Max File Upload Size

This is a really stupid question, but I've not been able to find an answer for it. I have always thought that your max upload size is limited to the value in the php.ini file. However I recently changed a site to a new server which had problems with memory on one of the image resizing scripts. I managed to work around it by inserting one line at the start of the problem script: ini_set("memory_limit","32M"); Can a similar thing be done with the upload_max_filesize? Assuming that it can't, what is a good workaround? Using FTP within a script? This is for uploading an audio file, typically 4MB. Thanks in advance, Tom