<?php
    $html = $eyou['field']['content_5'];
    //提取详情图片
    $pattern = '/<img[^>]+>/i';
    //使用preg_match_all函数来查找所有匹配的img标签
    preg_match_all($pattern, $html, $matches);
    // 输出结果
    //var_dump($matches[0]);
    $k = $pa - 1;
    echo $matches[0][$k];
?>