PHP, MYSQL workbench, postman not working correctly - php

Question

I have 2 users in a table, for example Vesna and Silvija, Vesna is first, Silvija second and if I type Silvija in postman he will return me "User does not exist and than Id of a user Silvija. This should be working on a way that Postman return just an Id of a User and if I type user that doesnt exist he should return that user doesnt exist. But when I type a users that doesnt actually exist he will return 2 times that users doesnt exist instead one time because table have 2 users that doesnt match entered user. Hope I have explained it understandably and that someone can help me.
foreach($oUsers as $oUser)
{
if($oUser->USERNAME == $sUsername)
{
$_SESSION['user_id'] = $oUser->USER_ID;
$_SESSION['username'] = $oUser->USERNAME;
echo $_SESSION['user_id'];
break;
}
else
{
echo ' User does not exist';
}
}

Answer 1

You can not use echo '...' inside the foreach loop because echo is executed in every iteration.
$found = false;
foreach($oUsers as $oUser){
if($oUser->USERNAME == $sUsername){
$_SESSION['user_id'] = $oUser->USER_ID;
$_SESSION['username'] = $oUser->USERNAME;
$found = true;
break;
}
}
if($found === true){
echo $_SESSION['user_id'];
}else{
echo ' User does not exist';
}