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<?php $a = array(0 => 5); $b = array(4294967296 => 5); var_dump($a === $b);
Output for 5.5.27 - 5.5.35, 5.6.11 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.6 - 7.2.33, 7.3.16 - 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
bool(false)
Output for 5.5.24 - 5.5.26, 5.6.8 - 5.6.10
bool(true)

preferences:
145.67 ms | 401 KiB | 177 Q