sorting and searching an Array

After I read this file into an array (small sample of file below) I need to sorted it by the name at the end of each line and then echo out only the ones that the name equals the name in a search variable. Also could somebody recommend a PHP book that covers a lot of info on working with text files. It seams to be very little info in any of the boos I have now. It is sort of skipped over a lot mrgouldian@www.mrgouldian.com mrgouldian webmaster@www.mydomain.com myname info@www.mrgouldian.com mrgouldian webmaster@www.mrgouldian.com mrgouldian suport@www.mydomain.com myname fred@www.mrgouldian.com mrgouldian sales@www.mydomain.com myname info@www.mydomain.com myname gary@www.mrgouldian.com mrgouldian myname@www.mydomain.com myname