mysqldump common install locations for mac/linux

I am trying to know all the common locations for mysqldump. The list I have come up with is as follows:

'/usr/bin/mysqldump', //Linux
'/usr/local/mysql/bin/mysqldump', //Mac OS X
'/usr/local/bin/mysqldump', //Linux
'/usr/mysql/bin/mysqldump'; //Linux

Often mysqldump isn't in the path, so I am trying to have all the locations to look in. (I am running this from a php script)

Are there any that I am missing?