用PHP删除GET变量的美妙方法？

Question

我有一个包含完整URL的字符串,包括GET变量.哪个是删除GET变量的最佳方法？有没有一种很好的方法可以删除其中一种？

这是一个有效但不是很漂亮的代码(我认为):

$current_url = explode('?', $current_url);
echo $current_url[0];

上面的代码只删除所有GET变量.在我的情况下,URL是从CMS生成的,因此我不需要任何有关服务器变量的信息.

Answer 1

好的,要删除所有变量,也许是最漂亮的

$url = strtok($url, '?');

看到strtok这里.

它是最快的(见下文),并处理网址没有'？' 正常.

要获取url + querystring并仅删除一个变量(不使用正则表达式替换,在某些情况下可能更快),您可能会执行以下操作:

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;
}

删除单个var的正则表达式替换可能如下所示:

function removeqsvar($url, $varname) {
    return preg_replace('/([?&])'.$varname.'=[^&]+(&|$)/','$1',$url);
}

下面介绍几种不同方法的时间,确保在运行之间重置时间.

<?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; ";

节目

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,是迄今为止最小的代码.

Answer 2

怎么样:

preg_replace('/\\?.*/', '', $str)

Answer 3

如果您尝试从中删除查询字符串的URL是PHP脚本的当前URL,则可以使用前面提到的方法之一.如果您只有一个带有URL的字符串变量,并且您想要去除"？"之外的所有内容.你可以做:

$pos = strpos($url, "?");
$url = substr($url, 0, $pos);

Answer 4

受@MitMaro评论的启发,我写了一个小基准来测试@Gumbo,@ Matt Bridges和@justin解决方案的速度问题:

function teststrtok($number_of_tests){
    for($i = 0; $i < $number_of_tests; $i++){
      $str = "http://www.example.com?test=test";
      $str = strtok($str,'?');
    }
}
function testexplode($number_of_tests){
    for($i = 0; $i < $number_of_tests; $i++){
      $str = "http://www.example.com?test=test";
      $str = explode('?', $str);
    }
}
function testregexp($number_of_tests){
    for($i = 0; $i < $number_of_tests; $i++){
      $str = "http://www.example.com?test=test";
      preg_replace('/\\?.*/', '', $str);
    }
}
function teststrpos($number_of_tests){
    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);
    }
}

$number_of_runs = 10;
for($runs = 0; $runs < $number_of_runs; $runs++){

  $number_of_tests = 40000;
  $functions = array("strtok", "explode", "regexp", "strpos");
  foreach($functions as $func){
    $starttime = microtime(true);
    call_user_func("test".$func, $number_of_tests);
    echo $func.": ". sprintf("%0.2f",microtime(true) - $starttime).";";
  }
  echo "<br />";
}

strtok: 0.12;explode: 0.19;regexp: 0.31;strpos: 0.18;
strtok: 0.12;explode: 0.19;regexp: 0.31;strpos: 0.18;
strtok: 0.12;explode: 0.19;regexp: 0.31;strpos: 0.18;
strtok: 0.12;explode: 0.19;regexp: 0.31;strpos: 0.18;
strtok: 0.12;explode: 0.19;regexp: 0.31;strpos: 0.18;
strtok: 0.12;explode: 0.19;regexp: 0.31;strpos: 0.18;
strtok: 0.12;explode: 0.19;regexp: 0.31;strpos: 0.18;
strtok: 0.12;explode: 0.19;regexp: 0.31;strpos: 0.18;
strtok: 0.12;explode: 0.19;regexp: 0.31;strpos: 0.18;
strtok: 0.12;explode: 0.19;regexp: 0.31;strpos: 0.18;

结果:@ justin的strtok是最快的.

注意:使用Apache2和PHP5在本地Debian Lenny系统上进行测试.

Answer 5

另一个解决方案......我发现这个功能更优雅,它还会删除尾随的'？' 如果要删除的密钥是查询字符串中唯一的密钥.

/**
 * Remove a query string parameter from an URL.
 *
 * @param string $url
 * @param string $varname
 *
 * @return string
 */
function removeQueryStringParameter($url, $varname)
{
    $parsedUrl = parse_url($url);
    $query = array();

    if (isset($parsedUrl['query'])) {
        parse_str($parsedUrl['query'], $query);
        unset($query[$varname]);
    }

    $path = isset($parsedUrl['path']) ? $parsedUrl['path'] : '';
    $query = !empty($query) ? '?'. http_build_query($query) : '';

    return $parsedUrl['scheme']. '://'. $parsedUrl['host']. $path. $query;
}

测试:

$urls = array(
    'http://www.example.com?test=test',
    'http://www.example.com?bar=foo&test=test2&foo2=dooh',
    'http://www.example.com',
    'http://www.example.com?foo=bar',
    'http://www.example.com/test/no-empty-path/?foo=bar&test=test5',
    'https://www.example.com/test/test.test?test=test6',
);

foreach ($urls as $url) {
    echo $url. '<br/>';
    echo removeQueryStringParameter($url, 'test'). '<br/><br/>';
}

将输出:

http://www.example.com?test=test
http://www.example.com

http://www.example.com?bar=foo&test=test2&foo2=dooh
http://www.example.com?bar=foo&foo2=dooh

http://www.example.com
http://www.example.com

http://www.example.com?foo=bar
http://www.example.com?foo=bar

http://www.example.com/test/no-empty-path/?foo=bar&test=test5
http://www.example.com/test/no-empty-path/?foo=bar

https://www.example.com/test/test.test?test=test6
https://www.example.com/test/test.test

»在3v4l上运行这些测试