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<?php $array = array('\';DROP TABLE db_table;'); $string = json_encode($array, JSON_UNESCAPED_UNICODE); echo "UPDATE db_table SET db_field='$string'";
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
UPDATE db_table SET db_field='["';DROP TABLE db_table;"]'

preferences:
181.51 ms | 403 KiB | 296 Q