Does array contain (part of) string?

This question already has an answer here:

How do I check if a string contains a specific word? 37 answers

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Loop through the $forbiddennames array and use stripos to check if the given input string matches any of the items in the array:

function is_forbidden($forbiddennames, $stringtocheck) 
{
    foreach ($forbiddennames as $name) {
        if (stripos($stringtocheck, $name) !== FALSE) {
            return true;
        }
    }
}

And use it like below:

if(is_forbidden($forbiddennames, $stringtocheck)) {
    echo "This is a forbidden username.";
} else {
    echo "True";
}

Demo!

---

foreach ($forbiddennames as $forbiddenname) {
    $nametocheck = strtolower($stringtocheck);
    if(strpos($stringtocheck, $forbiddenname) !== false) {
        echo "This is a forbidden username.";
        break;
    }
}

---

It doesn't really matter if you use array_map, foreach or something different. Possible solution:

$forbiddenNames = array('admin', 'bannedName');
$input = 'Admin12';
$allowed = true;
foreach($forbiddenNames as $forbiddenName) {
    if(stripos($input, $forbiddenName) !== false) {
        echo $input, ' is invalid';
        $allowed = false;
        break;
    }
}
if($allowed === true) {
    echo $input, ' is valid';
}

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