Warning: File_Get_Contents in php 8.1 wordpress - php

Question

I recently changed the php version from 7.4 to 8.1
But after the change, I get an error when posting content in WordPress
You need to know that despite this error, the article will be sent, but this error has bothered me
I activated the WordPress debugger, the error was referring to the active plugin in WordPress
This line:
$pictureFile = file_get_contents($imageFilePath);
WP_DEBUG :
Fatal error: Uncaught ValueError: Path cannot be empty in /home/admin/domains/xxx.org/public_html/wp-content/plugins/mp3publisher7/mp3-post-publisher.php:113
Stack trace:
#0 /home/admin/domains/xxx.org/public_html/wp-content/plugins/mp3publisher7/mp3-post-publisher.php(113): file_get_contents()
#1 /home/admin/domains/xxx.org/public_html/wp-includes/class-wp-hook.php(310): save_mp3_post_publisher()
#2 /home/admin/domains/xxx.org/public_html/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters()
#3 /home/admin/domains/xxx.org/public_html/wp-includes/plugin.php(517): WP_Hook->do_action()
#4 /home/admin/domains/xxx.org/public_html/wp-includes/post.php(4717): do_action()
#5 /home/admin/domains/xxx.org/public_html/wp-includes/revision.php(337): wp_insert_post()
#6 /home/admin/domains/xxx.org/public_html/wp-includes/revision.php(191): _wp_put_post_revision()
#7 /home/admin/domains/xxx.org/public_html/wp-includes/class-wp-hook.php(310): wp_save_post_revision()
#8 /home/admin/domains/xxx.org/public_html/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters()
#9 /home/admin/domains/xxx.org/public_html/wp-includes/plugin.php(517): WP_Hook->do_action()
#10 /home/admin/domains/xxx.org/public_html/wp-includes/post.php(4686): do_action()
#11 /home/admin/domains/xxx.org/public_html/wp-includes/post.php(4819): wp_insert_post()
#12 /home/admin/domains/xxx.org/public_html/wp-admin/includes/post.php(426): wp_update_post()
#13 /home/admin/domains/xxx.org/public_htm/wp-admin/post.php(227): edit_post()
#14 {main} thrown in /home/admin/domains/xxx.org/public_html/wp-content/plugins/mp3publisher7/mp3-post-publisher.php on line 113
More complete code of this plugin :
$mp3FilePath = get_attached_file($_POST["mp3_file_id"]);
$thumb_id = get_post_thumbnail_id($postId);
$imageFilePath = get_attached_file($thumb_id);
$pictureFile = file_get_contents($imageFilePath);
$info = array(
"artist"=>$_POST["mp3_artist"],
"album"=>$_POST["mp3_album"],
"comment"=>$_POST["mp3_comment"],
"title"=>$_POST["mp3_caption"],
"cover_data" => array(
array (
'data'=> $pictureFile,
'picturetypeid'=> 3,
'mime'=> 'image/jpeg',
'description' => 'My Picture'
)
)
When I disable this plugin, there is no problem in posting
After deleting the following line, the problem will be solved, but some parts of the plugin will not work anymore:
// $pictureFile = file_get_contents($imageFilePath);
If anyone can please help. I can't think of anything anymore
tnx..........................

Answer 1

The error is not occurring with file_get_contents(), but your variable $imageFilePath is returning a null value.
Try console log echo("<script>console.log('The value of imageFilePath is : " . $imageFilePath . "');</script>");