php 正则提取文章中的图片，并替换、移动图片目录

<?php
//转移临时文件夹中的图片
$imgssss = preg_match_all("/linshi/[^\s\'\"]+.jpg|png|gif|jpeg{1}/ui", $content, $imgss);
$i = 1;
foreach ($imgss as $aimg) {
    if (is_string($aimg)) {
        if (file_exists($aimg)) {
            $newdir = "upload/" . date("ymdhis") . "/";
            if (!file_exists($newdir)) {
                mkdir($newdir, 0755, true);
            }
            $newname = $newdir . date("ymdhis") . $i . "." . pathinfo($aimg, PATHINFO_EXTENSION);
            rename($aimg, $newname);
            $content = str_replace($aimg, $newname, $content);
        }
        $i++;
    } elseif (is_array($aimg)) {
        foreach ($aimg as $imga) {
            if (file_exists($imga)) {
                $newdir = "upload/" . date("ymdhis") . "/";
                if (!file_exists($newdir)) {
                    mkdir($newdir, 0755, true);
                }
                $newname = $newdir . date("ymdhis") . $i . "." . pathinfo($imga, PATHINFO_EXTENSION);
                rename($imga, $newname);
                $content = str_replace($imga, $newname, $content);
            }
            $i++;
        }
    }
}
?>

<?php
$newdir = "upload/" . date("ymdhis") . "/";
if (!file_exists($newdir)) {
    mkdir($newdir, 0755, true);
}
$newname = $newdir . "s_" . date("ymdhis") . "." . pathinfo($upimgurl, PATHINFO_EXTENSION);
rename($upimgurl, $newname);
?>