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How to avoid the Undefined Offset 1 error when executing the explode() function in PHP

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Definition

In this tutorial, I will show you how to prevent the Undefined Offset 1 error when using the explode() function in PHP. This error occurs due to the undefined array range while reading it. And, the Undefined Offset 1 error can be solved easily by merely adding the selected delimiter at the end of the string in the explode() function.

Syntax(1):

explode ( string $delimiter , string $string [, int $limit = PHP_INT_MAX ] ) : array

Returns an array of strings, each of which is a substring of string formed by splitting it on boundaries formed by the string delimiter.

- delimiter (The boundary string.)

- string (The input string.)

- limit

If limit is set and positive, the returned array will contain a maximum of limit elements with the last element containing the rest of string. If the limit parameter is negative, all components except the last -limit are returned. If the limit parameter is zero, then this is treated as 1.

If delimiter is an empty string (""), explode() will return FALSE. If delimiter contains a value that is not contained in string and a negative limit is used, then an empty array will be returned, otherwise an array containing string will be returned.

Code

- Define a string with to split, consisting of substrings seperated by a delimiter (:).

- Get substrings using the explode() function.

- Add the delimiter (:) at the end of the string in the explode()function - "$string_to_split:".

- Print each substring.

- Define the error string including one substring without the delimiter.

- Print the second substring that of the error string.

- Add the delimiter (:) at the end of the string in the explode()function - "$error_string:".

- Note: In this way, when you are using the explode() function in a function and if it tries to split a string like the error string, the server will not throw the Undefined Offset 1 error.


-------------- PHP --------------

$string_to_split = "Hello:world:php:web:website:developer, :126885682/ ";

$substring = explode(":", "$string_to_split:");

forEach($substring as $line){
	echo "<p>".$line."</p>";
}

$error_string = "test error";

echo "<p>".explode(":", "$error_string:")[1]."</p>";

Result:

You can inspect a web application in which I utilized this method from here.

Hello

world

php

web

website

developer,

126885682/

References

(1) https://www.php.net/manual/en/function.explode.php