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PHP Case Sensitivity

In PHP, all keywords (e.g. if, else, while, echo, etc.), classes, functions, and user-defined functions are NOT case-sensitive. However all variable names are case-sensitive.

Example 1: Echo Keyword can be written in following ways:

<?php
   echo "echo keyword in lower letter <br>";
   Echo "Echo keyword in sentance case <br>";
   EcHo "EcHo keyword in mixed case <br>";
   ECHO "ECHO keyword in capital case <br>";
?> 
Output:
echo keyword in lower letter
Echo keyword in sentance case
EcHo keyword in mixed case
ECHO keyword in capital

Example 2: PHP variable declaration and use.

<?php
   $name="Rasmus Lerdorf";
   $dob="22 November 1968";
   $YEAR="1995";
   echo "PHP Developed By $name in $year <br>";
   echo "DOB of $NAME is $dob";
?> 
Output:
PHP Developed By Rasmus Lerdorf in 
DOB of is 22 November 1968