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                ### 如何安裝 Composer包依賴管理程序 * * * * * #### 下載 Composer 安裝前請務必確保已經正確安裝了 PHP。打開命令行窗口并執行 php -v 查看是否正確輸出版本號。 打開命令行并依次執行下列命令安裝最新版本的 Composer: ~~~ php -r "copy('https://install.phpcomposer.com/installer', 'composer-setup.php');" php composer-setup.php php -r "unlink('composer-setup.php');" ~~~ 執行第一條命令下載下來的 composer-setup.php 腳本將簡單地檢測 php.ini 中的參數設置,如果某些參數未正確設置則會給出警告;然后下載最新版本的 composer.phar 文件到當前目錄。 上述 3 條命令的作用依次是: 1. 下載安裝腳本 - composer-setup.php - 到當前目錄。 2. 執行安裝過程。 3. 刪除安裝腳本。 #### 局部安裝 上述下載 Composer 的過程正確執行完畢后,可以將 composer.phar 文件復制到任意目錄(比如項目根目錄下),然后通過 php composer.phar 指令即可使用 Composer 了! #### 全局安裝 全局安裝是將 Composer 安裝到系統環境變量 PATH 所包含的路徑下面,然后就能夠在命令行窗口中直接執行 composer 命令了。 ###### Mac 或 Linux 系統: 打開命令行窗口并執行如下命令將前面下載的 composer.phar 文件移動到 /usr/local/bin/ 目錄下面: ~~~ sudo mv composer.phar /usr/local/bin/composer ~~~ ###### Windows 系統: 找到并進入 PHP 的安裝目錄(和你在命令行中執行的 php 指令應該是同一套 PHP)。 將 composer.phar 復制到 PHP 的安裝目錄下面,也就是和 php.exe 在同一級目錄。 在 PHP 安裝目錄下新建一個 composer.bat 文件,并將下列代碼保存到此文件中。 ~~~ @php "%~dp0composer.phar" %* ~~~ 最后重新打開一個命令行窗口試一試執行 composer --version 看看是否正確輸出版本號。 #### 最后 提示:不要忘了經常執行 `composer selfupdate` 以保持 Composer 一直是最新版本哦! * * * * * #### 問題 報錯: ~~~ D:\phpStudy\PHPTutorial\php\php-7.2.1-nts>php -r "copy('https://install.phpcompo ser.com/installer', 'composer-setup.php');" PHP Warning: copy(): Unable to find the wrapper "https" - did you forget to ena ble it when you configured PHP? in Command line code on line 1 Warning: copy(): Unable to find the wrapper "https" - did you forget to enable i t when you configured PHP? in Command line code on line 1 PHP Warning: copy(): Unable to find the wrapper "https" - did you forget to ena ble it when you configured PHP? in Command line code on line 1 Warning: copy(): Unable to find the wrapper "https" - did you forget to enable i t when you configured PHP? in Command line code on line 1 PHP Warning: copy(https://install.phpcomposer.com/installer): failed to open st ream: No such file or directory in Command line code on line 1 Warning: copy(https://install.phpcomposer.com/installer): failed to open stream: No such file or directory in Command line code on line 1 ~~~ #### 解決 php.ini中把extension=php_openssl.dll前面的“;”刪掉就行了 ~~~ D:\phpStudy\PHPTutorial\php\php-7.2.1-nts>php -r "copy('https://install.phpcomposer.com/installer', 'composer-setup.php');" D:\phpStudy\PHPTutorial\php\php-7.2.1-nts>php composer-setup.php All settings correct for using Composer Downloading... Composer (version 1.6.5) successfully installed to: D:\phpStudy\PHPTutorial\php\php-7.2.1-nts\composer.phar Use it: php composer.phar D:\phpStudy\PHPTutorial\php\php-7.2.1-nts>php -r "unlink('composer-setup.php');" ~~~
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