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<?php $post = []; //without casting $post['a'] = '1'; $a = $post['a'] ?? 0; var_dump($a); $post['a'] = '1'; $a = $post['a'] ?? false; var_dump($a); //with casting $post['a'] = '1'; $a = (int)$post['a'] ?? 0; var_dump($a); $post['a'] = '1'; $a = (bool)$post['a'] ?? false; var_dump($a);
Output for 7.1.25 - 7.1.28, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
string(1) "1" string(1) "1" int(1) bool(true)

preferences:
102.05 ms | 1415 KiB | 4 Q