Question

can any one please let me know, why i could not get result for the php function

exec('unzip gallery.zip',$return);
print_r($return);

Answer 1

Did you check the return value from unzip? Error messages are not given on standard output stream, so the array will be empty if something fails.

<?php
    $result = array();
    exec("unzip archiv.zip", $result, $returnval);
    print_r($result);
    print_r($returnval);
?>

Does the unzip work as expected? It might ask for overwriting etc. if the files already exist and stop the workflow. This output will not be captured in the result.