<?php
$data = [
'type' => '5',
'title' => 'Piva za 25 Kč právě teď',
'message' => 'Jenom v Cool Ticketu koupíte právě teď piva za 25 Kč. Akce HAPPY HOURS trvá pouze do 11:00.',
'img' => 'https://cdn.cool-ticketing.com/images/generic/api/img-21704_w135_h135.png',
'categoryId' => '242',
];
var_dump(json_encode($data));
string(307) "{"type":"5","title":"Piva za 25 K\u010d pr\u00e1v\u011b te\u010f","message":"Jenom v Cool Ticketu koup\u00edte pr\u00e1v\u011b te\u010f piva za 25 K\u010d. Akce HAPPY HOURS trv\u00e1 pouze do 11:00.","img":"https:\/\/cdn.cool-ticketing.com\/images\/generic\/api\/img-21704_w135_h135.png","categoryId":"242"}"
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
string(307) "{"type":"5","title":"Piva za 25 K\u010d pr\u00e1v\u011b te\u010f","message":"Jenom v Cool Ticketu koup\u00edte pr\u00e1v\u011b te\u010f piva za 25 K\u010d. Akce HAPPY HOURS trv\u00e1 pouze do 11:00.","img":"https:\/\/cdn.cool-ticketing.com\/images\/generic\/api\/img-21704_w135_h135.png","categoryId":"242"}"