Question 41516 in PHP Question posted in
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How to check in PHP8 if a unknown variable (e.g. e-mail) is in a string?

I usually checked this with the following code:

$email = '/[^@:="'s]*@[^@s]*.[a-z]+/iU';
if(preg_match($email,$article->text) == true) {
to something
}

In PHP 8 this is deprecated (Works, but with warning), because I can’t always guarantee that there really is an email in it.

Passing null to parameter #2 ($subject) of type string is deprecated

What are the alternatives?

I know that this solution still works, but I want to be fit for the future.

When searching, I did not find a solution. "str_contains" seems to allow only one string.

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2

Answers


  1. Chosen as BEST ANSWER
    0

    It is actually not caused by PHP, but by the Joomla CMS. There are situations where $article->text has not been defined. Thanks to all who have steered mine in the right direction through their thoughts.

    $email = '/[^@:="'s]*@[^@s]*.[a-z]+/iU';
if($article->text AND preg_match($email,$article->text) == true) {
  to something
}

  2. 0

    Passing null to parameter #2 ($subject) of type string is deprecated

    First of all, this warning only appears if you enable strict typing (which is a good thing, don’t get me wrong):

    declare(strict_types=1);

    It makes more sense to avoid the check altogether:

    if ($article->text !== null && preg_match($email, $article->text)) {
}

    But, if that isn’t feasible for whatever the reason, you can also default to empty string:

    if (preg_match($email, $article->text ?? '')) {
}

    On a side note, PHP has native email validation.

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