[英]How to use a PHP class from another file?
Let's say I've got two files class.php and page.php假设我有两个文件class.php和page.php
class.php类.php
<?php
class IUarts {
function __construct() {
$this->data = get_data('mydata');
}
}
?>
That's a very rudamentary example, but let's say I want to use:这是一个非常基本的例子,但假设我想使用:
$vars = new IUarts();
print($vars->data);
in my page.php file;在我的 page.php 文件中; how do I go about doing that?
我该怎么做? If I do
include(LIB.'/class.php');
如果我
include(LIB.'/class.php');
it yells at me and gives me Fatal error: Cannot redeclare class IUarts in /dir/class.php on line 4
它对我大喊大叫并给了我
Fatal error: Cannot redeclare class IUarts in /dir/class.php on line 4
You can use include
/ include_once
or require
/ require_once
您可以使用
include
/ include_once
或require
/ require_once
require_once('class.php');
Alternatively, use autoloading by adding to page.php
或者,通过添加到
page.php
来使用自动加载
<?php
function my_autoloader($class) {
include 'classes/' . $class . '.class.php';
}
spl_autoload_register('my_autoloader');
$vars = new IUarts();
print($vars->data);
?>
It also works adding that __autoload
function in a lib that you include on every file like utils.php
.它还可以在包含在每个文件(如
utils.php
中的库中添加__autoload
函数。
There is also this post that has a nice and different approach.还有这篇文章有一个很好的和不同的方法。
Efficient PHP auto-loading and naming strategies 高效的 PHP 自动加载和命名策略
In this case, it appears that you've already included the file somewhere.在这种情况下,您似乎已经在某处包含了该文件。 But for class files, you should really "include" them using
require_once
to avoid that sort of thing;但是对于类文件,你真的应该使用
require_once
“包含”它们来避免这种事情; it won't include the file if it already has been.如果已经包含该文件,它将不会包含该文件。 (And you should usually use
require[_once]
, not include[_once]
, the difference being that require
will cause a fatal error if the file doesn't exist, instead of just issuing a warning.) (并且您通常应该使用
require[_once]
,而不是include[_once]
,不同之处在于,如果文件不存在, require
将导致致命错误,而不仅仅是发出警告。)
Use include_once
instead.使用
include_once
代替。
This error means that you have already included this file.这个错误意味着你已经包含了这个文件。
include_once(LIB.'/class.php');
Use include("class.classname.php");
使用
include("class.classname.php");
And class should use <?php //code ?> not <? //code ?>
并且类应该使用
<?php //code ?> not <? //code ?>
<?php //code ?> not <? //code ?>
use采用
require_once(__DIR__.'/_path/_of/_filename.php');
This will also help in importing files in from different folders.这也将有助于从不同文件夹导入文件。 Try
extends
method to inherit the classes in that file and reuse the functions尝试
extends
方法来继承该文件中的类并重用这些函数
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