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<?php $data = array("28000000000000003" => 'ABC',"28000000000000001" => 'PQR'); var_dump(in_array("28000000000000003", array_keys($data), true),array_keys($data)); var_dump(in_array("28000000000000003", array_keys($data)), array_keys($data)); var_dump(in_array("28000000000000003", array("28000000000000003","28000000000000001"), true)); var_dump(in_array("28000000000000003", array("28000000000000003","28000000000000001"))); ?>
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.12 - 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) array(2) { [0]=> int(28000000000000003) [1]=> int(28000000000000001) } bool(true) array(2) { [0]=> int(28000000000000003) [1]=> int(28000000000000001) } bool(true) bool(true)

preferences:
207.66 ms | 406 KiB | 309 Q