾使用分号...blueberries!</p>"
You might not be seeing the errors if error reporting isn't turned on. 如果未打开错误报告，则可能看不到错误。
解决方案2
2
you are using the beginning and ending of php inconsistently. 您不一致地使用了php的开头和结尾。
For example here: 例如这里：
public function displayStyle() {
?>
<style>
h1 {
color: white;
font-size: 24px;
text-align: center;
font-family: helvetica, arial, sans-serif;
}
.menu {
color: white;
font-size: 12px;
text-align: center;
font-family: helvetica, arial, sans-serif;
font-weight: bold;
}
td {
background-color: black;
}
p {
color: black;
font-size: 12px;
text-align: justify;
font-family: helvetica, arial, sans-serif;
}
</style>
<?php
}
You are starting a function, then you break it with closing the php block "?>" and paste a stylesheet part which will be echoed when the page loads. 您正在启动一个函数，然后通过关闭php块“？>”来破坏它，并粘贴样式表部分，该样式表部分将在页面加载时回显。 If you want to display the style with this function, then you have to make it like: 如果要使用此功能显示样式，则必须使其如下所示：
<?php
public function displayStyle() {
echo "<style>".
"h1 {".
"color: white;";
}
?>
解决方案3
1 2012-05-30 15:22:37
In the home.php file you're missing a semicolon in the ine 10 在home.php文件中，ine 10中缺少分号
In the page.php file you're missing character "$" on line 86 在page.php文件中，第86行缺少字符“ $”
$this -> displayButton($width, $name, $url, !$this->IsURLCurrentPage($url));
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