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Matching an XHTML/XML tag with a certain attribute value

/ Published in: PHP
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  1. function get_tag( $attr, $value, $xml, $tag=null ) {
  2.   if( is_null($tag) )
  3.     $tag = '\w+';
  4.   else
  5.     $tag = preg_quote($tag);
  6.  
  7.   $attr = preg_quote($attr);
  8.   $value = preg_quote($value);
  9.  
  10.   $tag_regex = "/<(".$tag.")[^>]*$attr\s*=\s*".
  11.                 "(['\"])$value\\2[^>]*>(.*?)<\/\\1>/"
  12.  
  13.   preg_match_all($tag_regex,
  14.                  $xml,
  15.                  $matches,
  16.                  PREG_PATTERN_ORDER);
  17.  
  18.   return $matches[3];
  19. }

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