Foreach break and continue in PHP - php

Question

I am facing an problem. I have built a foreach loop in PHP:
<?php $show = false; ?>
<?php foreach ($this->items as $item) : ?>
But I want to echo the first 20 items and continue with the following 16 items.
I have managed to make it to do a break after 20 items but I am not getting the following 16 items ( starting from nr 21 ).
This is what I have so far:
<?php $show = false; ?>
<?php $i = $item->id = 1; ?>
<?php foreach ($this->items as $item) : ?>
<?php if(++$i > 20) break; ?>
If I set $i to '21' it still echos item 1 and so on.
Solution ## Thanks to #dhavald
<?php $show = false; ?>
<?php foreach (array_slice ($this->items, 0, 20) as $item) : ?>
By placing an array_slice in the foreach you can control the items you want show.
So on the next div i want to show item 21 to 36, the only thing i had to change was the 0 and 20 into , 20, 36
To clarify what I am looking for, I have three divs where I want to echo some items onto it. If an user collapse a div on the first there will appear the first 20 items and if a user clicks div2 the next 16 items will appear.
How can I correct this code to make that happen?
As i forgotten to mention, the solutions you bring on helped me really to understand the process but as i used a component generator for Joomla 3.1 there is one row of code that make it a little bit more complex to call the first 20 and second 16 items.
Directly after the foreach loop there is this line of code
if($item->state == 1 || ($item->state == 0 && JFactory::getUser()>authorise('core.edit.own',' com_ncitycatemus.vraagantwoordtoevoegen.'.$item->id))):
$show = true;
How can i manage it than with the loop ? Or do you suggest another way?
Thanks in advance! Really helped me to understand the loop!!

Answer 1

break breaks out of and stops a loop. continue skips the rest of the code in the loop, and jumps to the next iteration.
Using break and continue is in my opinion the wrong approach here. I'd simply use two for loops:
$keys = array_keys($this->items);
$keysLength = count($keys);
echo '<div id="div1">';
for ($i = 0; $i < min($keysLength, 20); $i++) {
echo $this->items[$keys[$i]];
}
echo '</div>';
if ($keysLength >= 20) {
echo '<div id="div2">';
for ($i = 20; $i < min($keysLength, 36); $i++) { //36 being 20 + 16
echo $this->items[$keys[$i]];
}
echo '</div>';
}
Note: This will work with any amount of items in $this->items. If it's under 20, it'll simply skip the next 16, and if it's above 36, it'll simply ignore the rest.

Answer 2

you can use array_slice to get a part of $this->items array and assign it into 3 different variables and loop over them separately.
$itemsDiv1 = array_slice($this->items, 0, 20); // gives first 20 items
$itemsDiv2 = array_slice($this->items, 20, 16); // gives next 16 items
and so on..

Answer 3

Don't use break; use continue;

Answer 4

<?php $i = 0; ?>
<!-- first group -->
<div>
<?php foreach ($this->items as $item) : ?>
<?php
/**
* Check if count divided by 20 has no remainder
*/
if ( (++$i % 20) == 0 ): ?>
</div>
<!-- start new group -->
<div>
<?php endif ?>
<?php endforeach ?>
<!-- end last group -->
</div>

Answer 5

$stockNotNull = StockDetail::where('sku', 10101001)
->where('stock_quantity', '>', 0)->get('stock_id', 'stock_quantity');
$toSell = 14;
// decrements just once for each $stockNotNull
foreach ($stockNotNull as $product) {
if ($toSell < 1) {
return;
}
$product->decrement('stock_quantity');
// $product->stock_quantity--; returns with a null
// dump($product->stock_quantity);
$product->save();
$toSell--;
// dump($toSell);
if($product->stock_quantity === 0) {
continue;
}
}
This is what I got so far, decrementing in the usual manner i.e $variable-- gives me a null value, $product->decrement('stock_quantity') subtracts 1 on each run, even if the stock_quantity field is far greater than the $toSell variable. The logic is there in my head, I'm just having trouble taking the quantity from the current item and moving on to the next only when the stock_quantity is 0.