Variables

• Should generally contain only lowercase letters, though numbers are occasionally needed (i.e. for semester values)

Incorrect:

    $Route345 = 345;

Correct:

    $route = 345;

• Should be reasonably named to indicate their purpose and content, using a minimum of three characters

Incorrect:

    $a = ($n / $d) * 100;

Correct:

$avg = ($num / $dem) * 100;

• Single letter variables should only be used in for loops

i.e.

    for($i = 0; $i < $rsc; $i++) {...}