The difference between the exec function and the shell_exec function in PHP, execshell_exec
These two functions are both functions for executing Linux commands. The difference is that the return results are different. exec can only get the last line of data, while shell_execu can get all the data.
If there are the following files in the script path:
Copy code The code is as follows:
-bash-4.1# ll
Total usage 12
-rw-rw-r--. 1 www web 133 July 16 15:00 a.php
-rw-r--r--. 1 lee web 59 February 29 17:05 b.php
-rw-r--r--. 1 lee web 81 March 8 17:00 c.php
exec example
Copy code The code is as follows:
/**
* The difference between exec and shell_exec
* Qiongtai Blog
*/
$data = exec('/bin/ls -l');
echo '
';<br>
print_r($data);<br>
echo '
';
?>
Execution results
Copy code The code is as follows:
-rw-r--r--. 1 lee web 81 Mar 8 17:00 c.php
shell_exec example
Copy code The code is as follows:
/**
* The difference between exec and shell_exec
* Qiongtai Blog
*/
$data = shell_exec('/bin/ls -l');
echo '
';<br>
print_r($data);<br>
echo '
';
?>
Execution results
Copy code The code is as follows:
total 12
-rw-rw-r--. 1 www web 139 Jul 16 2012 a.php
-rw-r--r--. 1 lee web 59 Feb 29 17:05 b.php
-rw-r--r--. 1 lee web 81 Mar 8 17:00 c.php
So those who usually use the exec function should pay attention. If you need to get all the return information, you should use the shell_exec function. Of course, if the command execution result only has one line of return information, it doesn't matter which one you use.
shell_exec("/usr/local/bin/pdf2swf /home/xiazai/03.pdf -o /home/xiazai/1.swf; /usr/local/bin/jpeg2swf /home/xiazai/2.jpg -o /home /xiazai/2.swf ");
Add a semicolon after each command
The first thing is to turn off the safe mode safe_mode = off
Then look at the list of disabled functions
disable_functions = proc_open, popen, exec, system, shell_exec, passthru
Here it is Remove exec
Restart apache and it will be OK
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