PHP is_array Function Guide

The is_array function is a built-in function in PHP that is used to check if a specified variable belongs to the array data type. When a variable is passed as a parameter, is_array will return a boolean value of true or false, indicating whether the variable is an array. If the variable is an array, it will return true; if the variable is not an array (such as an integer, string, etc.), it will return false.

This function is very useful for validating variable types when writing PHP code. By using the is_array function, you can ensure that the data you are working with is an array, thus avoiding unexpected errors in subsequent code. For example, when handling data submitted from a form, you may want to first check if a variable is an array before performing the necessary operations to ensure the robustness of the code.