试试吧.
如果模式无效,则
原文链接：https://www.f2er.com/php/137729.html如果模式无效,则
preg_match()将返回FALSE.
Return values: preg_match() returns
the number of times pattern matches.
That will be either 0 times (no match)
or 1 time because preg_match() will
stop searching after the first match.
preg_match_all() on the contrary will
continue until it reaches the end of
subject. preg_match() returns FALSE if an error occurred.
