pclose

(PHP 4, PHP 5)

pclose — 关闭进程文件指针

说明

int pclose ( resource $handle )

关闭用 popen() 打开的指向管道的文件指针。

文件指针必须有效，且必须是成功调用 popen() 所返回的。

返回运行的进程的终止状态。

参见 popen()。

PHP手册 - N: 关闭进程文件指针

用户评论:

Mike (07-Apr-2008 07:55)

The termination status, as pointed out in another note, is not the same as the exit status from the process. However, something like "pclose($fp)/256" is not the correct way to extract the exit status, since this uses system- and version-specific knowledge of where in the termination status the exit status is stored. (Also, the process may not even have exited normally, so it may not have an exit status at all.) Instead, the functions pcntl_wifexited() and pcntl_wexitstatus() should be used. They are wrappers for the C macros WIFEXITED() and WEXITSTATUS() that are designed for determining whether the process had an exit status and what that status was, respectively.

chad 0x40 herballure 0x2e com (04-Sep-2007 09:16)

Warning: If you're reading a command with infinite output, such as 'vmstat 2', pclose will cause the script to hang. This is because pclose waits for the command to exit, in order to return the exit status. If the process never exits, pclose never returns.

kcross at nssolutions dot com (16-Jul-2003 10:08)

Somewhere between 4.1.1 and 4.2.3, the return value from pclose changed. The exit status used to be in the second byte, so that the status would be (pclose($fp)/256). It is now in the low-order byte, so the status is just pclose($fp). Be careful.

vdweij at mailsurf dot com (12-Mar-2003 03:18)

As I understand pclose will return 0 (on every platform) in case popen could not execute the specified command. Since popen only returns the status wether it was able to send a command and not wether it was succesfully executed. Only the returned value of pclose can be used to check wether a command could be executed.

roel at bouwman dot net (07-Oct-1999 06:23)

The return value of pclose() is not the exit status of the program, but a value as returned by waitpid() of wait4(). To obtain the exit status: $ret=(pclose($f)>>8)&0xFF;