Breaking the nested loop
PhpLoopsNested LoopsPhp Problem Overview
I'm having problem with nested loop. I have multiple number of posts, and each post has multiple number of images.
I want to get total of 5 images from all posts. So I am using nested loop to get the images, and want to break the loop when the number reaches to 5. The following code will return the images, but does not seem to break the loop.
foreach($query->posts as $post){
if ($images = get_children(array(
'post_parent' => $post->ID,
'post_type' => 'attachment',
'post_mime_type' => 'image'))
){
$i = 0;
foreach( $images as $image ) {
..
//break the loop?
if (++$i == 5) break;
}
}
}
Php Solutions
Solution 1 - Php
Unlike other languages such as C/C++, in PHP you can use the optional param of break like this:
break 2;
In this case if you have two loops such that:
while(...) {
while(...) {
// do
// something
break 2; // skip both
}
}
break 2
will skip both while loops.
Doc: http://php.net/manual/en/control-structures.break.php
This makes jumping over nested loops more readable than for example using goto
of other languages
Solution 2 - Php
Use a while loop
<?php
$count = $i = 0;
while ($count<5 && $query->posts[$i]) {
$j = 0;
$post = $query->posts[$i++];
if ($images = get_children(array(
'post_parent' => $post->ID,
'post_type' => 'attachment',
'post_mime_type' => 'image'))
){
while ($count < 5 && $images[$j]) {
$count++;
$image = $images[$j++];
..
}
}
}
?>