Deneyebilir misiniz?
<div class="project-slider owl-carousel owl-theme">
<?php
$psor = $db->prepare("SELECT * FROM projeler WHERE anasayfa=? AND dil=? ORDER BY id ASC");
$psor->execute(array("1", $_SESSION['dil']));
$pisl = $psor->fetchALL(PDO::FETCH_ASSOC);
$array_new1 = array();
foreach ($pisl as $pson){
array_push($array_new1,$pson);
}
array_multisort(array_column($array_new1, 'id'), SORT_ASC, $array_new1);
?>
<?php
foreach ($array_new1 as $pson) {
?>
<div class="single-project">
<?php
$rsor = $db->prepare("SELECT * FROM projeresim WHERE rid=? ORDER BY id ASC");
$rsor->execute(array($pson['id']));
$risl = $rsor->fetchALL(PDO::FETCH_ASSOC);
$ilkResim = true;
$array_new2 = array();
foreach ($risl as $rson){
array_push($array_new2,$rson);
}
array_multisort(array_column($array_new2, 'id'), SORT_ASC, $array_new2);
foreach ($array_new2 as $rson){
$resimURL = "/".tema."/uploads/projeler/diger/".$rson['resim'];
if ($ilkResim){
?>
<a title="" class="popup-btn" href="<?=$resimURL;?>"><img src="<?=$resimURL;?>" alt="" class="project-img"></a>
<?
$ilkResim = false;
} else {
?>
<a class="popup-btn" href="<?=$resimURL;?>" style="display: none;"></a>
<?
}
}
?>
<div class="fancybox"><i class="bx bx-expand" aria-hidden="true"></i></div>
</div>
<?php
}
?>
</div>