PHP Case Sensitivity

Basically names of user-defined functions, classes, built-in constructs and keywords such as echo, while, class, etc., are case-insensitive. However; variables on the other hand, are case-sensitive.

PHP Case Sensitivity Example 1

In the example below, all three echo statements below are legal (and equal):

<html><head><title>PHP Comments</title></head><body>hello, world!hello, world!hello, world!</body></html>

PHP Case Sensitivity Example 2

However; variables on the other hand, are case-sensitive. That is, $variable, $VARIABLE, $VariaBle and $VAriable are four different variables.

<html><head><title>PHP Comments</title></head><body><?php
$variable = "pen";
ECHO "This is my ". $variable;
ECHO "This is my ". $VARIABLE;
$VARIABLE = "shirt";
ECHO "This is my ". $VARIABLE;
ECHO "This is my ". $VariaBle;
$VariaBle = "car";
ECHO "This is my ". $VariaBle;
?></body></html>

This will produce following result

This is my pen
This is my
This is my shirt
This is my
This is my car

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PHP Case Sensitivity Example 1

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