如何删除 php 中的最后一个元素

$s = '/search/listing.html?vehicle_type=&year=&make_name=&model_name=&loc_type=3&zipcode=641004&distance=100&make_order=ASC';
echo substr($s, 0, strrpos($s, '&'));

编辑：

$url = $base_url.trim( $_SERVER['REQUEST_URI'], "&year_order=".$arr['year_order']."" );
//                                            ^
//                                            |_ replace , with .

修剪应该有效：

$string = "/search/listing.html?vehicle_type=&year=&make_name=&model_name=&loc_type=3&zipcode=641004&distance=100&make_order=ASC";
$string = trim($string, "&make_order=ASC");

不能保证make_order将位于查询字符串的末尾 - 或者根本不存在。要正确删除该字段，您必须使用如下内容：

$url = '/search/listing.html?vehicle_type=&year=&make_name=&model_name=&loc_type=3&zipcode=641004&distance=100&make_order=ASC';
// break down the URL into a path and query string
$parsed = parse_url($url);
// turn the query string into an array that we can manipulate
$qs = array();
parse_str($parsed['query'], $qs);
// remove the unwanted field
unset($qs['make_order']);
// rebuild the URL
$rebuilt = $parsed['path'];
if(!empty($qs)) {
    $rebuilt .= '?' . http_build_query($qs);
}
echo $rebuilt;

$actual_link = "/search/listing.html?vehicle_type=&year=&make_name=&model_name=&loc_type=3&zipcode=641004&distance=100&make_order=ASC";

echo str_replace("&make_order=ASC","",$actual_link);

$string = "/search/listing.html?vehicle_type=&year=&make_name=&model_name=&loc_type=3&zipcode=641004&distance=100&make_order=ASC";
$args = array_pop(explode($string, "&"));
$string = implode("&", $args);

有很多方法。最简单的可能是：

$i=strrpos($text,'&');
$newstring=substr($text,0,$i);

$str = "/search/listing.html?vehicle_type=&year=&make_name=&model_name=&loc_type=3&zipcode=641004&distance=100&make_order=ASC";
echo $str . "<br>";
echo trim($str,"&make_order=ASC");

如果&make_order=ASC总是在最后，你可以使用 strstr(( 来做到这一点

$str = '/search/listing.html?vehicle_type=&year=&make_name=&model_name=&loc_type=3&zipcode=641004&distance=100&make_order=ASC';
echo strstr($str,'&make_order=ASC',true);

从 url 中删除所需的密钥。

用：

$s = '/search/listing.html?vehicle_type=&year=&make_name=&model_name=&loc_type=3&zipcode=641004&distance=100&make_order=ASC';
echo remove_key_from_url($url, 'make_order');

输出：

/search/listing.html?vehicle_type=&year=&make_name=&model_name=&loc_type=3&zipcode=641004&distance=100

法典：

function remove_key_from_url($url, $key) {
    if (strpos($url, '?') === false) return $url;
    list($left, $right) = explode('?', $url, 2);
    parse_str($right, $get);
    if (isset($get[$key])) unset($get[$key]);
    return $left . '?' . http_build_query($get);
}