I think you mean:

$a=116.110.101;$b=112.114.101;$c=115.108.97;$d=116.097.102;$g=32.00.00
+;reverse($a);reverse($b);reverse($c);reverse($d);$e=$a.$b.$c.$d;$e=re
+verse($e);print$e.$g;@z=split(//,$e);$f=119.121.111.117;@n=split(//,$
+f);print$z[8].$n[0].$z[10].$z[5].$g.$n[1].$n[2].$n[3]."\n"; print"A P
+D work.\n";
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(I added the missing square brackets and a missing dollar sign.)