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extension_dir is not configured correctly, just change it
extension_dir is a configuration item in php.ini, just change it to the absolute path of your ext directory

-----------------------------An easier way------------- ------------------

composer.phar is actually a Php script, you can actually download it yourself

1. php added to environment variables

2. Download composer.phar(Address: https://getcomposer.org/composer.phar)，將文件放進(jìn)PHP目錄下，并且新建文本文件 composer.cmd，內(nèi)容：@php "%~dp0composer.phar" %*.

3. composer --version Check the composer version to confirm whether the command can be executed. If so, it’s ok