How to uncapture the range of elements in for loop using PHP?

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PHP

Example:

@article{boonzaier2009development,
author = "Boonzaier, A. and Schubach, K. and Troup, K. and Pollard, A. and Aranda, S. and Schofield, P.",
title = "Development of a psychoeducational intervention ",
journal = "Journal of Psychosocial Oncology",
volume = "27",
number = "1",
pages = "136-153",
year = 2009
}

@book{bottoff2008women,
author = "Bottoff, J. L. and Oliffe, J. L. and Halpin, M. and Phillips, M. and McLean, G. and Mroz, L.",
title = "Women and prostate cancer support groups: {The} gender connect? {Social} {Science} & {Medicine}",
publisher = "66",
pages = "1217-1227",
year = 2008
}

@article{bottorff2012gender,
author = "Bottorff, J. L. and Oliffe, J. L. and Kelly, M.",
title = "The gender (s) in the room",
journal = "Qualitative Health Research",
volume = "22",
number = "4",
pages = "435-440",
year = 2012
}
I want to capture the string between double quotes of @article part only. Am getting the count of @article and range of @article fields to get the values of @article elements. Using for loop am getting values of @article (for loop values: range of @article to next @article and so on) The problem is, for example first string @article is in 10th line and second one is in 18 th line, am doing for loop between this range and getting the value but, inbetween @book also is there so how to eliminate that @book range of lines in for loop. Because it captures @book elements also as it is inside in the range of @article.

php code:

<?php
$file=file("master.bib");
$typeart=array();
$cont=array();

//count of article
$key = '@article';
foreach ($file as $l => $line) {
    if (strpos($line,$key) !== false) {
       $l++;
       $typeart[]= $l;

          }
}//end-count of article

$counttypeart=count($typeart);

for($j=0;$j<$counttypeart;$j++){

    for($i=$typeart[$j];$i<$typeart[$j+1];$i++){
if(strpos($file[$i],'author')){
preg_match('/\"(.*?)\"/',$file[$i],$cont);
$author= $cont[1];
echo $author;
echo ;
}
if(strpos($file[$i],'title')){
preg_match('/\"(.*?)\"/',$file[$i],$cont);
$title= $cont[1];
echo $title;
echo ;
}
if(strpos($file[$i],'journal')){
preg_match('/\"(.*?)\"/',$file[$i],$cont);
$journal= $cont[1];
echo $journal;
echo ;
}

if(strpos($file[$i],'volume')){
preg_match('/\"(.*?)\"/',$file[$i],$cont);
$volume= $cont[1];
echo $volume;
echo ;
}

if(strpos($file[$i],'number')){
preg_match('/\"(.*?)\"/',$file[$i],$cont);
$number= $cont[1];
echo $number;
echo ;
}

if(strpos($file[$i],'pages')){
preg_match('/\"(.*?)\"/',$file[$i],$cont);
$pages= $cont[1];
echo $pages;
echo ;
echo ;
}
}
}

?>

Expected output (From above mentioned example):

Boonzaier, A. and Schubach, K. and Troup, K. and Pollard, A. and Aranda, S. and Schofield P.
Development of a psychoeducational intervention for men with prostate cancer
Journal of Psychosocial Oncology
27
1
136-153


Bottorff, J. L. and Oliffe, J. L. and Kelly, M.
The gender (s) in the room
Qualitative Health Research
22
4
435-440