Preview:
<?php
$isUserLogin = true;
if ($isUserLogin) {
echo
"<div style: 'width:500px;height:80px;background-color: yellow;color:#fff;margin:10px auto;text-align:center; line-height:80px;'>
  خوش امدید
</div>";
}else{
echo
"<div style: 'width:500px;height:80px;background-color: yellow;color:#fff;margin:10px auto;text-align:center; line-height:80px;'>
  ثبت نام کمید
</div>";
}
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