How to pass arguments to an included file?
I'm trying to make the whole <head> section its own include file. One drawback is the title and description and keyword will be the same; I can't figure out how to pass arguments to the include file.
So here is the code:
index.php
<?php include("header.php?header=aaaaaaaaaaaaaaaaaaaaa"); ?>
<body>
.....
..
.
header.php
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<link rel="shortcut icon" href="favicon.ico">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<meta name="Keywords" content=" <?php $_GET["header"]?> " >
<meta name="Description" content=" <?php $_GET["header"]?> " >
<title> <?php $_GET["header"]?> </title>
<link rel="stylesheet" type="text/css" href="reset.css" />
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.3/jquery.min.js"></script>
</head>
Obviously this doe开发者_开发技巧sn't work; how can I pass arguments to an included file?
Include has the scope of the line it's called from.
If you don't want to create new global variables, you can wrap include() with a function:
function includeHeader($title) {
include("inc/header.php");
}
$title will be defined in the included code whenever you call includeHeader with a value, for example includeHeader('My Fancy Title').
If you want to pass more than one variable you can always pass an array instead of a string.
Let's create a generic function:
function includeFile($file, $variables) {
include($file);
}
Voila!
Using extract makes it even neater:
function includeFileWithVariables($fileName, $variables) {
extract($variables);
include($fileName);
}
Now you can do:
includeFileWithVariables("header.php", array(
'keywords'=> "Potato, Tomato, Toothpaste",
'title'=> "Hello World"
));
Knowing that it will cause variables $keywords and $title to be defined in the scope of the included code.
index.php:
<?php
$my_header = 'aaaaaaaaaaaaaaaaaaaa';
include 'header.php';
?>
and header.php
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<link rel="shortcut icon" href="favicon.ico" />
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<meta name="Keywords" content=" <?php echo $my_header ?> " />
<meta name="Description" content=" <?php echo $my_header ?> " />
<title> <?php echo $my_header ?> </title>
<link rel="stylesheet" type="text/css" href="reset.css" />
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.3/jquery.min.js"></script>
</head>
It's not an ideal solution, but I understand it's your first steps in php.
PS. Your Doctype doesn't match the code. I've adjusted your header html to be XHTML.
You can't pass arguments to include, but it has access to all variables you've already set. From the include documentation:
When a file is included, the code it contains inherits the variable scope of the line on which the include occurs. Any variables available at that line in the calling file will be available within the called file, from that point forward.
Thus:
index.php
<?php
$header = 'aaaaaaaaaaaaaaaaaaaaa';
include("header.php");
?>
header.php
<title> <?php echo $header; ?> </title>
Well marc, when you are using include, you can simply just set up a variable to use:
<?php
$var = "Testing";
include("header.php");
?>
In your header file:
<?php
echo $var;
?>
Allow your previously defined variables are usable in any include you have.
you are over thinking it
<?php
$header = "aaaaaaaaaaaaaaaaa";
include("header.php");
?>
::EDIT::
Decided I would add value
The included file will gain the scope of where you included it. So if you include a file INSIDE a function:
<?php
$get_me = "yes";
function haha()
{
include("file.php");
}
haha();
// And file.php looks like
echo $get_me; // notice + blank
?>
More over, you include the same file more than once to great effect.
<?php
$output = "this";
include("cool_box.php");
$output = "will";
include("cool_box.php");
$output = "work";
include("cool_box.php");
?>
And even use this to load templates that become part of a method in a class. So you can do something like:
<?php
class template
{
private $name;
function __construct($name)
{
$this->name = preg_replace("/[^a-zA-Z0-9]/", "", $name);
}
function output(array $vars)
{
include($this->name.".php"); // Where $vars is an expected array of possible data
}
}
$head = new template("header");
$body = new template("body");
$head->output();
$head->output(array("content" => "this is a cool page"));
?>
defining a variable as a pseudo-argument/workaround before an include() - as recommended by many - is a bad idea. it introduces a variable in the global scope. define a function in the included file instead to catch the arguments u want to pass.
This is good approach. I however would do it a bit inside out. Define a layout, a wrapper for your webpage and include your content file into it:
layout.phtml
<html>
<head>
... your headers go here
</head>
<body>
<? include $content ?>
</body>
</html>
Your content template file can look like this e.g.
content.phtml
<h1>hello world</h1>
<p>My name is <?= $name ?></p>
Then, you would have your main script (index) that will handle logic, connects to database etc.
index.php
$content = 'content.phtml';
$name = 'Marc'; //Can be pulled from database
include 'layout.phtml';
This way, you can nicely separate business logic and presentation. And it can help you cut repetitive code for parts of page like logo or navigation which are repeated on the whole site.
If you include a file it is just like inserting that code into the parent file. You could simply do this:
<?php
$parameter = "Hello World";
include("header.php");
?>
and then in the header.php
<?php
$parameter = isset($parameter) ? $parameter : "Default Text";
// Use accordingly
?>
I used the isset() method to verify that it has a value already and is instantiated.
I noticed nobody suggested using a template engine. I came looking here because for the project I'm working with, a template engine isn't possible and that might be your situation too, however I thought it might be worth mentioning these: Twig (my preferred engine) and Smarty both allow passing specific variables to includes.
I highly recommend the use of a template engine whenever possible, as it simplifies your front end code, adds a layer of abstraction between your front end and back end, and both Twig and Smarty automatically clean the variables you pass to them which helps mitigate XSS attacks.
Twig Example
header.html
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<link rel="shortcut icon" href="favicon.ico">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<meta name="Keywords" content="{{ header }}" >
<meta name="Description" content="{{ header }}" >
<title> {{ header }} </title>
<link rel="stylesheet" type="text/css" href="reset.css" />
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.3/jquery.min.js"></script>
</head>
index.html
{% include 'header.html' with { 'header' : '<script>alert("this shouldnt work")</script>'} only %}
Body Text
{% include 'footer.html' %}
Smarty Example
header.tpl
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<link rel="shortcut icon" href="favicon.ico">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<meta name="Keywords" content="{$header}" >
<meta name="Description" content="{$header}" >
<title> {$header} </title>
<link rel="stylesheet" type="text/css" href="reset.css" />
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.3/jquery.min.js"></script>
</head>
index.tpl
{include 'header.tpl' header='<script>alert("this shouldnt work")</script>'}
Body Text
{include 'footer.tpl'}
加载中,请稍侯......
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