CODEWITHSUNDEEP
php
Jon
Jon

Reputation: 117

Comparing user input with PHP array

For a small project I'm working on I want a user to be able to register an account using a username however I don't want to configure a database i.e I just want to compare the username the user inputs with a PHP array. 

<?php
$a=array("user1","user2");
for($a =0; $x<$arrlength; $a++){
if($username == $a){ //i want to say if $username is in array alert this and do nothing
$echo print a new username, already taken;
return false;
else(
array_push($a,username);?>

I'm working with the w3 schools PHP examples and I have something like this (the user inputs a 'username' in a form. I was wondering how you would actually implement this functionality properly.

Upvotes: 2

Views: 490

Answers (5)

Pedro Lobito
Pedro Lobito

Reputation: 98991

Late answer, but because I'm on a ternary mood, here it goes:

echo (in_array("someuser", array("user1","user2"))) ? "Got Username" : "Username not found";

Upvotes: 1

frankfullstack
frankfullstack

Reputation: 560

Try the solution of the other users but you could combine with Traits.

You could create a Trait called VerifyUser with the next content:

trait VerifyUser {
    public function verifyUser($user){
        if (in_array($username, $usersArray)){
            echo $username . "is already taken";
        }else {
            array_push($usersArray, $username);
        }
    }
}

Don't forget add your custom array to your class if you are working in a OOP environment. Add this trait with the use VerifyUser instruction.

class UsersCollection{
    use VerifyUsers

    $usersArray= ["user1", "user2"];

    $this->verifyUser("user1"); //It echo the custom message you could return a boolean value and then specify a custom behaviour.
}

Upvotes: 0

M_T
M_T

Reputation: 397

If you want to save the registered accounts across requests, you have to store them in a file or database (or something else..), because the script is run from start on every requests.

Instead of looping over the array, you could also use the in_array function. ( http://php.net/manual/de/function.in-array.php )

To store the usernames, take a look at the file functions. (e.g. http://php.net/manual/en/function.file-put-contents.php to write to a file, and file_get_contents or file(..) to read a file). (For real projects, make sure to lock the file to prevent race conditions.)

Upvotes: 2

Geoherna
Geoherna

Reputation: 3574

You could simply use the in_array() function:

<?php
$usernames = array("user1", "user2", "user3", "user4");

if (in_array("username_from_user_input", $usernames)) {
    echo "Got Username";
}else{
    echo "Username not found"
}

?>

Upvotes: 4

Fred Willmore
Fred Willmore

Reputation: 4604

You can use in_array:

if (in_array($username, $a){
  ...
}

Upvotes: 0

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