如何有效地添加GET参数？或者用PHP？

Question

我必须在网址中添加一个GET变量.但是URL可能已经有了GET变量.添加这个新变量的最有效方法是什么？

示例网址:

http://domain.com/
http://domain.com/index.html?name=jones

我需要添加tag=xyz::

http://domain.com/?tag=xyz
http://domain.com/index.html?name=jones&tag=xyz

知道是否在我的字符串前加上一个最有效的方法是什么？要么 &？

这是我到目前为止的功能版本:

// where arrAdditions looks like array('key1'=>'value1','key2'=>'value2');
function appendUrlQueryString($url, $arrAdditions) {
    $arrQueryStrings = array();
    foreach ($arrAdditions as $k=>$v) {
        $arrQueryStrings[] = $k . '=' . $v;
    }
    $strAppend = implode('&',$arrQueryStrings);
    if (strpos($url, '?') !== false) {
        $url .= '&' . $strAppend;
    } else {
        $url = '?' . $strAppend;
    }
    return $url;
}

但是,只是在寻找?现有网址中的问题？例如,网址是否包含?但不是实际查询,可能是转义字符？

Answer 1

看看PHP PECL的http_build_url.由doc页面说:

建立一个URL.

根据flags参数,第二个URL的部分将合并到第一个URL中.

加成:

如果您没有安装PECL,我们可以跳过一些箍.在我们尝试重建新URL之前,这种方法有点可靠.股票PHP(减去PECL)没有相反的parse_url().使其变得更难,parse_url()从结果零件数组中的URL中删除一些语法,这样我们就必须在重新组装时将它们放回去.http_build_url()可以为我们照顾这个,但如果它可用,你将不会阅读这部分,因为它是我最初推荐的.无论如何,这是代码:

<?php
/**
 * addQueryParam - given a URL and some new params for its query string, return the modified URL
 * 
 * @see http://us1.php.net/parse_url
 * @see http://us1.php.net/parse_str
 * @throws Exception on bad input
 * @param STRING $url A parseable URL to add query params to
 * @param MIXED $input_query_vars - STRING of & separated pairs of = separated key values OR ASSOCIATIVE ARRAY of STRING keys => STRING values
 * @return STRING new URL
 */
function addQueryParam ($url, $input_query_vars) {
    // Parse new parameters
    if (is_string($input_query_vars)) {
        parse_str($input_query_vars, $input_query_vars);
    }

    // Ensure array of parameters now available
    if (!is_array($input_query_vars)) {
        throw new Exception(__FUNCTION__ . ' expects associative array or query string as second parameter.');
    }

    // Break up given URL
    $url_parts = parse_url($url);

    // Test for proper URL parse
    if (!is_array($url_parts)) {
        throw new Exception(__FUNCTION__ . ' expects parseable URL as first parameter');
    }

    // Produce array of original query vars
    $original_query_vars = array();
    if (isset($url_parts['query']) && $url_parts['query'] !== '') {
        parse_str($url_parts['query'], $original_query_vars);
    }

    // Merge new params inot original
    $new_query_vars = array_merge($original_query_vars, $input_query_vars);

    // replace the original query string
    $url_parts['query'] = http_build_query($new_query_vars);

    // Put URL grammar back in place
    if (!empty($url_parts['scheme'])) {
        $url_parts['scheme'] .= '://';
    }

    if (!empty($url_parts['query'])) {
        $url_parts['query'] = '?' . $url_parts['query'];
    }

    if (!empty($url_parts['fragment'])) {
        $url_parts['fragment'] = '#' . $url_parts['fragment'];
    }

    // Put it all back together and return it
    return implode('', $url_parts);
}

// Your demo URLs
$url1 = 'http://domain.com/';
$url2 = 'http://domain.com/index.html?name=jones';

//Some usage (I did this from CLI)
echo $url1, "\n";
echo addQueryParam($url1, 'tag=xyz'), "\n";
echo addQueryParam($url1, array('tag' => 'xyz')), "\n";

echo $url2, "\n";
echo addQueryParam($url2, 'tag=xyz'), "\n";
echo addQueryParam($url2, array('tag' => 'xyz')), "\n";
echo addQueryParam($url2, array('name' => 'foo', 'tag' => 'xyz')), "\n";