php - Execute symfony task command from the shell_exec() permission denied -

I have a "doNothing" Symphony Task call and I want to execute it as shell_exec ('/ var / www') I want to execute from / Symfony php symfony doNothing ');

Calling my symfony action

Apache refused to say the error

I think the www-data The user is not allowed to solve this.

Edit

  Error   
 sh: / var / www / esm / symfony: Permission denied   
 
 
 You should look in the directory where your script is.  
 Use  ls -la  to display all the files in the folder and their permissions (to execute a php script file)  x  bit is assigned to www-data or its group.)  
 In addition to  /  in all the original directories, for  x  apache The user assigned to the group that is able to change the directory.  
 Look. You have a tree structured file system:  
 
 In  / var / www   / var   
  / Var / www / esm  in  / var / www   
 In  / var / www / esm / symfony   / var / Www / esm    
 Then the www-data user should be able to execute all those directories ( x  bit).  
 Then when execute  /  to  LS-L  and  x  on Victor  / var>  See www for bit- Data users or groups (drw  x  rw  x  ---) and this is the owner of this directory. When  ls -l  is executed in  / var  ...  
 You can change the permissions on 777 for each directory. But do not use the  -R  key simply change the permissions in the directory.