创建ini文件，用PHP写入值

I cannot find a way that easily lets me create a new file, treat it as an ini file (not php.ini or simiilar... a separate ini file for per user), and create/delete values using PHP. PHP seems to offer no easy way to create an ini file and read/write/delete values. So far, it's all just "read" - nothing about creating entries or manipulating keys/values.I cannot find a way that easily lets me create