For php learners must know simple thing.[PHP]

Question

In PHP function names even class names are not case sensitive. Which might lead us to think that all identifiers in php are not case sensitive. Guess again. Variables ARE case sensitive.

See example in comment.

Answer 1

function add($a, $b)

{

return $a + $b;

}

$foo = add(1, 2);

$Foo = Add(3, 4);

echo "foo is $foo"; // outputs foo is 3

echo "Foo is $Foo"; // outputs Foo is 7

See add and Add are same.