<?php $data = array( "28000000000000003" => 'ABC', "28000000000000001" => 'PQR' ); echo "1.".in_array("28000000000000003",array_keys($data),true) , PHP_EOL; echo "2.".in_array("28000000000000003",array_keys($data)) , PHP_EOL; echo "3.".in_array("28000000000000003",array("28000000000000003","28000000000000001"),true) , PHP_EOL; echo "4.".in_array("28000000000000003",array("28000000000000003","28000000000000001")) , PHP_EOL; ?>
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