// multiple upload function
public function dpwap_plugin_multiple_upload_func()
{
$dpwapObj = new Dpwapuploader();
$plugin_multiple_upload_file = DPWAP_DIR . DS . 'app' . DS .
'Plugins' . DS . 'templates' . DS . 'multiple_upload_plugin.php';
include_once $plugin_multiple_upload_file;
}

...
...
<div class="inside">
    <?php
        if (isset($_POST['dpwap_locInstall']) && $_FILES['dpwap_locFiles']['name'][0] != ""){
        echo '<form id="form_alldpwap" name="form_alldpwap" method="post" action="admin.php?page=activate-status">';
        echo "<div class='dpwap_main'>";
        $dpwapObj->dpwap_plugin_locInstall();
        echo "</div>";
        echo '<input class="button button-primary dpwap_allactive"
type="submit" name="dpwap_locInstall" onclick="activateAllPLugins()"
value="'. esc_attr__('Activate all', 'download-plugin').'">';
        echo '</form>';
        }
    ?>
</div>
...
...

public function dpwap_plugin_locInstall(){
// Increase the resources
@ini_set( 'memory_limit', '1024M' );
@ini_set( 'upload_max_filesize', '640M' );
@ini_set( 'post_max_size', '640M' );
check_admin_referer( $this->key );
echo '<div class="dpwap_h3">'.esc_html__( 'Installing Plugins',
'download-plugin' ) .':</div>';
for ( $i = 0; $i < count( $_FILES['dpwap_locFiles']['name'] ); $i++
) {
$dpwap_locFilenm = sanitize_file_name($_FILES['dpwap_locFiles']
['name'][$i]);
if ( strpos( $dpwap_locFilenm, 'mpipluginsbackup' ) === false )
{
//Get the temp file path
$tmpFilePath = $_FILES['dpwap_locFiles']['tmp_name'][$i];
//Make sure we have a filepath
if ( $tmpFilePath != "" ) {
//Setup our new file path
$newFilePath =
DPWAPUPLOADDIR_PATH.'/dpwap_logs/files/tmp/' . $dpwap_locFilenm;
//Upload the file into the temp dir
if( @move_uploaded_file( $tmpFilePath, $newFilePath ) )
{
$dpwap_tempurls[] =
DPWAPUPLOADDIR_PATH.'/dpwap_logs/files/tmp/'.$dpwap_locFilenm;
}
}
}
else{
echo esc_html__('This is', 'download-plugin') .'
<b>'.esc_html($dpwap_locFilenm).'</b> '.esc_html__( 'not a valid zip
archive.', 'download-plugin' );
}
}
if( $dpwap_tempurls )
$this->dpwap_get_packages( $dpwap_tempurls, "activate", "nocreate",
"upload_locFiles" );
}