可以使用的命令: popen fpassthru shell_exec exec system 1.popen resource popen ( string command, string mode ) 打开一个指向进程的管道,该进程由派生给定的 command 命令执行而产生。 返回一个和 fopen() 所返回的相同的文件指针,只不过它是单向的
可以使用的命令:
popen
fpassthru
shell_exec
exec
system
1.popen
resource popen ( string command, string mode )
打开一个指向进程的管道,该进程由派生给定的 command 命令执行而产生。
返回一个和 fopen() 所返回的相同的文件指针,只不过它是单向的(只能用于读或写)并且必须用 pclose() 来关闭。此指针可以用于 fgets() ,fgetss() 和 fwrite() 。
如果出错返回 FALSE 。
2.shell_exec
string shell_exec ( string cmd )
执行cmd命令,命令的结果存在返回结果中;
本函数在安全模式 下被禁用。
3.exec
string exec ( string command [, array &output [, int &return_var]] )
参数:
command
将要执行的命令
output
如果指定了output参数,则对应的array数组将会填满该命令输出的每一行。
return_var
如果指定了return_var参数,注意,return_var参数只有output参数被设定后才能指定,那么该命令的执行状态将会以结果参数的形式返回给该变量。
返回值:
返回改名了的最后一行结果。
范例
例子 1. An exec() example
[root@south4 demo]# vi test.php
#!/usr/bin/php -q
exec('ls /etc',$results,$ret);
echo $results[5] . "/n";
echo $results[12]. "/n";
echo $results[3]. "/n";
echo $ret;
?>
[root@south4 demo]# ./test.php
aliases
audit
adjtime
0
4.system
string system ( string command [, int &return_var] )
system是开一个bash进程的,执行完毕之后,就会释放,如下就会达不到目的:
system("cd /home/y/share/NBHadoop/scripts");
system("sudo -u yahoo ./nb_halfhourly.sh $yes_halfHour");
可以写成:
system("cd /home/y/share/NBHadoop/scripts;sudo -u yahoo ./nb_halfhourly.sh $yes_halfHour");

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