新手求助获取字符串

[jellday]

1、远程获取文件，并读入变量
代码如下：
function getW($wLink){

if ($fp = fopen($wLink, 'r')) {
$content = '';

while ($line = fread($fp, 1024)) {
$content .= $line;
}
}
return $content;
}

远程文件源代码包含如下代码“
<yw:cdtn text="Fair" code="34" temp="7" date="Thu, 10 Apr 2008 9:50 am BST" />
...
<yw:f day="Thu" date="10 Apr 2008" low="1" high="11" text="Light Rain" code="11" />
<yw:f day="Fri" date="11 Apr 2008" low="1" high="10" text="Light Rain" code="11" />
”
其中"yw:cdtn", "yw:f"关键字为固定不变的, "text", "day", "date", "low", "high"等关键字变化，且yw:f下的day和date与当前相差一天即明天和后天。
yw:cdtn只有一个，yw:f有两个。
2、想获取"yw:cdtn text"的值"Fair"，以及yw:f下面的"day", "low","high","text"的值，并分别存入各个变量。应该怎么办？

[jellday]

"text", "day", "date", "low", "high"等关键字变化
说错了，应该是"text", "day", "date", "low", "high"等关键字的值变化。即远程文件引号内的值是可变的。

[张吉Jerry]

preg_match("/<yw:cdtn.*?\/>/",$content,$matches);
preg_match_all("/(text|code|temp|date)=\"([^\"]+)\"/",$matches[0],$matches,PREG_SET_ORDER);
foreach($matches as $value)	$cdtn[$value[1]]=$value[2];

preg_match_all("/<yw:f.*?\/>/",$content,$matches);
foreach($matches[0] as $key=>$value){
	preg_match_all("/(day|date|low|high|text|code)=\"([^\"]+)\"/",$value,$matches_,PREG_SET_ORDER);
	foreach($matches_ as $value_)	$f[$key][$value_[1]]=$value_[2];
}

var_dump($cdtn);
var_dump($f);

输出结果如下：

array(4) {//$cdtn
  ["text"]=>
  string(4) "Fair"
  ["code"]=>
  string(2) "34"
  ["temp"]=>
  string(1) "7"
  ["date"]=>
  string(28) "Thu, 10 Apr 2008 9:50 am BST"
}
array(2) {//$f
  [0]=>
  array(6) {
    ["day"]=>
    string(3) "Thu"
    ["date"]=>
    string(11) "10 Apr 2008"
    ["low"]=>
    string(1) "1"
    ["high"]=>
    string(2) "11"
    ["text"]=>
    string(10) "Light Rain"
    ["code"]=>
    string(2) "11"
  }
  [1]=>
  array(6) {
    ["day"]=>
    string(3) "Fri"
    ["date"]=>
    string(11) "11 Apr 2008"
    ["low"]=>
    string(1) "1"
    ["high"]=>
    string(2) "10"
    ["text"]=>
    string(10) "Light Rain"
    ["code"]=>
    string(2) "11"
  }
}