<?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"))); ?>
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