Plugin for PHP_CodeSniffer static analysis tool that adds analysis of problematic variable use.

• Performs static analysis of variable use.
• Warns on use of undefined variables.
• Warns if variables are set or declared but never used within that scope.
• Warns if variables are redeclared within same scope.
• Warns if $this, self::$static_member, static::$static_member is used outside class scope.

Run ./install.sh -h to get install help.

For a default install of PHP_Codesniffer via PEAR with PEAR in ~/pear you should be safe to just run ./install.sh to use the default options, then copy the rules from ruleset.xml into your own ruleset.xml.

There's a variety of options to customize the behaviour of VariableAnalysis, take a look at the included ruleset.xml for commented examples of a configuration.

• File scope isn't currently analysed.