How would I go about creating a php script to execute a shell command to write text to another php file?

Question

How would I go about creating a php script to execute a shell command to write text to another php file? and not have any sudo problems. I have this so far.

<?php
include("inc/config.php");
$command = "sed -i '$ a\this is line 2 without redirection' admin.php";
$command1 = "cat admin.php";
$output = shell_exec($command);
$output1 = shell_exec($command1);
echo "<pre>$output</pre>";
echo "<pre>$output1</pre>";
?>

and I used chown wwwdata and chmod 777

Answer 1

Your script needs to run under an account that has permissions to do everything you need to do. It's that simple.