Linux uptime command inside php doesn't show anything -


I'm trying a Linux command for uptime in a php file on a server 

 < code> & lt; P & gt; Uptime for this system & lt ;? Php $ up_time = shell_exec ('uptime'); Echo $ uptime; ? & Lt; / P & gt;   
 But when I open my webpage it just shows:  
  uptime for this system   
 PHP is running in command if I go to command prompt and uptime, I can see the result.  
 I am doing SSH in a Linux webserver. The PHP file stays in my folder on the server.   
 
 
 I think the following code will work.  
  uptime for this system & lt ;? php passthru ('/ usr / bin / uptime'); ? & Gt;   
 To execute the system command in a PHP, I suggest that you always provide a full path to the command.

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