<?php
    $foo = 1;
    $bar = "Testing";
    $xyz = 3.14;
    $foo = $foo + 1;
?>

<?php
    $foo[1] = 1;  
    $foo[2] = 2;
    $bar[1][2] = 3;
?>

<?php
    phpinfo();
    foo();
    $len = strlen($foo);
?>

<?php
    while($foo) {
        ...
    }
?>

<?php
    echo $foo;
    printf(".2f",$price);
?>