That's the php styles from Notepad++. Geshi's seems to be a bit more detailed (more colours and stuff). Good luck
.
xml code:
<LexerType name="php" desc="php" ext="">
<WordsStyle name="QUESTION MARK" styleID="18" fgColor="FF0000" bgColor="FDF8E3" fontName="" fontStyle="0" fontSize="" />
<WordsStyle name="DEFAULT" styleID="118" fgColor="000000" bgColor="FEFCF5" fontName="" fontStyle="0" fontSize="" />
<WordsStyle name="STRING" styleID="119" fgColor="808080" bgColor="FEFCF5" fontName="" fontStyle="0" fontSize="" />
<WordsStyle name="STRING VARIABLE" styleID="126" fgColor="808080" bgColor="FEFCF5" fontName="" fontStyle="1" fontSize="" />
<WordsStyle name="SIMPLESTRING" styleID="120" fgColor="808080" bgColor="FEFCF5" fontName="" fontStyle="0" fontSize="" />
<WordsStyle name="WORD" styleID="121" fgColor="0000FF" bgColor="FEFCF5" fontName="" fontStyle="1" fontSize="" keywordClass="instre1" />
<WordsStyle name="NUMBER" styleID="122" fgColor="FF8000" bgColor="FEFCF5" fontName="" fontStyle="0" fontSize="" />
<WordsStyle name="VARIABLE" styleID="123" fgColor="000080" bgColor="FEFCF5" fontName="" fontStyle="0" fontSize="" />
<WordsStyle name="COMMENT" styleID="124" fgColor="008000" bgColor="FEFCF5" fontName="Comic Sans MS" fontStyle="0" fontSize="8" />
<WordsStyle name="COMMENTLINE" styleID="125" fgColor="008000" bgColor="FEFCF5" fontName="Comic Sans MS" fontStyle="0" fontSize="8" />
<WordsStyle name="OPERATOR" styleID="127" fgColor="8000FF" bgColor="FEFCF5" fontName="" fontStyle="0" fontSize="" />
</LexerType>