Results for it might be translation from Chinese (Simplified) to English

(no version information, might be only in cvs)
(no version information, might be only in cvs)

might be a back reference, or another way of writing a tab
the quantifier {0} is permitted, causing the expression to behave as if the previous item and the quantifier were not present.

returns the number of full pattern matches (which might be zero), or false if an error occurred.
returns the number of full pattern matches (which might be zero), or false if an error occurred.

蛁: although this function will not perform the conversion, some internal stream state *might* be changed by this call.
note:

alsa 默认输出this string is only shown when the kde runtime is broken. the technical term 'platform plugin' might help users to find a solution, so it might make sense to leave that term untranslated.
alsa default output

if you're unfamiliar with m4 files (now is certainly a good time to get familiar), this might be a bit confusing at first; but it's actually quite easy.
if you' re unfamiliar with m4 files (now is certainly a good time to get familiar), this might be a bit confusing at first; but it's actually quite easy.

those unfamiliar with socket programming can find a lot of useful material in the appropriate unix man pages, and there is a great deal of tutorial information on socket programming in c on the web, much of which can be applied, with slight modifications, to socket programming in php. the unix socket faq might be a good start.
the socket functions described here are part of an extension to php which must be enabled at compile time by giving the --enable-sockets option to configure.

escapeshellcmd() escapes any characters in a string that might be used to trick a shell command into executing arbitrary commands. this function should be used to make sure that any data coming from user input is escaped before this data is passed to the exec() or system() functions, or to the backtick operator. a standard use would be:
this function should be used to make sure that any data coming from user input is escaped before this data is passed to the exec() or system() functions, or to the backtick operator.