PHP Case Sensitivity

PHP Case Sensitivity

PHP Case Sensitivity

PHP is a case-sensitive language, which means that variables, function names, and other identifiers are distinguished by their capitalization. This means that “hello” and “Hello” are considered different variables in PHP.

For example, the following code will produce an error because the variable name is not capitalized consistently:

				
					<?php
$myVariable = "Hello, world!";
echo $myvariable; // produces an "Undefined variable" error
?>

				
			

To avoid errors like this, it’s important to be consistent with your capitalization when naming variables, functions, and other identifiers in your PHP code.

However, there are some exceptions to PHP’s case sensitivity rules. For example, function and method names are not case-sensitive in PHP versions before 8.0.0, which means that you can call a function using different capitalization without producing an error. For example:

				
					<?php
echo strlen("Hello, world!"); // produces "13"
echo StrLen("Hello, world!"); // also produces "13"
?>

				
			

In PHP 8.0.0 and later versions, function and method names are case-sensitive by default, but you can enable case-insensitive function and method names by setting the “zend.function_case” directive to “0” in the php.ini configuration file. However, this is not recommended because it can lead to confusion and errors in your code.

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