Does array element contain substring? [duplicate]

Question

I'd like a function that checks whether an array's items contain a string. As such:

array(1 => 'Super-user', 'Root', 'Admin', 'Administrator', 'System', 'Website', 'Owner', 'Manager', 'Founder');

And then checking for admin12 should return true as a part of admin12 (admin) is also a part of the array.

I came this far:

$forbiddennames= array(1 => 'Super-user', 'Root', 'Admin', 'Administrator', 'System', 'Website', 'Owner', 'Manager', 'Founder');    

if(in_array( strtolower($stringtocheck), array_map('strtolower', $forbiddennames))){
        echo '"This is a forbidden username."';
    } else {
        echo 'true';
    }
}

Only this only echos "This is a forbidden username." when I check for admin. I want it also to echo when checking for admin12.

Is this possible (and how)?

Answer 1

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!

Answer 2

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

Answer 3

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';
}

Answer 4

you want PHPs 'strpos' function. loop through each array element, and then check each element against 'strpos' PHP strpos reference

foreach($forbiddennames as $fn){
 if(strpos($stringtocheck,$fn)){
  //found it!
 }else{
  //not found!
 }
}