This repository demonstrates a subtle bug in PHP related to the isset() function, numeric array keys, and values that evaluate to false (such as 0 and false). The isset() function doesn't reliably ...

This repository demonstrates a subtle issue with PHP's isset() function. The isset() function is often used to check if a variable is set and is not NULL. However, its behavior can be surprising when ...

PHP has different types of built-in functions which can be used to check the value of a variable. Basically there are three useful functions you can use for test the value of a variable i.e. isset(), ...

All the variables including , 0,false and NULL are empty. In the offical document, we are able to find out empty() run the concise above. empty() using isset() to determine whether the value is empty.