php中exec和system shell_exec区别

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php exec()函数,实例:

 $a=exec("dir",$b,$c);  var_dump($a,$b,$c);

返回结果:

string '               3 个目录 21,346,123,776 可用字节' (length=47)array (size=19)  0 => string ' 驱动器 C 中的卷没有标签。' (length=26)  1 => string ' 卷的序列号是 0002-0979' (length=23)  2 => string '' (length=0)  3 => string ' C:\wamp\www\t 的目录' (length=21)  4 => string '' (length=0)  5 => string '2013/09/10  17:40    <DIR>          .' (length=37)  6 => string '2013/09/10  17:40    <DIR>          ..' (length=38)  7 => string '2013/08/23  21:22               555 .project' (length=44)  8 => string '2013/08/27  14:16    <DIR>          .settings' (length=45)  9 => string '2013/08/29  13:00           255,076 1.jpg' (length=41)  10 => string '2013/08/24  17:32                64 1.php' (length=41)  11 => string '2013/08/29  12:58            56,478 bootstrap.js' (length=48)  12 => string '2013/08/31  02:29            71,542 build.log' (length=45)  13 => string '2013/09/11  07:09                59 index.php' (length=45)  14 => string '2013/09/10  20:33               874 tt.php' (length=42)  15 => string '2013/08/27  16:54               134 yunjin_config.nsh' (length=53)  16 => string '2013/08/27  16:54               935 yun_backup.php' (length=50)  17 => string '               9 个文件        385,717 字节' (length=43)  18 => string '               3 个目录 21,346,123,776 可用字节' (length=47)int 0

$string=system($cmd,$ret)

Returns the last line of the command output on success, and FALSE on failure.