The difference between a variable and a string is that a variable for the value will house only 1 character (rather number or letter) and a string, the value is more then 1 character (rather number or letter). Are my examples below correct?

// this is a variable
$variable = '4';

// this is a string
$variable = '456344534';

// another string
$teacher = "Ms. Doughtfire";

// another variable
$school_code = '9';

Is this correct?

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Brand New to PHP Coding. Starting Learning 01/01/2007! This is my year to learn PHP.