explode(): Passing null to parameter #2 ($string) of type string is deprecated

$_SERVER

Array
(
    [USER] => philipp
    [HOME] => /home/philipp
    [HTTP_COOKIE] => PHPSESSID=1u9sf70poorc709cjl1b2isiuh
    [HTTP_ACCEPT_ENCODING] => gzip, br, zstd, deflate
    [HTTP_USER_AGENT] => Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
    [HTTP_ACCEPT] => */*
    [HTTP_HOST] => shop.pa-metals.de
    [REDIRECT_STATUS] => 200
    [SERVER_NAME] => shop.pa-metals.de
    [SERVER_PORT] => 443
    [SERVER_ADDR] => 10.0.3.169
    [REMOTE_USER] => 
    [REMOTE_PORT] => 5770
    [REMOTE_ADDR] => 3.144.154.109
    [SERVER_SOFTWARE] => nginx/1.18.0
    [GATEWAY_INTERFACE] => CGI/1.1
    [HTTPS] => on
    [REQUEST_SCHEME] => https
    [SERVER_PROTOCOL] => HTTP/2.0
    [DOCUMENT_ROOT] => /var/vhosts/pa-metals.de/dev/public
    [DOCUMENT_URI] => /index.php
    [REQUEST_URI] => /list?type=rent
    [SCRIPT_NAME] => /index.php
    [CONTENT_LENGTH] => 
    [CONTENT_TYPE] => 
    [REQUEST_METHOD] => GET
    [QUERY_STRING] => type=rent
    [SCRIPT_FILENAME] => /var/vhosts/pa-metals.de/dev/public/index.php
    [FCGI_ROLE] => RESPONDER
    [PHP_SELF] => /index.php
    [REQUEST_TIME_FLOAT] => 1746592020.3425
    [REQUEST_TIME] => 1746592020
)

$_GET

Array
(
    [type] => rent
    [to] => 
)

SQL-Queries

• SELECT k.* FROM container_klog k LEFT JOIN container_category c ON k.category_id = c.id WHERE k.status = 0 AND k.show_shop = 1 AND k.deleted = 0 ORDER BY CAST(SUBSTRING_INDEX(c.name, "'", 1) AS UNSIGNED), c.name ASC 0.0020699501 seconds
• SELECT COUNT(*) as total_quantity FROM container_klog WHERE pid='14' AND status=0 AND deleted=0 0.0006921291 seconds
• SELECT * FROM container_category WHERE id='7' 0.0005819798 seconds
• SELECT * FROM contact WHERE id='5103' 0.0007250309 seconds
• SELECT COUNT(*) as total_quantity FROM container_klog WHERE pid='17' AND status=0 AND deleted=0 0.0006999969 seconds
• SELECT * FROM container_category WHERE id='3' 0.0006649494 seconds
• SELECT * FROM contact WHERE id='5103' 0.0007908344 seconds
• SELECT COUNT(*) as total_quantity FROM container_klog WHERE pid='22' AND status=0 AND deleted=0 0.0006790161 seconds
• SELECT * FROM container_category WHERE id='3' 0.0005850792 seconds
• SELECT * FROM contact WHERE id='5103' 0.0007109642 seconds
• SELECT COUNT(*) as total_quantity FROM container_klog WHERE pid='37' AND status=0 AND deleted=0 0.0007469654 seconds
• SELECT * FROM container_category WHERE id='3' 0.0007851124 seconds
• SELECT * FROM contact WHERE id='5103' 0.0007829666 seconds
• SELECT DISTINCT color FROM container_klog WHERE color != '' AND deleted = 0 0.0008399487 seconds