我在前端有一个表单，我想从前端创建帖子，一切正常，但当我上传特色图片时，会上传破碎的特色图片。我看到上传文件夹中有图像，但我不明白为什么上传时图像会断开，如果有任何帮助，将不胜感激。谢谢

这是我的密码。

<?php 
add_action( \'wp_ajax_bpem_event_form_response\', \'bpem_event_form_response\' );
add_action( \'wp_ajax_nopriv_bpem_event_form_response\', \'bpem_event_form_response\' );

function bpem_event_form_response() {

$title              = sanitize_text_field($_POST[\'ev_title\']); 
$content            = $_POST[\'ev_desc\'];
$image_url        = sanitize_text_field($_POST[\'ev_image\']);
$location         = sanitize_text_field($_POST[\'ev_location\']);
$start_date       = sanitize_text_field($_POST[\'ev_start_date\']);
$start_time       = sanitize_text_field($_POST[\'ev_start_time\']);
$end_date         = sanitize_text_field($_POST[\'ev_end_date\']);
$end_time         = sanitize_text_field($_POST[\'ev_end_time\']);
$ev_organizer     = sanitize_text_field($_POST[\'ev_organizer\']);
$ev_organizer_url = sanitize_text_field($_POST[\'ev_organizer_url\']);
$group              = sanitize_text_field($_POST[\'ev_group\']);


$post_id = wp_insert_post(array (
   \'post_type\'         => \'bpem_event\',
   \'post_title\'        => $title,
   \'post_content\'    => $content,
   \'post_status\'       => \'publish\'
));


add_post_meta( $post_id, \'evn_location\', $location );
add_post_meta( $post_id, \'evn_startDate\', $start_date);
add_post_meta( $post_id, \'evn_startTime\', $start_time);
add_post_meta( $post_id, \'evn_endDate\', $end_date);
add_post_meta( $post_id, \'evn_endTime\', $end_time);
add_post_meta( $post_id, \'evn_organizer\', $ev_organizer);
add_post_meta( $post_id, \'evn_organizer_url\', $ev_organizer_url);
add_post_meta( $post_id, \'evn_group\', $group);
add_post_meta( $post_id, \'evn_group_slug\', sanitize_title($group));



// Add Featured Image to Post

$imagebase        = basename( $image_url ); 
$image_name       = $imagebase;
$upload_dir       = wp_upload_dir(); // Set upload folder
$image_data       = file_get_contents($image_url); // Get image data
$unique_file_name = wp_unique_filename( $upload_dir[\'path\'], $image_name ); // Generate unique name
$filename         = basename( $unique_file_name ); // Create image file name

// Check folder permission and define file location
if( wp_mkdir_p( $upload_dir[\'path\'] ) ) {
    $file = $upload_dir[\'path\'] . \'/\' . $filename;
} else {
    $file = $upload_dir[\'basedir\'] . \'/\' . $filename;
}

// Create the image  file on the server
file_put_contents( $file, $image_data );

// Check image file type
$wp_filetype = wp_check_filetype( $filename, null );

// Set attachment data
$attachment = array(
    \'post_mime_type\' => $wp_filetype[\'type\'],
    \'post_title\'     => sanitize_file_name( $filename ),
    \'post_content\'   => \'\',
    \'post_status\'    => \'publish\'
);

// Create the attachment
$attach_id = wp_insert_attachment( $attachment, $file, $post_id );

// Include image.php
require_once(ABSPATH . \'wp-admin/includes/image.php\');

// Define attachment metadata
$attach_data = wp_generate_attachment_metadata( $attach_id, $file );

// Assign metadata to attachment
wp_update_attachment_metadata( $attach_id, $attach_data );

// And finally assign featured image to post
set_post_thumbnail( $post_id, $attach_id );

echo "Success";

    wp_die();
}