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

0 vote136 views1 answer
Wordpress wp_enqueue_script footer
PHP Wordpress
0 vote120 views1 answer
Increase php_values
PHP
0 vote145 views1 answer
Trying to get property 'id' of non object in laravel api
PHP Laravel
-1 vote117 views1 answer
Php current datettime us time zone
PHP
0 vote117 views1 answer
Your Composer dependencies require a PHP version "><h1>HELLO THERE!</h1>
PHP
6 votes126 views2 answers
How many products can a laravel ecommerce handle
PHP Laravel
51 votes308 views3 answers
Laravel version check
PHP Laravel
0 vote134 views1 answer
Array session
PHP
1 vote131 views2 answers
Javascript php loop
PHP
6 votes139 views4 answers
Enset laravel session
PHP