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<html>
<head>
<title>array_key_exist</title>
</head>
<body>
<?php
$state["Delaware"] = "December 7, 1787";
$state["Pennsylvania"] = "December 12, 1787";
$state["Ohio"] = "March 1, 1803";
if (array_key_exists("Ohio", $state)) echo "Ohio joined
the Union on $state[Ohio]";
?>
</body>
</html>
Output:

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