Warning: `exec()` has been disabled for security reasons [duplicate]

Question

This question already has an answer here:

• Warning: exec() has been disabled for security reasons 2 answers

I upload a gif to my website. When is upload complete, i can see this error:

Warning: exec() has been disabled for security reasons in /data/web/virtuals/28995/virtual/www/include/functions/main.php on line 306

Fatal error: Call to undefined function execute() in /data/web/virtuals/28995/virtual/www/include/functions/main.php on line 309

And this is part from main.php

$owh = $width_old."x".$height_old;
$nwh = $final_width."x".$final_height;
if(!file_exists($temppic))
{
    $runinbg = "convert ".$file." -coalesce ".$temppic;
    $runconvert = execute("$runinbg");
}
$runinbg = "convert -size ".$owh." ".$temppic." -resize ".$nwh." ".$output;
$runconvert = execute("$runinbg");
return true;

Thank you for help! :-)

Answer 1

Just as additional information:

There is a php.ini directive called disable_functions. Functions added to this list will be disabled by PHP and when you try to execute those functions, you get this error. As mentioned, in all probability your hosting provider has added exec to the disabled list. This is a common practice in shared hosting. You will need a dedicated server if you really want to run exec (or some hosting provider who provides pseudo-exec functionality). It is a bad idea to trust a shared hosting provider who allows you to run exec unrestrained.

Answer 2

Those errors mean just what they say.

Fatal error: Call to undefined function execute() 

You are calling a function that doesn't exist.

Warning: exec() has been disabled for security reasons

Your web host has disabled the exec() method, you won't be able to run background scripts (like it appears you are attempting to do). You'll need to find another way to accomplish your goal, or find another web host.