<?php
function minify($buffer) {
    $search = array(
        '/\>[^\S ]+/s', 
        '/[^\S ]+\</s',
        '/(\s)+/s'      
    );
    $replace = array(
        '>',
        '<',
        '\\1'
    );
    $buffer = preg_replace($search, $replace, $buffer);
    $buffer = str_replace('> <', '><', $buffer);
    $buffer = str_replace("\t", '', $buffer);
    $buffer = preg_replace('/<!--.*?-->/ms', '', $buffer);
    return $buffer;
}

$ch = curl_init();
curl_setopt_array($ch, [
        CURLOPT_URL => 'https://www.olx.ro/ajax/search/list/',
        CURLOPT_SSL_VERIFYPEER => false,
        CURLOPT_POST => 1,
        CURLOPT_POSTFIELDS => http_build_query(array('search' => array('category_id' => 101), 'page' => 1)),
        CURLOPT_RETURNTRANSFER => 1
    ]
);
 
$buffer = minify(curl_exec($ch));
curl_close($ch);

preg_match_all('#<img class="fleft" src="(.+?)" alt="(.+?)">#si', $buffer, $matches);

foreach ($matches[2] as $index => $img) {
    echo '<li>';
    echo '<figure>';
    echo '<img src="' . $matches[1][$index] . '" style="width:216px;height:152px;object-fit:cover;">';
    echo '<figcaption>' . $matches[2][$index] . '</figcaption>';
    echo '</figure>';
    echo '</li>';
}