从php脚本访问该文件的权限被拒绝

I have shared library file client.so. Which works fine in command line. I am trying to run it using exec().

client takes one string argument as a input. like ./client "this is nice" code is:

 $s="hello"; 
 escapeshellarg($s); 
 $a=exec('/home/technoworld/Videos/LinSocket "./client $s"'); 

also

 $a=exec('/home/technoworld/Videos/LinSocket "./client "Nice bad" "'); 

It gives error:

sh: 1: /home/technoworld/Videos/LinSocket: Permission denied

I tried changing the chmod all I found on web and other relevant changes. But no change. Any kind of help is highly appreciated!

After setting the permission execute in following manner will solve the problem:

$a=exec('/home/technoworld/Videos/LinSocket/client "critic good"'); 

client is the executable file that I wanted to execute and "critic good" is argument to be passed!