Are php variable names case sensitive?

PHP is a popular programming language, especially widely used in the web direction. So is PHP's variable naming sensitive to size? The real answer is: PHP variable naming is case-sensitive.

PHP variable names are case-sensitive, but classes, functions, built-in structures, and keywords are not case-sensitive.

The following is a practical demonstration that PHP variable names are case-sensitive.

Create a new PHP document and declare a variable$stu='jack';

Name a header again Variables with capital letters (this way of writing variables is not recommended, here is to demonstrate the problem), example: $Stu = 'Smith';

##passed The above two definitions have resulted in two variables with different capitalization and the same name. Let’s print out the two variables. Example:

echo '小写的$stu的值为：'.$stu;
echo &#39;<br />&#39;;
echo &#39;大写的$Stu的值为：&#39;.$Stu;

Save the above Content, preview in the browser, if the values ​​of the two output variables are different, it means that variable names in PHP are case-sensitive, and the implementation proves that it is indeed case-sensitive

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