wordpress 获取文章内所有图片

在制作wordpress主题过程中，有遇见想要自动获取文章内所有图片的情况，一开始没有思路，后来，想起大前段的xiu主题貌似就拥有这样的功能，经过维维大神的扣扯后，现在大叔拿来分享哈，绝笔可用的嚎！

将代码插入functions.php

function hui_get_thumbnail( $single=true, $must=true ) {
global $post;
$html = '';
if ( has_post_thumbnail() ) {
$domsxe = simplexml_load_string(get_the_post_thumbnail());
$src = $domsxe->attributes()->src;
$src_array = wp_get_attachment_image_src(hui_get_attachment_id_from_src($src), 'thumbnail');
$html = sprintf('<li><img src="%s" /></li>', $src_array[0]);
} else {
$content = $post->post_content;
preg_match_all('/<img.*?(?: |\\t|\\r|\\n)?src=[\'"]?(.+?)[\'"]?(?:(?: |\\t|\\r|\\n)+.*?)?>/sim', $content, $strResult, PREG_PATTERN_ORDER);
$images = $strResult[1];
$counter = count($strResult[1]);
$i = 0;
foreach($images as $src){
$i++;
$src2 = wp_get_attachment_image_src(hui_get_attachment_id_from_src($src), 'thumbnail');
$src2 = $src2[0];
if( !$src2 && true ){
$src = $src;
}else{
$src = $src2;
}
$item = sprintf('<li><img src="%s" /></li>', $src);
if( $single){
return $item;
break;
}
$html .= $item;
if(
($counter >= 4 && $counter < 8 && $i >= 4) ||
($counter >= 8 && $i >= 8) ||
($counter > 0 && $counter < 4 && $i >= $counter)
){
break;
}
}
}
return $html;
}
function hui_get_attachment_id_from_src ($link) {
global $wpdb;
$link = preg_replace('/-\d+x\d+(?=\.(jpg|jpeg|png|gif)$)/i', '', $link);
return $wpdb->get_var("SELECT ID FROM {$wpdb->posts} WHERE guid='$link'");
}