附加到PHP变量，但在'；之前；。jpg'；/'；。巴布亚新几内亚'；等

所以我创建了一个上传图像的基本代码。用户上传2个图像，当它们被处理/上传时，我有一点代码来确保它们上传到服务器时文件名不相同

if(file_exists($imgpath1)){
    $imgpath1 = $imgpath1 . $random;
}
if(file_exists($imgpath2)){
    $imgpath2 = $imgpath2 . $random;
}

让我们以“$imgpath1=”images/user/1.jpg”开始（在运行上述PHP之前）

$random是脚本开始时生成的随机数，比如说$random='255'

代码工作正常，图像仍能正确显示，但它将“255”（$random）直接添加到文件路径的末尾，因此在上述代码运行后，$imgpath1=“images/user/1.jpg255”

文件扩展名并不总是.jpg。显然，它可以是.png、.bmp等等

如何使$random（本例中为255）位于文件路径中的“.jpg”之前？我曾尝试在谷歌上搜索，但我似乎无法用正确的词来找到任何有用的答案

---

谢谢

您可以使用

pathinfo

功能获取所需的APRT，并使用添加的随机零件重建：

if(file_exists($imgpath1)){
    $pathinfo = pathinfo($imgpath1);
    $imgpath1 = $pathinfo['dirname'] .'/' . $pathinfo['filename'] . $random . '.' . $pathinfo['extension'];
}

尽管您的

$random

变量需要是唯一的id，否则仍然会发生冲突

---

您还需要过滤掉坏字符（服务器上不同文件系统的用户等）。通常，用

uniqid（）替换全名比较容易$路径信息['extension']
您可以尝试以下代码：

$filename = "file.jpg";
$append = "001";

function append_filename($filename, $append) {
    preg_match ("#^(.*)\.(.+?)$#", $filename , $matches);
    return $matches[1].$append.'.'.$matches[2];
}

echo append_filename($filename, $append);

它给出：file001.jpg

（Ctrl+ENTER进行测试）
您可以这样做：

这将提取最后一个时段（$regs[1]）之前的路径和文件名，以及字符串（$regs[2]）结束之前的其他路径和文件名

使用文件名，如/path/subpath/filename.jpg或/path/subpath/filename.saved.jpg等

Regex的意思是：

# ^(.*)\.([^.].*)$
# 
# Assert position at the beginning of the string «^»
# Match the regular expression below and capture its match into     backreference number 1 «(.*)»
#    Match any single character that is not a line break character «.*»
#       Between zero and unlimited times, as many times as possible, giving back as needed (greedy) «*»
# Match the character “.” literally «\.»
# Match the regular expression below and capture its match into backreference number 2 «([^.].*)»
#    Match any character that is NOT a “.” «[^.]»
#    Match any single character that is not a line break character «.*»
#       Between zero and unlimited times, as many times as possible, giving back as needed (greedy) «*»
# Assert position at the end of the string (or before the line break at the end of the string, if any) «$»

在
上分解，获取分解数组的最后一个元素并取消设置数组中的最后一个元素（
数组\u pop
做得很好），使用
内爆所有剩余元素，然后将所有三个部分放在一起。：-）太好了，谢谢！那是我完成了lmao当天的工作
# ^(.*)\.([^.].*)$
# 
# Assert position at the beginning of the string «^»
# Match the regular expression below and capture its match into     backreference number 1 «(.*)»
#    Match any single character that is not a line break character «.*»
#       Between zero and unlimited times, as many times as possible, giving back as needed (greedy) «*»
# Match the character “.” literally «\.»
# Match the regular expression below and capture its match into backreference number 2 «([^.].*)»
#    Match any character that is NOT a “.” «[^.]»
#    Match any single character that is not a line break character «.*»
#       Between zero and unlimited times, as many times as possible, giving back as needed (greedy) «*»
# Assert position at the end of the string (or before the line break at the end of the string, if any) «$»