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PHP Programing language

Which type using Default Argument
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What happens if you have a function named display that takes two arguments like this:
function display ($greeting, $message)
{
echo $greeting;
echo $mssage;
}

For Example:

<html>
<head>
<title>Using Default Function arguments </title>
<body>
<h1>Using Default Function arguments </h1>
<?php
echo "About to call the Function <br>";
echo "Passing data to the Function <br>";
display ("The Default argument is:");

function display ($greeting , $message = "Hello there!")
{
echo $greeting;
echo $message;
}
?>
</body>
</html>

Output:

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