PHP字符串內調用函數的方式

"{$o0_0o{phpinfo()}}"
1
"{$我勒個去[phpinfo()]}"

"${~-~phpinfo()}"

"${0e0+phpinfo()}"
What fuck?

<?php

<<<我是好人

$→_→${$←_←{pHPINfo(~@-@~-$$總之，我是好人)}}

我是好人;

?>
我簡單整理了下規則:

可變變量

" ${phpinfo()} "

" ${@phpinfo()} "

" ${${phpinfo()} }"

" ${{0x00-0x20}phpinfo()} "

" ${{邏輯||運算}phpinfo()} "

數組索引

" {${合法變量名}[phpinfo()]} "

" {${合法變量名}{phpinfo()}} "