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Quercus has a strict mode which reports errors when attempting to execute certain questionable code, e.g.

* Case insensitive function calls (foo() versus FOO())
* Declaring the same argument twice in a function
* Using a bare assignment expression in an if statement

To enable strict mode in Resin:

  <servlet-mapping url-pattern="*.php"
                   servlet-class="com.caucho.quercus.servlet.QuercusServlet">
    <init strict="true"/>
  </servlet-mapping>