如果该行对于 textarea 很长并且有一个中断，我希望它在其前面放置一个大于号。如何？如您所见，缺少两个greater-than signs
> Vivamus ullamcorper adipiscing bibendum.
>
> Etiam faucibus facilisis tortor,
> in viverra nulla condimentum eu.
> Vivamus eu tellus adipiscing, molestie nisi vel,
malesuada lacus. (wheres the greater-than sign?)
>
> Integer cursus malesuada
consectetur. (wheres the greater-than sign?)
> Curabitur tellus mi, tristique vel urna et, auctor tincidunt augue.
> Cras semper, nisl sodales viverra volutpat.
> Phasellus feugiat quam nec orci
> accumsan gravida ut vitae risus.
我试过这个：rtrim("> ".str_replace("\n", "\n> ", $str), ">\n");