Php check undefined offset

// $key = 10, if $array does not have $array[10] set, it will return false
// If $array[10] has any value, it will return true
if(array_key_exists($key, $array)){}

Php undefined offset

If preg_match did not find a match, $matches is an empty array. So you should check if preg_match found an match before accessing $matches[0], for example:

function get_match($regex,$content)
{
    if (preg_match($regex,$content,$matches)) {
        return $matches[0];
    } else {
        return null;
    }
}

Source: stackoverflow.com

Similar codes

5 votes180 views1 answer
Php 8.1 release date
PHP
2 votes170 views2 answers
Laravel migration remove unique constraint
PHP
2 votes170 views2 answers
How to create shortcode with php
PHP
0 vote235 views1 answer
Cake php 2.x Group
PHP CakePHP
-3 votes165 views2 answers
Unset session key
PHP
0 vote159 views1 answer
PHP-cs-fixer: Executable Path Windows
PHP
0 vote173 views1 answer
Media library laravel maximum allowed size
PHP
0 vote170 views1 answer
Laravel request img
PHP
0 vote171 views1 answer
Php get locale active
PHP
5 votes185 views2 answers
Laravel group by with where clause
PHP