- print_r: documentation ( source)
<?php
@$_[]=@!+_;$__=@${_}>>$_;$_[]=$__;$_[]=@_;$_[((++$__)+($__++))].=$_;
$_[]=++$__;$_[]=$_[--$__][$__>>$__];$_[$__].=(($__+$__)+$_[$__-$__]).($__+$__+$__)+$_[$__-$__];
$_[$__+$__]=($_[$__][$__>>$__]).($_[$__][$__]^$_[$__][($__<<$__)-$__]);
$_[$__+$__].=($_[$__][($__<<$__)-($__/$__)])^($_[$__][$__]);
$_[$__+$__].=($_[$__][$__+$__])^$_[$__][($__<<$__)-$__];
$_=$
$_[$__+$__];
print_r($_);
//$_[@-_]($_[@!+_]);
?>