PHP executes 6 functions commonly used in Linux commands

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 of files
  
   
   
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
  
   
   
)