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<?php
function functionName()
{
    // Code to be executed
}
?>

<?php
function writeName()
{
    echo "Kai Jim Refsnes";
}

echo "My name is ";
writeName();
?>

My name is Kai Jim Refsnes

<?php
function writeName($fname)
{
    echo $fname . " Refsnes.<br>";
}

echo "My name is ";
writeName("Kai Jim");
echo "My sister's name is ";
writeName("Hege");
echo "My brother's name is ";
writeName("Stale");
?>

My name is Kai Jim Refsnes.
My sister's name is Hege Refsnes.
My brother's name is Stale Refsnes.

<?php
function writeName($fname, $punctuation)
{
    echo $fname . " Refsnes" . $punctuation . "<br>";
}

echo "My name is ";
writeName("Kai Jim", ".");
echo "My sister's name is ";
writeName("Hege", "!");
echo "My brother's name is ";
writeName("Ståle", "?");
?>

My name is Kai Jim Refsnes.
My sister's name is Hege Refsnes!
My brother's name is Ståle Refsnes?

<?php
function add($x, $y)
{
    $total = $x + $y;
    return $total;
}

echo "1 + 16 = " . add(1, 16);
?>

1 + 16 = 17