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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