What are the limitations of declaring variable types in PHP compared to other programming languages like C++?

In PHP, the limitation of declaring variable types compared to languages like C++ is that PHP is a dynamically typed language, meaning that variables do not have explicit types and can change during runtime. This can lead to potential errors or unexpected behavior if the wrong type of data is assigned to a variable. To address this limitation, developers can use PHP 7's scalar type declarations to specify the expected type of a variable when declaring a function. 

function add(int $a, int $b): int {
    return $a + $b;
}

echo add(5, 10); // Output: 15

Keywords

variable types PHP C++ limitations programming languages

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