1. strr(i)pos() now uses the full needle when searching - be aware that code that previous have run now can stop working.
   EX :
   <?php
   var_dump(strrpos("ABCDEF","DEF"));
   var_dump(strrpos("ABCDEF","DAF"));
   ?>
   Will give you differents results. The diffence is in the second cal to strrpos(). The same applies and for strripos().
2. Change illegal use of string offset from E_WARNING to E_ERROR
3. array_merge() accepts only arrays. If non-array is passed a E_WARNING for every non-array
   parameter will be throwed. Be careful because your code may start emitting E_WARNING out of the blue.