In php why `declare(strict

In PHP, the declaration “declare(strict_types=1);” is used to enforce strict typing in a file or within a specific scope. When strict types are enabled, PHP performs stricter type checking during function calls, ensuring that the argument types match the parameter types exactly.

Here are a few key points to understand about “declare(strict_types=1);“:

Type coercion: By default, PHP performs automatic type coercion, which means it tries to convert values between different types when necessary. For example, if a function expects an integer but receives a string, PHP will attempt to convert the string to an integer. However, with strict types enabled, no automatic type conversion is performed, and any type mismatches will result in a TypeError.
Type declarations: When strict types are enabled, function parameter types and return types must be explicitly declared. PHP supports scalar types (such as int, float, string, and bool) as well as compound types (array, object, and callable). Without strict types, type declarations are optional and may be omitted.
Benefits: Enabling strict types can help prevent type-related bugs and improve the reliability of your code. It ensures that you’re using the correct types consistently, which can catch errors at an earlier stage and make your code more predictable and easier to maintain.

To enable strict types, you need to add the “declare(strict_types=1);” declaration at the beginning of the PHP file or within the specific scope where you want strict typing to apply. This declaration must come before any other code or statements in the file.

Here’s an example to illustrate the usage of strict types:

<?php
declare(strict_types=1);

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

$result = addNumbers(5, '10'); // Results in a TypeError
?>

In the example above, the “addNumbers” function expects two integers as arguments and returns an integer. If strict types are enabled, calling the function with a string argument will result in a TypeError because the types do not match.

Overall, the “declare(strict_types=1);” declaration is a way to enforce stricter type checking in PHP, helping to catch type-related errors and improve code reliability.

In php why `declare(strict_types=1)` use?