<?php
$data = array(
"28000000000000003" => 'ABC',
"28000000000000001" => 'PQR'
);
echo "<pre>" ;
echo "1.".in_array("28000000000000003",array_keys($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;
?>
preferences:
40.24 ms | 402 KiB | 5 Q