Laravel requires the Mcrypt PHP extension 解决方案

在composer.json文件中加入，

"require": {
	"laravel/framework": "4.0.*",
        "neoxia/laravel-openssl-encryption": "1.0.*"
},

命令行中

php composer.phar update  

修改 vendor/laravel/framework/src/Illuminate/Foundation/start.php文件，替换扩展检查内容

/*
|--------------------------------------------------------------------------
| Check Extensions
|--------------------------------------------------------------------------
|
| Laravel requires a few extensions to function. Here we will check the
| loaded extensions to make sure they are present. If not we'll just
| bail from here. Otherwise, Composer will crazily fall back code.
|
*/

if ( ! ( extension_loaded('mcrypt') or extension_loaded('openssl') ) )
{
    die('Laravel requires one of the Mcrypt or Openssl PHP extension.'.PHP_EOL);

    exit(1);
}

尝试 php artisan migrate:make create_users_table 不会再提示 Laravel requires the Mcrypt PHP extension

第二种更简单的办法，直接修改 vendor/laravel/framework/src/Illuminate/Foundation/start.php文件，将上段中扩展读取的相关代码全部注释掉。这种只能在方便调试的时候用，毕竟还是不可靠的做法。