如果我使用的是动态url后面会带上如a.php?a=1&b=2这种,那么我要提取a,b参数名与参数值要怎么操作呢,下面我来介绍一个自己用的实例.
在已知参数名的情况下,获取参数值,使用正则表达式能很容易做到,js的实现方法如下,代码如下:
<?php
function getValue(url, name) {
var reg = new RegExp('(?|&)' + name + '=([^&?]*)', 'i');
var arr = url . match(reg);
if (arr) {
return arr[2];
}
return null;
}
?>如果想获取所有的参数名和其对应的值,同样也可以使用正则表达式的方法,js实现方法,代码如下:
<?php
function getKeyValue(url) {
var result = {};
var reg = new RegExp('([?|&])(.+?)=([^&?]*)', 'ig');
var arr = reg.exec(url);
while (arr) {
result[arr[2]] = arr[3];
arr = reg.exec(url);
}
return result;
}
?>注意在js中用于匹配的还有一个叫match，match是字符串的方法,而exec是RegExp对象的方法,使用字符串的match方法,同时正则表达式指定为全局匹配,那么正则表达式中的分组将没有用,返回的结果是所有匹配正则表达式的子字符串,exec方法没有使用全局匹配标志时,返回的时间第一个匹配的子字符,如果使用了全局匹配标志,第一次执行从头开始匹配符号的字符串,再次调用,就从上一次匹配结果后开始匹配.
下面提供php的实现方法,代码如下:
<?php
function getKeyValue($url) {
$result = array();
$mr = preg_match_all('/(?|&)(.+?)=([^&?]*)/i', $url, $matchs);
if ($mr !== FALSE) {
for ($i = 0; $i < $mr; $i++) {
$result[$matchs[2][$i]] = $matchs[3][$i];
}
}
return $result;
}
?>php的preg_match_all方法把匹配的结果存放在第三个指定的参数中,是一个二维数组,第一维度是分组信息的数组,即第一个数组存放的是所有匹配的完整字符串,第二个数组存放的是第一个()对应的值得,第二维度是分组的值.
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