php : move an element having a certain attribute value at the end of the array [duplicate]

Question

i have sorted an array of travel products by price . i'd like to move the products with a price =0 at the end of the list.

Here is what i have tried:

        for($i = 0; $i < count($mes_voyages); ++$i) {

            if($mes_voyages[i]['prix']==0) 
            {

                array_push($mes_voyages,$mes_voyages[i]);
                unset($mes_voyages[i]);

            }

        }

This is probably pseudo-code, but in case you didn't know: PHP variables start with $. — Amal
– Amal, Commented Nov 6, 2013 at 16:12
You will skip every item that comes after an item with price 0 this way ;-) — Christine
– Christine, Commented Nov 6, 2013 at 16:23

Alma Do · Accepted Answer · 2013-11-06 16:20:17Z

3

So that will be:

$mes_voyages = array_merge(
   array_filter($mes_voyages, function($item){ return $item['prix']!=0; }),
   array_filter($mes_voyages, function($item){ return $item['prix']==0; })
);

answered Nov 6, 2013 at 16:20

Alma Do

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1 Comment

mickmackusa Feb 21 at 4:56

The second array_filter() is avoidable if you merge the filtered array with the original array using the array union operator.

Sébastien Renauld · Accepted Answer · 2013-11-06 16:21:18Z

2

There's a much cleaner solution:

usort($mes_voyages, function($a,$b) {
     if ($a["prix"] === 0 && $a["prix"] != $b["prix"]) return 1;
});

answered Nov 6, 2013 at 16:21

Sébastien Renauld

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3 Comments

Alma Do Over a year ago

Hm. Not sure that will do the stuff. Sorting callback function should return full set -1 or 0 or 1 for proper result. That need to be tested properly

Matoeil Over a year ago

it does not work combined with my previous treatment to the array which is function cmp($a, $b) {if ($a["prix"] == $b["prix"]) { return 0; } return ($a["prix"] < $b["prix"] ) ? -1 : 1; } usort($mes_voyages, "cmp");

mickmackusa Feb 21 at 4:55

2-way return values in usort()'s callback will result in more iterations under the hood as more ties will need to be broken. usort()'s callback should always return the result of a 3-way comparison.

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