Suppose i have to divide all 7 bags in 4 container equally by balancing there weight. But i cannot break the bag to manage weight. Here is the function which will do it.

binpacking.php

<?php
$bags = array(60,80,20,10,80,100,90,20,89,830,88);

$containers = array(1=>10000,2=>10000,3=>10000,4=>10000); // number -> free space
$placement = array();

function bestContainerFor($weight) {
    global $containers;
    $rest = 0;
    $out = 0; // in it won't change $weight fits nowhere
    foreach($containers as $nr=>$space) {
        if($space<$weight) continue; // not enough space
        if($space-$weight<$rest) continue; // we have a better case
        $rest = $space-$weight;
        $out = $nr;
    }
    if($out) $containers[$out]-=$weight; // occupy the space
    return $out;
}
 
foreach($bags as $nr=>$w) {
  
    $p = bestContainerFor($w);
    $placement[$nr] = $p; // for later use; in this example it's not needed
    if( $p) print "Bag $nr fits in $p<br>";
    if(!$p) print "Bag $nr fits nowhere<br>";
    $data[$p][]=$bags[$nr];
}
echo '<pre>';
print_r($data);