如何破解这段PHP代码！

把eval修改为exit，运行一下就能看到源码，比如第一句eval运行后显示的等效代码如下：

$IIIIIII11I1l='is_file';$IIIIIII1l1l1='intval';$IIIIIIIIlI1I='preg_match_all';$IIIIIIII1I1l='basename';$IIIIIIIIlII1='strstr';$IIIIIII1lll1='eregi';$IIIIIII1lI1l='ceil';$IIIIIII1lIIl='is_writable';$IIIIIII1lIII='chmod';$IIIIIII1I111='ftruncate';$IIIIIII1I11l='fputs';$IIIIIII1I11I='touch';$IIIIIII1I1I1='filesize';$IIIIIII1I1Il='fread';$IIIIIII1Il11='flock';$IIIIIII1Il1l='fopen';$IIIIIII1IlII='fclose';$IIIIIII1II11='fgets';$IIIIIII1II1I='feof';$IIIIIII1IIl1='fwrite';$IIIIIII1IIII='fsockopen';$IIIIIIIl11ll='parse_url';$IIIIIIIIlI11='ereg';$IIIIIIIl11lI='strtoupper';$IIIIIIIIl1l1='trim';$IIIIIIIl1l1I='preg_match';$IIIIIIIlI1ll='copy';$IIIIIIIIIl11='implode';$IIIIIIIl1lll='file';$IIIIIIII1II1='substr';$IIIIIIIl1lI1='strpos';$IIIIIIIIl11l='preg_replace';$IIIIIIIIIlll='explode';$IIIIIIIl1Il1='rand';$IIIIIIIl1II1='array_rand';