【THE THOR】AMPエラー対処法！『属性「fetchpriority」はタグ「amp-img」で使用できません』

function gnr_tail_pattern_matched($target, $pattern) {
if (empty($target) && empty($pattern)) {
return true;
} else if (empty($target)) {
return false;
} else if (empty($pattern)) {
return false;
}
$s_end = strlen($target);
$s_len = strlen($pattern);
$offset = $s_end - $s_len;
if ($offset < 0) {
return false;
}
$pos = strpos($target, $pattern, $offset);
return $pos === $offset;
}
////AMPページか否か判定する
function gnr_is_amp() {
if (function_exists('is_amp') && is_amp()) {
return true;
} else if (function_exists('is_amp_endpoint') && is_amp_endpoint()) {
return true;
} else if (function_exists('ampforwp_is_amp_endpoint') && ampforwp_is_amp_endpoint()) {
return true;
} else if (@$_GET['amp'] === '1') {
return true;
} else if (@$_GET['type'] === 'AMP') {
return true;
}
$uri = gnr_get_uri_full();
return gnr_is_amp_pattern($uri);
}
function gnr_is_amp_pattern($uri) {
if (gnr_tail_pattern_matched($uri, '/amp')) return true;
if (gnr_tail_pattern_matched($uri, '/amp/')) return true;
if (gnr_tail_pattern_matched($uri, '?amp=1')) return true;
if (gnr_tail_pattern_matched($uri, 'type=AMP')) return true;
return false;
}
function gnr_get_uri_full() {
return (isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] != 'off' ? 'https' : 'http')
. '://'
. $_SERVER['SERVER_NAME']
. $_SERVER['REQUEST_URI'];
}
function gnr_remove_amp_uri_part($uri, $pattern) {
$s_end = strlen($uri);
$s_len = strlen($pattern);
$offset = $s_end - $s_len;
if ($offset < 0) {
return $uri;
}
$pos = strpos($uri, $pattern, $offset);
if ($pos === $offset) {
return substr($uri, 0, $pos);
}
return $uri;
}
function gnr_remove_amp_pattern($uri) {
$uri = gnr_remove_amp_uri_part($uri, '/amp');
$uri = gnr_remove_amp_uri_part($uri, '/amp/');
$uri = gnr_remove_amp_uri_part($uri, '?amp=1');
$uri = gnr_remove_amp_uri_part($uri, 'type=AMP');
return $uri;
}
function gnr_get_amp_pattern($uri) {
$ret = '/amp'; if (gnr_tail_pattern_matched($uri, $ret)) return $ret;
$ret = '/amp/'; if (gnr_tail_pattern_matched($uri, $ret)) return $ret;
$ret = '/?amp=1'; if (gnr_tail_pattern_matched($uri, $ret)) return $ret;
$ret = 'type=AMP'; if (gnr_tail_pattern_matched($uri, $ret)) return $ret;
}

function gnr_stop_lazyloading_when_amp() {
return !gnr_is_amp();
}
add_filter('wp_lazy_loading_enabled', 'gnr_stop_lazyloading_when_amp');
function gnr_delete_amp_lazyload($html_src) {
if(!gnr_is_amp()) {
return $html_src;
}
$html_src = preg_replace('#(loading|decoding|fetchpriority)[ \t]*=[ \t]*"[^"]*"#', '', $html_src);
return $html_src;
}
add_filter('post_thumbnail_html', 'gnr_delete_amp_lazyload', 9999);
add_filter('the_content', 'gnr_delete_amp_lazyload', 9999);