Module 'curl' already loaded in Unknown on line 0

安装 Composer 时遇到以下错误：
PHP Warning:  Module 'curl' already loaded in Unknown on line 0
PHP Warning:  Module 'gd' already loaded in Unknown on line 0
PHP Warning:  Module 'gettext' already loaded in Unknown on line 0
PHP Warning:  Module 'mysqli' already loaded in Unknown on line 0
PHP Warning:  Module 'mbstring' already loaded in Unknown on line 0
PHP Warning:  Module 'openssl' already loaded in Unknown on line 0

引起这个错误的原因就是模块重复定义了，可能你还困惑没有重复定义呀，根本原因就是你无意重复安装了不同版本的php了。只要把不需要的php给卸掉，或者从环境变量中给去掉都可以解决这个错误。也可以在php.ini中把相应的模块给注释掉都可以。
如下所示：

;[PHP_GD2]
;extension=php_gd2.dll
;[PHP_GETTEXT]
;extension=php_gettext.dll
;[PHP_MYSQLI]
;extension=php_mysqli.dll
;[PHP_MBSTRING]
;extension=php_mbstring.dll
;[PHP_OPENSSL]
;extension=php_openssl.dll
;[PHP_SOAP]
;extension=php_soap.dll
[PHP_XMLRPC]
extension=php_xmlrpc.dll

lebang2020.cn

1. composer does not match the expected JSON schema
2. Unable to load dynamic library 'oci8_12c'
3. windows 10 PHPManager 下载和安装