通过 exec() 使用时 ls 输出发生变化
我通过 PHP 和 exec() 使用 ls 命令，得到的输出与通过 shell 运行相同命令时得到的输出不同。通过 PHP 运行 ls 时，日期的年份和月份将更改为月份名称：
通过 shell 运行命令：
$ ls -lh /path/to/file
-rw-r--r-- 1 sysadmin sysadmin 36M 2011-05-18 13:25 file
通过 PHP 运行命令：
<?php
exec("ls -lh /path/to/file", $output);
print_r($output);
/*
Array
(
[0] => -rw-r--r-- 1 sysadmin sysadmin 36M May 18 13:25 file
)
*/
请注意：
-当我通过 cli 运行 PHP 脚本时，不会出现此问题（仅在通过 apache 运行时才会出现此问题）
-我检查了页面的源代码，以确保我所看到的就是我所得到的（并且我确实得到了月份名称而不是正确的日期）
-我还以 www-data 用户身份通过 shell 运行 ls 命令，以查看 ls 是否根据用户提供不同的输出（ shell 的输出始终相同，即我得到的是 yyyy-mm-dd 中的日期而不是月份名称）
用答案更新
alias 给了我这：
alias l='ls -CF'
alias la='ls -A'
alias ll='ls -alF'
alias ls='ls --color=auto'
从这些别名中我无法找到直接负责的开关对于时间显示：
-C list entries by columns
-F append indicator (one of */=>@|) to entries
-A do not list implied . and ..
-a do not ignore entries starting with .
-l use a long listing format
但是在 PHP 中使用 --time-style=long-iso 确实解决了这个问题。
I'm using the ls command via PHP and exec() and I get a different output than when I run the same command via the shell. When running ls through PHP the year and month of the date get changed into the month name:
Running the command through the shell:
$ ls -lh /path/to/file
-rw-r--r-- 1 sysadmin sysadmin 36M 2011-05-18 13:25 file
Running the command via PHP:
<?php
exec("ls -lh /path/to/file", $output);
print_r($output);
/*
Array
(
[0] => -rw-r--r-- 1 sysadmin sysadmin 36M May 18 13:25 file
)
*/
Please note that:
-the issue doesn't occur when I run the PHP script via the cli (it only occurs when run through apache)
-I checked the source code of the page to make sure that what I was seeing was what I was getting (and I do get the month name instead of the proper date)
-I also run the ls command through the shell as the www-data user to see if ls was giving different output depending on the user (the output is the always the same from the shell, that is I get the date in yyyy-mm-dd instead of the month name)
Update with answer
alias was giving me this:
alias l='ls -CF'
alias la='ls -A'
alias ll='ls -alF'
alias ls='ls --color=auto'
From those aliases I was unable to find a switch that was directly responsible for the time display:
-C list entries by columns
-F append indicator (one of */=>@|) to entries
-A do not list implied . and ..
-a do not ignore entries starting with .
-l use a long listing format
However using --time-style=long-iso in PHP did fix the issue.
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ls有几个用于日期显示格式的命令行选项。检查您的命令行版本是否没有别名以包含诸如ls --time-style=locale之类的内容。 PHP exec'd 版本很可能没有此别名，并且使用默认的 ls 设置。lshas a couple command line options for date display format. check that your command line version isn't aliased to include something likels --time-style=locale. The PHP exec'd version will most likely not have this aliasing present and is using defaultlssettings.ls输出取决于当前区域设置。当您代表自己从控制台运行它时，它会使用您的区域设置，但用户www-data有自己的区域设置（可能与您的不同）。因此，我建议您明确指定区域设置：您可以替换您想要使用的区域设置，而不是
POSIX。lsoutput depends from current locale settings. When you run it from console on behalf yourself it uses your locale settings, but userwww-datahas own locale settings (which probably differ from your). So, I suggest to you specify locale settings explicitly:where instead of
POSIXyou may substitute locale which you want to use.