Composer php 编写器无法安装依赖项

Composer php 编写器无法安装依赖项,composer-php,mbstring,Composer Php,Mbstring,我有一个FuelPhp项目,我正试图通过composer安装依赖项。 当我在命令行上运行composer安装时,我得到以下错误: The requested PHP extension ext-mbstring ^0.0.0 has the wrong version (7.0.18) installed. Install or enable PHP's mbstring extension. 我已安装并启用mbstring扩展。为什么作曲家抱怨ext-mbstring扩展 作曲家版本

我有一个FuelPhp项目,我正试图通过composer安装依赖项。 当我在命令行上运行composer安装时,我得到以下错误:

 The requested PHP extension ext-mbstring ^0.0.0 has the wrong version (7.0.18) installed. Install or enable PHP's mbstring extension.   
我已安装并启用mbstring扩展。为什么作曲家抱怨ext-mbstring扩展

作曲家版本:1.6.3 Php版本:7.0.18 操作系统:Windows 10

这来自composer.json

   "require": {
    "php": ">=5.3.3",
    "composer/installers": "~1.0",
    "fuel/docs": "dev-1.7/master",
    "fuel/core": "dev-1.7/master",
    "fuel/auth": "dev-1.7/master",
    "fuel/email": "dev-1.7/master",
    "fuel/oil": "dev-1.7/master",
    "fuel/orm": "dev-1.7/master",
    "fuel/parser": "dev-1.7/master",
    "trait-orm-format": "dev-master",
    "fuelphp/upload": "2.0.2",
    "monolog/monolog": "1.5.*",
    "michelf/php-markdown": "1.4.0",
    "ext-mbstring": "^0.0.0"
}

^0.0.0
版本约束意味着Composer不会安装任何超出
0.0.*
版本的内容

使用
“ext mbstring”:“*”
作为版本约束,安装应正确通过