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                ## 什么是composer?以及composer是干什么用的?工作原理 > Composer 是 PHP依賴管理工具。 > 在composer.json里寫好依賴包配置,就會自動安裝這些依賴包,使用的是PSR4規范。 ## php 自動加載 ### 結構 > > models >>> Haha.php > > util >>> Hehe.php > autoload.php > test.php ### 加載文件 (autoload.php) ``` spl_autoload_register(function ($className) { $classFileName = ".".DIRECTORY_SEPARATOR."{$className}.php"; echo "我來包含!{$classFileName}\r\n"; include "./{$className}.php"; }); ``` ### 模型文件 (models/Haha.php) > Hehe.php就省略,同Haha.php一樣 ``` namespace models; class Haha { static function hello(){ echo 'haha hello'; } } ``` ### 執行文件 (test.php) ``` use models\Haha; use util\Hehe; include 'autoload.php'; header("Content-Type: text/html; charset=UTF-8"); Haha::hello(); Hehe::hello(); ``` > 執行結果 > 我來包含!.\models\Haha.php > haha hello > 我來包含!.\util\Hehe.php > hehe hello
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