Why are there errors in encoding when transferring a site from hosting to hosting?

Question

PHP

Hello! when migrating a site to wordpress from the best hosting with characteristics:
php 7.0
Database client version: libmysql - 5.1.73
phpMyAdmin 4.0.10.14

to another, more outdated, with characteristics:
php 5.4.6
MySQL client version: 5.0.22
PHP extension is used : mysqli
MySQL-encoding: UTF-8 Unicode (utf8)
phpMyAdmin - 2.11.11.3 Exported by database

as usual import with replacement of
"utf8mb4" to "utf8" for compatibility and utf8mb4_unicode_ci to utf8_unicode_ci in notepad++ , so export with maximum compatibility with mysql40 version - always errors with encoding, tk.
when entering the wp_options database tablealready see inscriptions of lines of this kind
blogname ????? "?????? ??????"
blog description ????????????? ????? ? 20 ?? ?? ??????

and on the site itself - a (modified) theme is displayed for some reason with standard settings and inscriptions in Latin and Cyrillic in the form (???). I can’t get into the admin panel - when I enter the page I get an error:

Warning: Cannot modify header information - headers already sent by (output started at D:\...\httpdocs\wp-includes\functions.php:3740) in D:\...\httpdocs\wp-includes\pluggable. php on line 1224

And, if I turn on debug, then additional ones:

Notice: load_plugin_textdomain was called with an argument that is deprecated since version 2.7 with no alternative available. in D:\...\httpdocs\wp-includes\functions.php on line 3740

Warning: Unexpected character in input: '\' (ASCII=92) state=1 in D:\...\httpdocs\wp- content\plugins\shortpixel-image-optimiser\wp-shortpixel.php on line 3177

Warning: Unexpected character in input: '\' (ASCII=92) state=1 in D:\...\httpdocs\wp-content\ plugins\shortpixel-image-optimiser\wp-shortpixel.php on line 3179

Warning: Unexpected character in input: '\' (ASCII=92) state=1 in D:\...\httpdocs\wp-content\plugins\ shortpixel-image-optimiser\wp-shortpixel.php on line 3181

and on the main page in this case - a white page with an error:

Sorry, but recursing filters on "the_content" breaks NextGEN Gallery. Please see https://core.trac.wordpress.org/ticket/17817 and NGG_DISABLE_FILTER_THE_CONTENT

Answer 1

the answer, as it turned out, is simple to the primitive - it was only necessary to replace the line in the config.php file : you don’t need
to
spend extra money on moving

Answer 2

Move to a normal hosting with mysql 5.5 and fresh php, this php of yours was no longer supported a couple of years ago already to move to it