Composer无法安装依赖项

Question

我有一个FuelPhp项目，我正在尝试通过composer安装依赖项。 当我在命令行上运行composer install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.   

我安装并启用了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

这是来自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"
}

Answer 1

^0.0.0版本约束意味着Composer不会安装0.0.*版本之外的任何内容。

使用"ext-mbstring": "*"作为版本约束，安装应正确传递。