Open this php.ini file in any text editor and locate the section "File Uploads", now in this section, first, you need to enable the upload of file by modifying the variable "file_uploads = On" and next you can increase the upload limit to any value that you may required by modifying the value of "upload_max_filesize = 20M".
As you can see here in my case I have made the limit to 20MB, you can put your any required value here and restart the apache server to take the effect.
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source:http://linuxpoison.blogspot.com/2008/04/13578175808690.html