php –multidimensional array and looping
Question
I have a site with the collection of books ; each book have a its own information page (like http://mybookscollection.com/book.php?iditem=2 ).
<html>
<body>
<div class="book">
<div id="author">Author</div>
<div id="title">Title</div>
<div id="date">Date</div>
</div>
</body>
</html>
I want to extract all books information and put this in a txt file like this.
1; Author1; Title1; Date1
2; Author2; Title2; Date2
3; Author3; Title3; Date3
To parse my html page I use "PHP Simple HTML DOM Parser" from http://simplehtmldom.sourceforge.net/
My php code is
<?php
// include HTML DOM Parser from http://simplehtmldom.sourceforge.net/
include ('simple_html_dom.php');
// make a loop for looking the first ten books
for ($i=1; $i<=10; $i++)
{
// look a book page by id
$url = 'http://mybookscollection.com/book.php?iditem='.$i;
$html = file_get_html($url);
// parse the htmls content to get a data
foreach($html->find('div[id=author]') as $element)
{$author = $element->plaintext;}
foreach($html->find('div[id=title]') as $element)
{$title = $element->src;}
foreach($html->find('div[id=date]') as $element)
{$date = $element->plaintext;}
// put all one book's data in the array "book"
$book = implode(";", array($i, $author, $title, $date));
// HERE NEED TO CREAT A NEW ARRAY "COLLECTION" WHERE PUT ALL "BOOK"'S ARRAY
//use echo to print data in the browser
//echo '<div>'. $book .'</div>';
//write a file with all data
$fp = fopen('result.txt', 'w');
// NORMALY HAVE TO PUT HERE "$COLLECTION" NOT JUST ONE "$BOOK"
fwrite($fp, $book);
fclose($fp);
}
?>
It works fine and I get all my data . My problem is that I can't put tougher (in the same array "collection") each book's array to print all books information in the same txt file. I know it's a noobie question about a two multidimensional array but I can't figure it out. Many thanks for your help!
3 answers
solution1
2 ACCPTED 2013-09-26 09:59:13
You are opening the file for every book. Just open it before the loop and close it after the loop.
<?php
// include HTML DOM Parser from http://simplehtmldom.sourceforge.net/
include ('simple_html_dom.php');
// make a loop for looking the first ten books
$fp = fopen('result.txt', 'w');
for ($i=1; $i<=10; $i++)
{
// look a book page by id
$url = 'http://mybookscollection.com/book.php?iditem='.$i;
$html = file_get_html($url);
// parse the htmls content to get a data
foreach($html->find('div[id=author]') as $element)
{$author = $element->plaintext;}
foreach($html->find('div[id=title]') as $element)
{$title = $element->src;}
foreach($html->find('div[id=date]') as $element)
{$date = $element->plaintext;}
// put all one book's data in the array "book"
$book = implode(";", array($i, $author, $title, $date));
fwrite($fp, $book);
fwrite($fp, "\n"); # write a newline
}
fclose($fp);
?>
solution2
1 2013-09-26 10:03:39
Initialize an array
$collection=array();
Then within your loop
array_push($collection,$book);
and you will have an array of books :)
solution3
0 2013-09-26 10:02:45
So you mean:
// collection of all books
// you have to put this line OUTSIDE your loop, so in front of it
$books = array();
//
//add the next book to books collection
// $books[] = $book;
results in:
// your current book code
$book = implode(";", array($i, $author, $title, $date));
//
// add book to books collection
$books[] = $book;
to be corrected:
You should now write your file (in one go) outside the loop!
or ... just go with what you have without a collection array and "append" data to your file.
(For this see http://php.net/manual/en/function.fopen.php with "mode" option 'a' [plus b for windows])
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