This is edition version PHPExcel library. Works with mbstring.func_overload=2
in php.ini
Add into composer.json
"require": {
"phpexcel/for_mbstring_func_overload_2": "dev-master"
},
"repositories": [
{
"type": "vcs",
"url": "https://github.com/vladsold/PHPExcel_for_func_overload_2"
}
]
Execute command: composer update