I was struggling with this as well but just got it working.
You need to install phplint which you can download from http://www.icosaedro.it/phplint/download.html
Open up the zip and copy phplint.exe and phpl.bat to your php directory (mine is c:/wamp/bin/php/php5.3.13/)
You also need to have the path to php in your windows path which you can find by right clicking on 'my computer' and properties -> advanced system settings -> environment variables -> system variables -> path
Add the path on the end separated by a ; mine was as above C:\wamp\bin\php\php5.3.13 if you want to use node for js hinting then add the path to node here as well.
I think the linters now get added automatically but you can check in the file:
Preferences -> Package Settings -> SublimeLinter -> Settings - User
Mine looks like this (the relevant parts. If the file is blank copy the contents of the default settings file)
"lint_mode": "background",
"linters": {
"csslint": {
"@disable": false,
"args": [],
"errors": "",
"excludes": [],
"ignore": "",
"warnings": ""
},
"htmltidy": {
"@disable": false,
"args": [],
"excludes": []
},
"jshint": {
"@disable": false,
"args": [],
"excludes": []
},
"php": {
"@disable": false,
"args": [],
"excludes": []
},
"phplint": {
"@disable": false,
"args": [],
"excludes": []
}
},
"mark_style": "outline",
If you then restart it should start linting.