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    \$\begingroup\$ Is shorter if you not declare those functions: $m='array_map';echo join($m("chr",$m("bindec",$m(function($v){return strtr($v,[1,0]);},$m("strrev",$m("decbin",$m("ord",str_split($s))))))));. \$\endgroup\$ Commented Nov 6, 2015 at 16:24
  • \$\begingroup\$ @manatwork completely forgot about that. Thanks. \$\endgroup\$ Commented Nov 6, 2015 at 16:27
  • \$\begingroup\$ You can't just put the input in a variable. You should create a function or read the input from STDIN. By the way, you don't need to use quotes around string ("chr", "bindec", …) since we don't care about warnings. That should save you 12 bytes. \$\endgroup\$ Commented Nov 7, 2015 at 11:50
  • \$\begingroup\$ @Blackhole thanks for the infos, I'll be aware of that next time. \$\endgroup\$ Commented Nov 7, 2015 at 13:40
  • \$\begingroup\$ You'd better do the modification on this answer, which is otherwise invalid :) . It will cost you almost no bytes, just replace str_split($s) with str_split(fgets(STDIN)) for instance. \$\endgroup\$ Commented Nov 7, 2015 at 17:57