What are the considerations for variable declaration in PHP when dealing with different data types and value ranges, especially in the context of signed integers?

When declaring variables in PHP, it is important to consider the data type and value range, especially when dealing with signed integers. PHP supports different data types such as int, float, and string, among others. To ensure that variables can hold values within the appropriate range for signed integers, it is recommended to use the int data type for whole numbers and ensure that the values fall within the range of -2,147,483,648 to 2,147,483,647.

// Declare a variable with the int data type to hold signed integers within the appropriate range
$signedInt = 12345;
echo $signedInt;