Hold either numbers or strings. There is no need to declare the variable, nor is there a type involved.

examples/intro/variables.php
<h1>Varriables</h1>
<?php
    $name   = "Table";
    $width  = 23;
    $length = 17;
    echo $name;
    echo "<br>";
    echo "Size: ";
    echo $width * $length;
?>