<?php

class Details {
    public $value;
    public function __construct($value) {
        $this->value = $value;
    }
}

$details = [new Details(1), new Details(2), new Details(3)];

$bool = false;
$obj;
foreach ($details as $detail) {
    // random if condition
    if ($detail->value == 1) {
        $obj = $detail;
        $bool = true;
    }
}

if (!$bool) {
    $obj = new Detail(1);
}