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

1 vote321 views2 answers
Yii1 set flash
PHP
3 votes364 views2 answers
Install phpmyadmin on mac
PHP
0 vote408 views1 answer
How to free session variable in php codeigniter
PHP CodeIgniter
0 vote317 views1 answer
Wp $_post
PHP
0 vote342 views1 answer
Php heredoc variable substitution
PHP
0 vote402 views2 answers
Create curl api request php with para
PHP
7 votes315 views1 answer
Ternary operator laravel blade
PHP
0 vote372 views1 answer
How to get webhook response in laravel
PHP Laravel
1 vote331 views1 answer
Use model from variable laravel
PHP
4 votes351 views5 answers
Add csrf token laravel
PHP