GeeksForGeekshttps://www.geeksforgeeks.org › php › how-to-avoidHow to avoid undefined offset error in PHP There are some methods to avoid undefined offset error that are discussed below: isset () function: This function checks whether the variable is set and is not equal to 更多内容请查看https://www.geeksforgeeks.org/php/how-to-avoid-undefined-offset-error-in-php/