发表于 2020-02-10 17:00:13 by 月小升
php有个自动加载的函数叫__autoload，当找不到一个类包的时候，系统会执行这个函数
1.建立一个学生类文件Stu.class.php
<?php
//create by java-er.com 2020-02-10
class Stu{
private $name;
private $sex;
function __construct($name,$sex){
$this->name = $name;
$this->sex = $sex;
}
function call(){
echo "my name is ".$this->name;
echo "<hr />I am a ".$this->sex;
}
}
?> |
<?php
//create by java-er.com 2020-02-10
class Stu{
private $name;
private $sex;
function __construct($name,$sex){
$this->name = $name;
$this->sex = $sex;
}
function call(){
echo "my name is ".$this->name;
echo "<hr />I am a ".$this->sex;
}
}
?>
2.建立一个测试文件 test.php
当系统找不到Stu类的时候，自动执行__autoload函数，帮我们require进来。
<?php
//create by java-er.com 2020-02-10
function __autoload($class){
require_once $class.'.class.php';
}
$stu = new Stu('Jack',"boy");
$stu->call();
?> |
<?php
//create by java-er.com 2020-02-10
function __autoload($class){
require_once $class.'.class.php';
}
$stu = new Stu('Jack',"boy");
$stu->call();
?>
输出
my name is Jack
I am a boy |
my name is Jack
I am a boy
3.命名空间的处理
建立一个文件夹Lib Lib 下设置一个文件score
<?php
namespace Lib;
//create by java-er.com 2020-02-10
class Score{
private $name;
private $score;
function __construct($name,$score){
$this->name = $name;
$this->score = $score;
}
function call(){
echo "my name is ".$this->name;
echo "<hr />My sports score is ".$this->score;
}
}
?> |
<?php
namespace Lib;
//create by java-er.com 2020-02-10
class Score{
private $name;
private $score;
function __construct($name,$score){
$this->name = $name;
$this->score = $score;
}
function call(){
echo "my name is ".$this->name;
echo "<hr />My sports score is ".$this->score;
}
}
?>
修改test.php如下
<?php
//create by java-er.com 2020-02-10
function __autoload($class){
echo '['.$class.']<hr>';
$class = str_replace("\\", "/", $class);
require_once $class.'.class.php';
}
$stu = new Stu('Jack',"boy");
$stu->call();
echo '<hr />';
use Lib\Score;
$score = new Score('Tom','97');
$score->call();
?> |
<?php
//create by java-er.com 2020-02-10
function __autoload($class){
echo '['.$class.']<hr>';
$class = str_replace("\\", "/", $class);
require_once $class.'.class.php';
}
$stu = new Stu('Jack',"boy");
$stu->call();
echo '<hr />';
use Lib\Score;
$score = new Score('Tom','97');
$score->call();
?>
输出
[Stu]
my name is Jack
I am a boy
[Lib\Score]
my name is Tom
My sports score is 97 |
[Stu]
my name is Jack
I am a boy
[Lib\Score]
my name is Tom
My sports score is 97
This entry was posted in
PHP and tagged
autoload,
php,
php函数. Bookmark the
permalink.
月小升QQ 2651044202, 技术交流QQ群 178491360
首发地址：
月小升博客 –
https://java-er.com/blog/php-autoload-class/
无特殊说明，文章均为月小升原创，欢迎转载，转载请注明本文地址，谢谢
您的评论是我写作的动力.