好吧，删除所有变量，也许最漂亮的是
$url = strtok($url, '?');
请看
strtok这里。
它是最快的（请参见下文），并且在处理网址时不带“？” 正确地。
要采用url + querystring并仅删除一个变量（不使用regex替换，在某些情况下可能会更快），您可以执行以下操作：
function removeqsvar($url, $varname) { list($urlpart, $qspart) = array_pad(explode('?', $url), 2, ''); parse_str($qspart, $qsvars); unset($qsvars[$varname]); $newqs = http_build_query($qsvars); return $urlpart . '?' . $newqs;}用正则表达式替换删除单个var可能类似于：
function removeqsvar($url, $varname) { return preg_replace('/([?&])'.$varname.'=[^&]+(&|$)/','$1',$url);}以下是几种不同方法的计时，以确保在运行之间重置计时。
<?php$number_of_tests = 40000;$mtime = microtime();$mtime = explode(" ",$mtime);$mtime = $mtime[1] + $mtime[0];$starttime = $mtime;for($i = 0; $i < $number_of_tests; $i++){ $str = "http://www.example.com?test=test"; preg_replace('/\?.*/', '', $str);}$mtime = microtime();$mtime = explode(" ",$mtime);$mtime = $mtime[1] + $mtime[0];$endtime = $mtime;$totaltime = ($endtime - $starttime);echo "regexp execution time: ".$totaltime." seconds; ";$mtime = microtime();$mtime = explode(" ",$mtime);$mtime = $mtime[1] + $mtime[0];$starttime = $mtime;for($i = 0; $i < $number_of_tests; $i++){ $str = "http://www.example.com?test=test"; $str = explode('?', $str);}$mtime = microtime();$mtime = explode(" ",$mtime);$mtime = $mtime[1] + $mtime[0];$endtime = $mtime;$totaltime = ($endtime - $starttime);echo "explode execution time: ".$totaltime." seconds; ";$mtime = microtime();$mtime = explode(" ",$mtime);$mtime = $mtime[1] + $mtime[0];$starttime = $mtime;for($i = 0; $i < $number_of_tests; $i++){ $str = "http://www.example.com?test=test"; $qPos = strpos($str, "?"); $url_without_query_string = substr($str, 0, $qPos);}$mtime = microtime();$mtime = explode(" ",$mtime);$mtime = $mtime[1] + $mtime[0];$endtime = $mtime;$totaltime = ($endtime - $starttime);echo "strpos execution time: ".$totaltime." seconds; ";$mtime = microtime();$mtime = explode(" ",$mtime);$mtime = $mtime[1] + $mtime[0];$starttime = $mtime;for($i = 0; $i < $number_of_tests; $i++){ $str = "http://www.example.com?test=test"; $url_without_query_string = strtok($str, '?');}$mtime = microtime();$mtime = explode(" ",$mtime);$mtime = $mtime[1] + $mtime[0];$endtime = $mtime;$totaltime = ($endtime - $starttime);echo "tok execution time: ".$totaltime." seconds; ";表演
regexp execution time: 0.14604902267456 seconds; explode execution time: 0.068033933639526 seconds; strpos execution time: 0.064775943756104 seconds; tok execution time: 0.045819044113159 seconds; regexp execution time: 0.1408839225769 seconds; explode execution time: 0.06751012802124 seconds; strpos execution time: 0.064877986907959 seconds; tok execution time: 0.047760963439941 seconds; regexp execution time: 0.14162802696228 seconds; explode execution time: 0.065848112106323 seconds; strpos execution time: 0.064821004867554 seconds; tok execution time: 0.041788101196289 seconds; regexp execution time: 0.14043688774109 seconds; explode execution time: 0.066350221633911 seconds; strpos execution time: 0.066242933273315 seconds; tok execution time: 0.041517972946167 seconds; regexp execution time: 0.14228296279907 seconds; explode execution time: 0.06665301322937 seconds; strpos execution time: 0.063700199127197 seconds; tok execution time: 0.041836977005005 seconds;
strtok获胜，并且是迄今为止最小的代码。
