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<?php $a = 0x40; var_dump($a); // 64 var_dump(base_convert($a, 16, 2)); // But 64hex == 1100100 or 296 b/c passing effectively 64 in base 16 to convert to base 2 var_dump(base_convert(40, 16, 2)); // 64 b/c 40 in base 16 == 64 decimal == 1000000 or 2 ** 6
Output for git.master, git.master_jit, rfc.property-hooks
int(64) string(7) "1100100" string(7) "1000000"

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