XPath 正则表达式与 preg_match 结合
我的代码中有一个简单但不可见的（对我来说）错误。你能帮助我吗？
在我的 php 文件中使用此代码：
$location = $xpath2->query("//script")->item(1)->textContent;
我得到（选择）此：
<script class="" type="text/javascript">
//<![CDATA[
var html = '';
var lat = 44.793530904744074;
var lang = 20.5364727973938;
if (GBrowserIsCompatible())
{
var map = new GMap2(document.getElementById("map_canvas"));
var ct = new GLatLng(lat, lang);
map.setCenter(ct, 15);
map.addControl( new GSmallMapControl() );
//map.addControl( new GHierarchicalMapTypeControl () );
var gm=new GMarker(ct);
if(html != '') {
GEvent.addListener(gm, "click", function() {
this.openInfoWindowHtml( html );
});
}
map.addOverlay(gm);
map.enableContinuousZoom();
map.enableInfoWindow();
}
//]]>
</script>
然后我尝试使用此代码获取“lat”和“lang”：
$location = $xpath2->query("//script")->item(1)->textContent;
preg_match('/var\s+lat\s+=\s+(\d+\.\d+)\s*;/', $location, $lat);
preg_match('/var\s+lang\s+=\s+(\d+\.\d+)\s*;/', $location, $lng);
$data['lat'] = $lat[1];
$data['lng'] = $lng[1];
但始终显示 lat 和 lang 是 0、0，而它们应该是 44.34534 和 20.5345。
请帮忙！你认为我错的地方（我的英语不是很好，对此感到抱歉）
I have a simple but invisible (for me) error in code. Can you help me?
With this code in my php file:
$location = $xpath2->query("//script")->item(1)->textContent;
I got (select) this:
<script class="" type="text/javascript">
//<![CDATA[
var html = '';
var lat = 44.793530904744074;
var lang = 20.5364727973938;
if (GBrowserIsCompatible())
{
var map = new GMap2(document.getElementById("map_canvas"));
var ct = new GLatLng(lat, lang);
map.setCenter(ct, 15);
map.addControl( new GSmallMapControl() );
//map.addControl( new GHierarchicalMapTypeControl () );
var gm=new GMarker(ct);
if(html != '') {
GEvent.addListener(gm, "click", function() {
this.openInfoWindowHtml( html );
});
}
map.addOverlay(gm);
map.enableContinuousZoom();
map.enableInfoWindow();
}
//]]>
</script>
Then I try to fetch 'lat' and 'lang' with this code:
$location = $xpath2->query("//script")->item(1)->textContent;
preg_match('/var\s+lat\s+=\s+(\d+\.\d+)\s*;/', $location, $lat);
preg_match('/var\s+lang\s+=\s+(\d+\.\d+)\s*;/', $location, $lng);
$data['lat'] = $lat[1];
$data['lng'] = $lng[1];
But always show that lat and lang is 0, 0 when they should be 44.34534 and 20.5345.
PLEASE HELP! where you think that I'm wrong (my English is not very well, sorry for that)
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评论（2）
也许像下面这样。尽管您正在尝试解析 JavaScript，但要小心。
preg_match(
'/(?:^|(?<=\s))var\s+lat \s* = \s* (?=[^;]*\d) ([+-]? \d*\.?\d*)\s*; /x', $location, $lat);preg_match(
'/(?:^|(?<=\s))var\s+lang\s* = \s* (?=[^;]*\d) ([+-]? \d*\.?\d*)\s*; /x', $location, $lng);运行示例： http://www.ideone.com/SEgVb
或者，尝试获取更多一般信息:
preg_match(
'/(?:^|(?<=\s))var\s+lat \s*=\s* ([^;]*) \s*; /x', ...Maybe something like below. Beware though you're trying to parse JavaScript.
preg_match(
'/(?:^|(?<=\s))var\s+lat \s* = \s* (?=[^;]*\d) ([+-]?\d*\.?\d*)\s*; /x', $location, $lat);preg_match(
'/(?:^|(?<=\s))var\s+lang\s* = \s* (?=[^;]*\d) ([+-]?\d*\.?\d*)\s*; /x', $location, $lng);Run sample: http://www.ideone.com/SEgVb
Or, just try to get more general information:
preg_match(
'/(?:^|(?<=\s))var\s+lat \s*=\s* ([^;]*) \s*; /x', ...尝试这样：
[\d.-]+ 匹配任何带有数字的组。或 - （纬度/经度可以为负）
Try like this:
The [\d.-]+ matches any group with numbers . or - (lat/lon can be negative)