用composer安裝php代碼（以安裝phpmailer為例）

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1.安裝composer.exe軟體2.下載composer.phar3.建立composer.json檔案 

{    "require": {        "php": ">=5.5.9",        "phpmailer/phpmailer": "~5.2"    },    "config": {        "preferred-install": "dist"    },    "repositories": {        "packagist": {            "type": "composer",            "url": "https://packagist.phpcomposer.com"        }    }}

4.composer.phar和composer.json都放在項目根目錄下5.安裝命令：php composer.char install

用composer安裝php代碼（以安裝phpmailer為例）