php foreach preg_match'd line, get next lines - php

Question

I hope the title is self explanatory.
I would like to loop over a xml file line by line, then match a particular line (getting attributes from that line), then get the next X lines after that line.
I have the following code, which attempts to do this, but I cant seem to figure out how to get the next X lines after.
$file = 'Electric.xml';
$lines = file($file);//file in to an array
foreach($lines as $line){
$reads = element_attributes('WINDOW',$line);
if($reads['class'] == 'Bracelets'){
print_r($reads);
}
if($reads['class'] == 'Handbags'){
print_r($reads);
}
}
function element_attributes($element_name, $xml) {
if ($xml == false) {
return false;
}
// Grab the string of attributes inside an element tag.
$found = preg_match('#<'.$element_name.
'\s+([^>]+(?:"|\'))\s?/?>#',
$xml, $matches);
if ($found == 1) {
$attribute_array = array();
$attribute_string = $matches[1];
// Match attribute-name attribute-value pairs.
$found = preg_match_all(
'#([^\s=]+)\s*=\s*(\'[^<\']*\'|"[^<"]*")#',
$attribute_string, $matches, PREG_SET_ORDER);
if ($found != 0) {
// Create an associative array that matches attribute
// names to attribute values.
foreach ($matches as $attribute) {
$attribute_array[$attribute[1]] =
substr($attribute[2], 1, -1);
}
return $attribute_array;
}
}
// Attributes either weren't found, or couldn't be extracted
// by the regular expression.
return false;
}

Answer 1

Use a proper parser, like SimpleXML, to parse the file. Then your issue becomes trivial. The PHP manual contains a tutorial to help you get started.
In this case you just loop over the lines, checking the property of the tag you're looking for, until you find a match. Then, loop over the next # elements, saving them into an array.
Something like this:
$xml = new SimpleXML ("file.xml");
foreach ($xml->node->element as $element) {
if ($element->attribute != "match") {
continue;
}
// If we get here we want to save the next # lines/elements.
}

Answer 2

$linesLength = count($lines);
$XLines = array();
for($index = 0; $index < $linesLength; $index++){
$reads = element_attributes('WINDOW',$line);
if($reads['class'] == 'Bracelets'){
print_r($reads);
$XLines[] = array_slice($array, $index, $X);
$index += $X;
}
if($reads['class'] == 'Handbags'){
print_r($reads);
$XLines[] = array_slice($array, $index, $X);
$index += $X;
}
}