Php array prompt Notice: Undefinedoffset solution

When using arrays, we often encounter the error Notice: Undefinedoffset when the array does not exist, resulting in our Jane array [100]. next I will introduce how to solve this problem.

When using arrays, we often encounter the error Notice: Undefined offset when the array does not exist, resulting in our Jane array [100]. next I will introduce how to solve this problem, for example, the code is as follows:

1. $ Array [1] = 'www .phpfensi.com ';
2. Echo $ array [0];

The input result is: Notice: Undefined offset: 1 in D: wwwrootwraskseo404.php on line 5.

The code is as follows: echo isset ($ array [0])? $ Array [0]: 'Array undefined '; this will solve this problem well.