PHP modifies the contents of the php file

Give this PHP a try ::(sweat)
Pass in four parameters, file name, variable, value, and data type that need to be matched.
The fourth value can be left blank ::(Sharp)

// 保存配置函数
function update_config($file, $ini, $value,$type="string"){
    if(!file_exists($file)) return false;
    $str = file_get_contents($file);
    $str2="";
    if($type=="int"){  
        $str2 = preg_replace("/'".preg_quote($ini)."' => (.*),/", "'".$ini."' => '".$value."',",$str);
    }
    else{
        $str2 = preg_replace("/'".preg_quote($ini)."' => '(.*)',/","'".$ini."' => '".$value."',",$str);
    }
    file_put_contents($file, $str2);
    return true;
}