$url = 'http://www.abc.com/def/git//ss';
$url = preg_replace('/([^:])(\/{2,})/', '$1/', $url);
// output http://www.abc.com/def/git/ss

$url = 'https://www.abc.com/def/git//ss';
$url = preg_replace('/([^:])(\/{2,})/', '$1/', $url);
// output https://www.abc.com/def/git/ss

在正则表达式中使用加号+意味着前面的一个或多个字符的出现。所以我们可以在preg_replace中添加它，以将一个或多个/的出现替换为其中之一

$url =  "site.com/edition/new///";

$newUrl = preg_replace('/(\/+)/','/',$url);

// now it should be replace with the correct single forward slash
echo $newUrl

简单，看看这个例子：

$url ="http://portal.lojav1.local//Settings////messages";
echo str_replace(':/','://', trim(preg_replace('/\/+/', '/', $url), '/'));

输出：

http://portal.lojav1.local/Settings/messages

编辑：哈我把这个问题读成“没有preg”哦好吧：3

function removeabunchofslashes($url){
  $explode = explode('://',$url);
  while(strpos($explode[1],'//'))
    $explode[1] = str_replace('//','/',$explode[1]);
  return implode('://',$explode);
}

echo removeabunchofslashes('http://www.site.com/edition////new///');

http://domain.com/test/test/〉http://domain.com/test/test

# Strip trailing slash(es) from uri
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.+?)[/]+$ $1 [NC,R,L]

http://domain.com//test//test//〉http://domain.com/test/test/

# Merge multiple slashes in uri
RewriteCond %{THE_REQUEST} ^[A-Z]+\ //*(.+)//+(.*)\ HTTP
RewriteRule ^ /%1/%2 [R,L]
RewriteCond %{THE_REQUEST} ^[A-Z]+\ //+(.*)\ HTTP
RewriteRule ^ /%1 [R,L]

如果测试后一切正常，则将R更改为R=301...
有谁知道如何使用上述方法在查询中保留双斜杠？
(For例如：/test//test//？test=test//test〉/test/test/？test=test//test）

domain.com//test//test/?test/test 〉网站domain.com/test/test/

RewriteCond %{THE_REQUEST} ^[A-Z]+\ //*(.+)//+(.*)\ HTTP
RewriteRule ^ /%1/%2? [R,L]
RewriteCond %{THE_REQUEST} ^[A-Z]+\ //+(.*)\ HTTP
RewriteRule ^ /%1? [R,L]