Recieving PHP Warning copy(): Filename cannot be empty - php

Question

I am receiving this warning in one of the Wordpress plugins.
copy(): Filename cannot be empty in /wp-content/plugins/nix-gravatar-cache/nf-gravatar-cache.php on line 181
Please help me correct this, if somebody can. I am not very good with PHP. Thanks
Here is the code.
<?php
class NFGC_Gravatar_Cache {
protected $upload_url;
protected $upload_path;
protected $plugin_dir_path;
public $plugin_name = 'NIX Gravatar Cache';
function __construct(){
if ( get_option( 'upload_url_path' ) ) {
$this->upload_url = get_option( 'upload_url_path' );
$this->upload_path = get_option( 'upload_path' );
}
else {
$up_dir = wp_upload_dir();
$this->upload_url = $up_dir['baseurl'];
$this->upload_path = $up_dir['basedir'];
}
$this->plugin_dir_path = plugin_dir_path( __FILE__ );
require_once $this->plugin_dir_path . '/messages.class.php';
NFGC_Messages::init();
$active = get_option( 'nf_c_a_options' );
if ( $active[0]['active'] == 1 ) {
add_filter( 'get_avatar', array( $this,'get_cached_avatar' ), -1000000000, 5 );
}
add_action( 'admin_menu', array( $this,'add_admin_menu' ) );
register_activation_hook( __FILE__, array( $this, 'activate' ) );
$this->init();
register_deactivation_hook( __FILE__, 'deactivate' );
register_uninstall_hook( __FILE__ , 'uninstall' );
if ( !is_writable( $this->upload_path.'/gravatar/' ) && is_dir( $this->upload_path.'/gravatar/' ) ) {
NFGC_Messages::add_message( 'error', 'Please set write permissions for "'. $this->upload_path .'/gravatar/"' );
}else{
if ( #!mkdir( $this->upload_path.'/gravatar/', 0777 ) && ! is_dir( $this->upload_path.'/gravatar/' ) ) {
NFGC_Messages::add_message( 'error', 'Could not create directory "gravatar". Please set write permissions for "'. $this->upload_path .'/gravatar/"' );
}
}
if ( isset ( $_POST['nf_clear_cache'] ) )
$this->clear_cache();
}
public function get_template_path() {
return $this->plugin_dir_path .'template';
}
// Activate plugin and update default option
public function activate() {
$dir = $this->upload_path.'/gravatar/';
// delete_option('nf_c_a_options');
if ( get_option( 'nf_c_a_options' ) == false ) {
$default_options = array('active' => 1,
'ttl_day' => 10,
'ttl_hour' => 0,
'ttl_min' => 0
);
update_option( 'nf_c_a_options', array( $default_options ) );
}
}
// Deactivate plugin and clear cache
public function deactivate() {
$this->clear_cache();
}
// Notice in plugin options page
public function admin_help_notice() {
global $current_screen;
if ( $current_screen->base == 'settings_page_'. basename( __FILE__,'.php' ) ) {
return true;
}
}
// convert ttl option to second
private function cache_to_second(){
$cache_time = get_option( 'nf_c_a_options' );
$cache_time = array_reverse( $cache_time[0] );
$action = array();
foreach ( $cache_time as $key => $value ) {
if ( $key == 'active' )
continue;
switch ( $key ) {
case 'ttl_min':
$cache_second = $value != 0 ? $value*60 : '';
break;
case 'ttl_hour':
$cache_second = $value != 0 ? ( $value*60*60 ) + $cache_second : $cache_second;
break;
case 'ttl_day':
$cache_second = $value != 0 ? ( $value*60*60*24 ) + $cache_second : $cache_second;
break;
}
}
if ( ! $cache_second ) {
$cache_second = 864000;// TTL of cache in seconds (10 days)
}
return $cache_second;
}
// The main functional
public function get_cached_avatar( $source, $id_or_email, $size, $default, $alt ) {
if ( !is_writable( $this->upload_path.'/gravatar/' ) || is_admin() ) {
return $source;
}
$time = $this->cache_to_second();
preg_match('/d=([^&]*)/', $source, $d_tmp);
$g_url_default_sorce = isset($d_tmp[1]) ? $d_tmp[1] : false;
preg_match('/forcedefault=([^&]*)/', $source, $d_tmp);
$g_forcedefault = isset($d_tmp[1]) ? $d_tmp[1] : false;
preg_match('/avatar\/([a-z0-9]+)\?s=(\d+)/', $source, $tmp);
$garvatar_id = $tmp[1];
$file_name = md5($garvatar_id.$g_url_default_sorce);
$g_path = $this->upload_path.'/gravatar/'.$file_name.'-s'.$size.'.jpg';
//* $g_path_default = $this->upload_path.'/gravatar/default'.'-s'.$size.'.jpg';
$g_url = $this->upload_url.'/gravatar/'.$file_name.'-s'.$size.'.jpg';
//* $g_url_default = $this->upload_url.'/gravatar/'.'default'.'-s'.$size.'.jpg';
// Check cache
static $nf_avatars_cache = null;
if ($nf_avatars_cache === null) $nf_avatars_cache = get_option('nf_avatars_cache');
if (! is_array($nf_avatars_cache)) $nf_avatars_cache = array();
if (isset($nf_avatars_cache[$garvatar_id][$size])) {
$g_url = $nf_avatars_cache[$garvatar_id][$size]['url'];
$g_path = $nf_avatars_cache[$garvatar_id][$size]['path'];
}
if (! is_file($g_path) || (time()-filemtime($g_path)) > $time) {
$curl_url = 'https://www.gravatar.com/avatar/'.$garvatar_id.'?s='.$size.'&r=G&d='.$g_url_default_sorce;
$ch = curl_init($curl_url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_VERBOSE, 1);
curl_setopt($ch, CURLOPT_HEADER, 1);
$response = curl_exec($ch);
$header_size = curl_getinfo($ch, CURLINFO_HEADER_SIZE);
$header = substr($response, 0, $header_size);
// Checking for redirect
$header_array = array();
preg_match('/^Location\: (.*)$/m', $header, $header_array);
$redirect_url = isset($header_array[1]) ? $header_array[1] : false;
if ($redirect_url) {
$g_url = $g_url_default;
$g_path = $g_path_default;
if (! is_file($g_path) || (time()-filemtime($g_path)) > $time) {
copy($redirect_url, $g_path);
}
}
else {
// Check mime type
$mime_str = curl_getinfo( $ch, CURLINFO_CONTENT_TYPE );
$mime_array = array();
preg_match( '#/([a-z]*)#i', $mime_str, $mime_array );
if (isset($mime_array[1])) {
// Write cache to file
$fp = fopen( $g_path, "wb" );
$body = substr( $response, $header_size );
fwrite( $fp, $body );
fclose( $fp );
}
}
curl_close($ch);
$nf_avatars_cache[$garvatar_id][$size]['url'] = $g_url;
$nf_avatars_cache[$garvatar_id][$size]['path'] = $g_path;
update_option( 'nf_avatars_cache', $nf_avatars_cache );
}
return '<img alt = "'.$alt.'" src=\''.$g_url.'\' class="avatar avatar-'.$size.'" width="'.$size.'" height="'.$size.'" />';
}
// Create plugin option settings menu
public function add_admin_menu() {
// settings menu page
add_options_page( 'Cached Avatar ', $this->plugin_name, 'manage_options', basename( __FILE__ ), array( $this,'view_options_page' ) );
}
// Create page option
public function view_options_page() {
// update options
if ( isset( $_POST['nf_c_a_submit'] ) ) {
$update_val_options = $_POST['nf_c_a_options'];
foreach ( $update_val_options as $option => $value ) {
$update_val_options[$option] = abs( intval( $value ) );
}
if( $update_val_options['ttl_min'] == 0 && $update_val_options['ttl_hour'] == 0 && $update_val_options['ttl_day'] == 0 ) {
$update_val_options['ttl_day'] = 10;
}
update_option( 'nf_c_a_options', array( $update_val_options ) );
}
$options = get_option( 'nf_c_a_options' );
include( $this->get_template_path() .'/main-options-page.php');
}
private function clear_cache() {
$dir = $this->upload_path.'/gravatar/';
$no_permision_to_delete = false;
// Open directory
if ( is_dir( $dir ) ) {
if ( $opendir = opendir( $dir ) ) {
$count = 0;
while ( ( $file = readdir( $opendir ) ) !== false ) {
if ( filetype( $dir . $file ) == 'file' ) {
if ( #unlink( $dir . $file ) ) {
$count++;
}else {
$no_permision_to_delete = true;
}
}
}
if ( $no_permision_to_delete ) {
NFGC_Messages::add_message( 'error','Unable to clear the cache' );
}else{
update_option('nf_avatars_cache', array() );
NFGC_Messages::add_message( 'info','The cache is cleared!' );
NFGC_Messages::add_message( 'info','Removed '.$count.' files' );
}
closedir( $opendir );
}
}
}
// return count and size
public function get_cache_info() {
$dir = $this->upload_path.'/gravatar/';
$skip = array('.','..');
$unit = array('b', 'kb', 'mb', 'gb', 'tb', 'pb');
if ( is_dir( $dir ) ) {
$file_list = scandir( $dir );
// delete . and ..
foreach ( $skip as $value ) {
unset( $file_list[ array_search( $value, $file_list ) ] );
}
// sum files size
foreach ( $file_list as $file ) {
$size = filesize( $dir . $file );
$all_size = $all_size + $size;
}
}
$readable_form = #round( $all_size / pow( 1024, ( $i = floor( log( $all_size, 1024) ) ) ), 2 ) . ' ' . $unit[$i];
return array( 'amount' => count( $file_list ) , 'used_space' => $readable_form );
}
private function init() {
return false;
wp_enqueue_script( 'nfgc-main-script', plugins_url( '/js/main.js', __FILE__ ), array('jquery') );
wp_enqueue_style( 'nfgc-main-style', plugins_url( '/css/style.css', __FILE__ ) );
}
}// Class
global $nfgc;
$nfgc = new NFGC_Gravatar_Cache();
add_action('wp_enqueue_scripts', function() {
wp_enqueue_script( 'nfgc-main-script', plugins_url( '/js/main.js', __FILE__ ), array('jquery') );
wp_enqueue_style( 'nfgc-main-style', plugins_url( '/css/style.css', __FILE__ ) );
});
`

Answer 1

Try this..
Use file_exists
Returns TRUE if the file or directory specified by filename exists; FALSE otherwise.
if (file_exists($redirect_url)) {
$g_url = $g_url_default;
$g_path = $g_path_default;
if (! is_file($g_path) || (time()-filemtime($g_path)) > $time) {
copy($redirect_url, $g_path);
}
}
http://php.net/manual/en/function.file-exists.php