PHP execute Linux Command common function summary _php instance

In general, PHP is rarely used to execute Linux commands, but you might use them in special cases. I used to know that there are two functions that can execute Linux commands, one is exec, the other is shell_exec. In fact, there are many, combined with the contents of the manual, introduced the following 6 functions.

1,exec function

<?php 
$test = "Ls/tmp/test";//ls is the directory under Linux, the command
exec ($test, $array);//execute Command
print_r ($array);
? >

The returned results are as follows:

[Root@krlcgcms01 shell]# php./exec.php 
Array 
( 
[0] => 1001.log 
[1] => 10.log 
[2] => 10.tar.gz 
[3] => aaa.tar.gz 
[4] => mytest 
[5] => test1101 
[6] => test1102 
[7] = > weblog_2010_09 
)

2,system function

<?php 
$test = "Ls/tmp/test";
$last = System ($test);
Print "Last: $last \ n";
? >

return Result:

[Root@krlcgcms01 shell]# php system.php 
1001.log 
10.log 
10.tar.gz 
aaa.tar.gz 
mytest 
test1101 
test1102 
weblog_2010_09 
last:weblog_2010_09

3,passthru function

<?php 
$test = "Ls/tmp/test";
PassThru ($test);
? >

4,popen function

<?php 
$test = "Ls/tmp/test";
$fp = Popen ($test, "R"); Popen play a process channel while

(!feof ($fp)) {//get something from the channel
$out = fgets ($fp, 4096);
Echo $out; Print out
} 
pclose ($fp);
? >

5,proc_open function

<?php 
$test = "Ls/tmp/test";
$array = Array (
array ("Pipe", "R"),/Standard input 
Array ("Pipe", "w"),//Standard output 
Array ("Pipe", "w")/Standard output error 
); 
$fp = Proc_open ($test, $array, $pipes); Open a process channel
echo stream_get_contents ($pipes [1]);//Why $pipes[1] because 1 is the output
proc_close ($fp);
? >

6,shell_exec function

<?php 
$test = "Ls/tmp/test";
$out = Shell_exec ($test);
echo $out;
? >

The results of the popen,passthru,proc_open,shell_exec return are as follows:

[Root@krlcgcms01 shell]# php test.php 
1001.log 
10.log 
10.tar.gz 
aaa.tar.gz 
mytest 
test1101 
test1102 
weblog_2010_09

I can find on these several functions, can carry out the commands under Linux, I think there should be, welcome to add.