[BUG]: Escaper fails to escape string "0"

[zacek]

In Phalcon\Html\Escaper::html(string input = null) the validation of the input string is not correct:

if !input {
    return "";
}

In PHP, the implicit conversion of string "0" to bool results to false. Therefore, string "0" is escaped to an empty string.
The correct validation should read

if input === null {
    return "";
}

How to reproduce:

php -r "var_export((new \Phalcon\Html\Escaper())->html('0'));"

Expected result is "0" and not an empty string.

Details

• Phalcon version: 5.0.2 (Build Date Sep 28 2022 09:09:44)
• PHP Version: 8.1.11
• Operating System: CentOS Stream release 8
• Installation type: via package manager
• Zephir version (if any): Version 0.16.3

[Jeckerson]

Fixed in #16204

[niden]

Thank you @zacek