PHP - Moved: Replace/remove If Starts With

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I'm working on a register script which has an array of strings that a username can not start with, but the script I'm using checks to see if the items in the array are anywhere in the username.

Here's my code.

$blockedWordsInUsername = array('mod', 'm0d', 'admin', 'adm1n', '4dm1n');
foreach($blockedWordsInUsername as $username) {
if(strstr($_POST['username'], $username) == true && !$error) {
$error = '<p style="text-align: center;">Sorry, that username is no longer available.</p>';
}
}

What I'm trying to do is make it so your name can't start with the items in the array.