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Throughout the past day I have been researching on google ‘<i>How to check if username already exists in database using PDO</i>’

All I have found that seems helpful is this line of code but am not entirely sure how to use it and where to put it. Like I said I am completely new to working this function. I am getting the following line of code from a stackexchange question that can be found here.

if( $row = $sthandler->fetch() ){
    // User exists: read its details here
    // User does not exist

Perhaps you may be able to help me further by directing me more into the right direction.

Best regards,