check value in an array

this example will check if a value exists in an array using the in_array function

<html>
<body>
<?php
$grades = array(45,80,23,100,3);

if(in_array("80",$grades))
{
echo "value exists in array";
}
else
{
echo "value does not exist in array";
}

if(in_array("75",$grades))
{
echo "value exists in array";
}
else
{
echo "value does not exist in array";
}

?>
</body>
</html>

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