字符串解析帮助

Question

I have a paragraph of text in the following format:

  text text text <age>23</age>. text text <hobbies>...</hobbies>

I want to be able to

1) Extract the text found between each <age> and <hobbies> tag found in the string. So for example, I would have an array called $ages which will contain all ages found between all the <age></age> tags, and then another array $hobbies which will have the text between the <hobbies></hobbies> tags found throughout the string.

2) Be able to replace the tags which are extracted with a marker, such as {age_444}, so e.g the above text would become

  text text text {age_444}. text text {hobbies_555}

How can this be done?

Answer 1

//Extract the age
preg_match_all("#<age>(.*?)</age>#",$string,$match);
$ages=$match[1];
//Extract the hobby
preg_match_all("#<hobbies>(.*?)</hobbies>#",$string,$match);
$hobbies=$match[1];

//Replace the age
$agefn=create_function('$match','$query=mysql_query("select ageid...where age=".$match[1]); return "<age>{age_".mysql_fetch_object($query)->ageid."}</age>"');
$string=preg_replace_callback("#<age>(.*?)</age>#",$agefn,$string);

//Replace the hobby
$hobfn=create_function('$match','$query=mysql_query("select hobid...where hobby=".$match[1]); return "<hobbies>{hobbies_".mysql_fetch_object($query)->hobid."}</hobbies>"');
$string=preg_replace_callback("#<hobbies>(.*?)</hobbies>#",$hobfn,$string);