Recently researching a project requires uploading user avatars on the WordPress front-end, and I checked some information on the Internet! solved this problem!
1: The first thing is to add the file upload box where needed
<form action="" method="post" enctype="multipart/form-data"> <input type="file" id="file" name="files[]" multiple="multiple" accept="image/*" /> <input type="submit" name="submit" value="Upload!" /> </form>
2: Process the image
$post=get_post(13);//测试用
if ( $_FILES ) {
$files = $_FILES['files'];
$count= count($files['name']);
foreach ($files['name'] as $key => $value) {
if ($files['name'][$key]) {
$file = array(
'name' => $files['name'][$key],
'type' => $files['type'][$key],
'tmp_name' => $files['tmp_name'][$key],
'error' => $files['error'][$key],
'size' => $files['size'][$key]
);
$_FILES = array("files" => $file);
foreach ($_FILES as $file => $array) {
$newupload = insert_attachment($file,$post->ID);//此方法将文章附加到ID为13的文章中。如果不想插入到文章可以为空""
} } } }
3: Add the function function to the functions.php file
insert_attachment该函数的第二个参数如果为空将不附加到文章中图片。
function insert_attachment($file_handler,$post_id,$setthumb='false') {
global $wpdb;
// check to make sure its a successful upload
if ($_FILES[$file_handler]['error'] !== UPLOAD_ERR_OK) __return_false();
require_once(ABSPATH . "wp-admin" . '/includes/image.php');
require_once(ABSPATH . "wp-admin" . '/includes/file.php');
require_once(ABSPATH . "wp-admin" . '/includes/media.php');
$attach_id = media_handle_upload( $file_handler, $post_id );
$image_url = wp_get_attachment_image_src( $attach_id,'full' );
if ($setthumb){
$wpdb->insert(
$wpdb->prefix . 'postmeta', array(
'post_id' => $post_id,
'meta_key' => 'wpcf-vi-img',
'meta_value' => $image_url[0] ));
}
return $attach_id;
} 4: Reference method
$image_url = wp_get_attachment_image_src( $attach_id,'full' );//由于页面刷新的问题直接在页面使用这个方法是不生效的！需要在函数中构造此方法的功能。
//循环文章中的特征图片的方法，如果将图片附加到文章中使用这个方法可以批量输出！
$imagess=get_post_meta(13,'wpcf-vi-img',false);
foreach($imagess as $images){
echo $images;
}