<?php
 $results = $mysqli->query("SELECT * FROM centros WHERE estado = 1");
   foreach ($results as $centros){
?>

 <div id="port" class="portfolio valencia center" data-cat="valencia">
    <?php if ($centros['logo']== null) {
       echo "<img src="images/centros/cut.svg" class="imgCentro1">";
       }else {
       echo "<img src="images/centros/$logo"  class="imgCentro1">";
       } ?>
 </div>

<?php } ?>

$( "#port" ).mouseenter(function() {
    $('.imgCentro1').css("transform"," rotate(-45deg)");
    $('.imgCentro1').css("transition","1s");
  });
  $( "#port" ).mouseleave(function() {
    $('.imgCentro1').css("transform"," rotate(0deg)");
    $('.imgCentro1').css("transition","1s");
  });