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<?php var_dump(html_entity_decode("\u0026#33;")); var_dump(html_entity_decode("&#33;"));
Output for 5.0.0 - 7.1.0
string(10) "\u0026#33;" string(1) "!"
Output for 4.3.0 - 4.4.9
string(10) "\u0026#33;" string(5) "&#33;"