Are php variables case sensitive?

Are php variables case sensitive?

PHP variable rules:

Variables start with a $ symbol, followed by the name of the variable

Variable names must start with letters or underscores Beginning

Variable names cannot begin with a number

Variable names may only contain alphanumeric characters and underscores (A-z, 0-9, and _)

Variable names are case-sensitive ($y and $Y are two different variables)

Note:

PHP variable names are case-sensitive!

Code example:

<?php
 
$a = &#39;a&#39;;
$A = &#39;A&#39;;
echo $a;
echo $A;
 
?>

Output:

aA

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