php sort array by amount of items? - php

Question

I have a multi-dimension array of australian states, and inside each state there are items. I was wondering if it were possible to reorder an array so the states with the most amount of items are displayed first?
Here's my array, any help would be appreciated :)
[ACT] => Array
(
[0] => stdClass Object
(
[id] => 14
[name] => Burning Log Megastore
[state] => ACT
[classid] => 1
)
[1] => stdClass Object
(
[id] => 21
[name] => Fyshwick Home & Heating
[state] => ACT
[classid] => 1
)
)
[NSW] => Array
(
[0] => stdClass Object
(
[id] => 36
[name] => A1 Hot Wood
[state] => NSW
[classid] => 11
)
[1] => stdClass Object
(
[id] => 40
[name] => Abbey Fireplaces
[state] => NSW
[classid] => 1
)
[2] => stdClass Object
(
[id] => 55
[name] => Almighty Firewood
[state] => NSW
[classid] => 11
)
[3] => stdClass Object
(
[id] => 70
[name] => Aussie Tree Services
[state] => NSW
[classid] => 11
)
[4] => stdClass Object
(
[id] => 75
[name] => B C Sands
[state] => NSW
[classid] => 11
)
[5] => stdClass Object
(
[id] => 76
[name] => B C Sands
[state] => NSW
[classid] => 11
)
[6] => stdClass Object
(
[id] => 77
[name] => B C Sands Mascot
[state] => NSW
[classid] => 11
)
[7] => stdClass Object
(
[id] => 113
[name] => Barbeques Galore (Maitland)
[state] => NSW
[classid] => 1
)
[8] => stdClass Object
(
[id] => 114
[name] => Barbeques Galore Batemans Bay
[state] => NSW
[classid] => 1
)
[9] => stdClass Object
(
[id] => 116
[name] => Barbeques Galore Wagga Wagga
[state] => NSW
[classid] => 1
)
[10] => stdClass Object
(
[id] => 131
[name] => Best Burning Fire Fuels
[state] => NSW
[classid] => 11
)
[11] => stdClass Object
(
[id] => 132
[name] => Betta Burn Firewood
[state] => NSW
[classid] => 11
)
[12] => stdClass Object
(
[id] => 136
[name] => Black Forest Firewood
[state] => NSW
[classid] => 11
)
[13] => stdClass Object
(
[id] => 181
[name] => Central Coast Brick Supplies Pty Ltd
[state] => NSW
[classid] => 1
)
[14] => stdClass Object
(
[id] => 188
[name] => Cheminee Pty Ltd
[state] => NSW
[classid] => 1
)
[15] => stdClass Object
(
[id] => 249
[name] => Embers Heating & Restoration Supplies
[state] => NSW
[classid] => 1
)
[16] => stdClass Object
(
[id] => 250
[name] => Emmbers Firewood Supplies
[state] => NSW
[classid] => 11
)
[17] => stdClass Object
(
[id] => 292
[name] => Goulburn Sand & Soil
[state] => NSW
[classid] => 11
)
[18] => stdClass Object
(
[id] => 304
[name] => Gunida Gunyah Aboriginal Corporation
[state] => NSW
[classid] => 11
)
[19] => stdClass Object
(
[id] => 334
[name] => J Perram Firewood Supplies
[state] => NSW
[classid] => 11
)
[20] => stdClass Object
(
[id] => 346
[name] => Jetmaster (Aust) Pty Ltd
[state] => NSW
[classid] => 1
)
[21] => stdClass Object
(
[id] => 402
[name] => Mark H Newton
[state] => NSW
[classid] => 4
)
[22] => stdClass Object
(
[id] => 416
[name] => Might Burn Red Gum Pty Ltd
[state] => NSW
[classid] => 11
)
[23] => stdClass Object
(
[id] => 430
[name] => Mr Stoves Pool World
[state] => NSW
[classid] => 1
)
[24] => stdClass Object
(
[id] => 455
[name] => O'Brien's Redgum Sawmills
[state] => NSW
[classid] => 11
)
[25] => stdClass Object
(
[id] => 477
[name] => PJ & CM Ducat
[state] => NSW
[classid] => 11
)
[26] => stdClass Object
(
[id] => 483
[name] => Quality Firewood All Seasons
[state] => NSW
[classid] => 11
)
[27] => stdClass Object
(
[id] => 487
[name] => R J & M E Grealy
[state] => NSW
[classid] => 11
)
[28] => stdClass Object
(
[id] => 494
[name] => RN & CA Taylor
[state] => NSW
[classid] => 11
)
[29] => stdClass Object
(
[id] => 500
[name] => Rouse Hill Firewood
[state] => NSW
[classid] => 11
)
[30] => stdClass Object
(
[id] => 504
[name] => Sapphire Coast Firewood
[state] => NSW
[classid] => 11
)
[31] => stdClass Object
(
[id] => 534
[name] => Sydney Heaters Pty Ltd
[state] => NSW
[classid] => 1
)
[32] => stdClass Object
(
[id] => 551
[name] => The Woodyard
[state] => NSW
[classid] => 11
)
[33] => stdClass Object
(
[id] => 576
[name] => W R Campi
[state] => NSW
[classid] => 11
)
[34] => stdClass Object
(
[id] => 602
[name] => Wood 4 U
[state] => NSW
[classid] => 11
)
[35] => stdClass Object
(
[id] => 603
[name] => Wood Galore
[state] => NSW
[classid] => 11
)
[36] => stdClass Object
(
[id] => 604
[name] => Wood Galore
[state] => NSW
[classid] => 11
)
)
[QLD] => Array
(
[0] => stdClass Object
(
[id] => 665
[name] => Brightspark Firewood Supplies
[state] => QLD
[classid] => 11
)
[1] => stdClass Object
(
[id] => 702
[name] => Gleno's Firewood
[state] => QLD
[classid] => 11
)
[2] => stdClass Object
(
[id] => 704
[name] => Gold Coast Fireplace & Barbeque Centre
[state] => QLD
[classid] => 1
)
[3] => stdClass Object
(
[id] => 732
[name] => Longburn Wood
[state] => QLD
[classid] => 11
)
[4] => stdClass Object
(
[id] => 742
[name] => Out In The Styx
[state] => QLD
[classid] => 11
)
[5] => stdClass Object
(
[id] => 746
[name] => Quickfire Firewood
[state] => QLD
[classid] => 11
)
)
[SA] => Array
(
[0] => stdClass Object
(
[id] => 786
[name] => Adelaide Wholesale Landscape Supplies
[state] => SA
[classid] => 11
)
[1] => stdClass Object
(
[id] => 825
[name] => Clare Wood Yard
[state] => SA
[classid] => 11
)
[2] => stdClass Object
(
[id] => 826
[name] => Clewers Electrical and Furniture
[state] => SA
[classid] => 1
)
[3] => stdClass Object
(
[id] => 832
[name] => Cullen Transport & Firewood Supplies
[state] => SA
[classid] => 11
)
[4] => stdClass Object
(
[id] => 852
[name] => Enviro Systems Renewable Resources Ltd.
[state] => SA
[classid] => 11
)
[5] => stdClass Object
(
[id] => 867
[name] => Gawler Landscaping Supplies
[state] => SA
[classid] => 11
)
[6] => stdClass Object
(
[id] => 871
[name] => Green Hornet Building & Landscape Supplies
[state] => SA
[classid] => 11
)
[7] => stdClass Object
(
[id] => 899
[name] => Mexican Living
[state] => SA
[classid] => 1
)
[8] => stdClass Object
(
[id] => 903
[name] => Mount Barker Landscape Centre
[state] => SA
[classid] => 11
)
[9] => stdClass Object
(
[id] => 911
[name] => Pecan Engineering Pty Ltd
[state] => SA
[classid] => 1
)
[10] => stdClass Object
(
[id] => 919
[name] => PW & JD Plunkett
[state] => SA
[classid] => 11
)
[11] => stdClass Object
(
[id] => 922
[name] => Renmark Firewoods & Storage Services
[state] => SA
[classid] => 11
)
[12] => stdClass Object
(
[id] => 930
[name] => South Coast Firewood (FWS Inc)
[state] => SA
[classid] => 11
)
[13] => stdClass Object
(
[id] => 937
[name] => Tinpak Trading Pty Ltd
[state] => SA
[classid] => 11
)
[14] => stdClass Object
(
[id] => 940
[name] => Traeger's Earthmoving & Transport
[state] => SA
[classid] => 11
)
[15] => stdClass Object
(
[id] => 947
[name] => Waterways Farm
[state] => SA
[classid] => 11
)
)
[TAS] => Array
(
[0] => stdClass Object
(
[id] => 985
[name] => Eastern Tiers Firewood
[state] => TAS
[classid] => 11
)
[1] => stdClass Object
(
[id] => 998
[name] => Goods Water & Garden Supplies
[state] => TAS
[classid] => 11
)
[2] => stdClass Object
(
[id] => 1011
[name] => K-Mac Wood Supplies
[state] => TAS
[classid] => 11
)
[3] => stdClass Object
(
[id] => 1019
[name] => Leslie Vale Landscape & Gravel Supplies
[state] => TAS
[classid] => 11
)
[4] => stdClass Object
(
[id] => 1023
[name] => Newmans Heating Shop
[state] => TAS
[classid] => 1
)
[5] => stdClass Object
(
[id] => 1029
[name] => Pellet Fires Tasmania
[state] => TAS
[classid] => 1
)
)
[VIC] => Array
(
[0] => stdClass Object
(
[id] => 561
[name] => TRT Pastoral Group
[state] => VIC
[classid] => 11
)
[1] => stdClass Object
(
[id] => 1059
[name] => A Grade Garden Products
[state] => VIC
[classid] => 11
)
[2] => stdClass Object
(
[id] => 1062
[name] => A.F. Gason Pty Ltd
[state] => VIC
[classid] => 1
)
[3] => stdClass Object
(
[id] => 1088
[name] => Alpine Timber
[state] => VIC
[classid] => 11
)
[4] => stdClass Object
(
[id] => 1093
[name] => Aranbe Heat
[state] => VIC
[classid] => 1
)
[5] => stdClass Object
(
[id] => 1096
[name] => ASAP Firewood
[state] => VIC
[classid] => 11
)
[6] => stdClass Object
(
[id] => 1105
[name] => Bairnsdale Stoves Heaters & BBQ's
[state] => VIC
[classid] => 1
)
[7] => stdClass Object
(
[id] => 1176
[name] => Burra Garden Supplies
[state] => VIC
[classid] => 11
)
[8] => stdClass Object
(
[id] => 1231
[name] => Daryl Fagan Firewood
[state] => VIC
[classid] => 11
)
[9] => stdClass Object
(
[id] => 1273
[name] => Firefox Industries Pty Ltd
[state] => VIC
[classid] => 1
)
[10] => stdClass Object
(
[id] => 1297
[name] => Geoffrey R Gelletly
[state] => VIC
[classid] => 4
)
[11] => stdClass Object
(
[id] => 1301
[name] => Gippsland Wood Heater Repairs
[state] => VIC
[classid] => 1
)
[12] => stdClass Object
(
[id] => 1303
[name] => Glen Dimplex Australia Pty Ltd
[state] => VIC
[classid] => 1
)
[13] => stdClass Object
(
[id] => 1306
[name] => Glowin' Firewood
[state] => VIC
[classid] => 11
)
[14] => stdClass Object
(
[id] => 1328
[name] => HRL Technology Pty Ltd
[state] => VIC
[classid] => 1
)
[15] => stdClass Object
(
[id] => 1415
[name] => Moran Logging Co Pty Ltd
[state] => VIC
[classid] => 11
)
[16] => stdClass Object
(
[id] => 1427
[name] => Murray Industries Kerang
[state] => VIC
[classid] => 11
)
[17] => stdClass Object
(
[id] => 1428
[name] => Murray Industries Swan Hill
[state] => VIC
[classid] => 4
)
[18] => stdClass Object
(
[id] => 1436
[name] => North East Fwd Strategy Implementn Comm
[state] => VIC
[classid] => 1
)
[19] => stdClass Object
(
[id] => 1438
[name] => Northern Landscape Supplies
[state] => VIC
[classid] => 11
)
[20] => stdClass Object
(
[id] => 1448
[name] => Park Orchards Garden & Building Supplies
[state] => VIC
[classid] => 11
)
[21] => stdClass Object
(
[id] => 1476
[name] => Redgumdave
[state] => VIC
[classid] => 11
)
[22] => stdClass Object
(
[id] => 1493
[name] => Sand, Soil & Rocks Pty Ltd
[state] => VIC
[classid] => 11
)
[23] => stdClass Object
(
[id] => 1495
[name] => Shamic Sheetmetal Aust Pty Ltd
[state] => VIC
[classid] => 1
)
[24] => stdClass Object
(
[id] => 1516
[name] => Surrey Hills Firewood Supplies
[state] => VIC
[classid] => 11
)
[25] => stdClass Object
(
[id] => 1529
[name] => The Flue Factory Pty Ltd
[state] => VIC
[classid] => 1
)
[26] => stdClass Object
(
[id] => 1553
[name] => Trevor King
[state] => VIC
[classid] => 11
)
[27] => stdClass Object
(
[id] => 1585
[name] => Whitlands Engineering
[state] => VIC
[classid] => 1
)
[28] => stdClass Object
(
[id] => 1591
[name] => Wignells of Melbourne Pty Ltd
[state] => VIC
[classid] => 1
)
[29] => stdClass Object
(
[id] => 1604
[name] => WWF Australia
[state] => VIC
[classid] => 1
)
[30] => stdClass Object
(
[id] => 1609
[name] => Yarra Timber Salvage
[state] => VIC
[classid] => 11
)
)
[WA] => Array
(
[0] => stdClass Object
(
[id] => 1623
[name] => All Suburbs Garden & Wood Supply
[state] => WA
[classid] => 11
)
[1] => stdClass Object
(
[id] => 1628
[name] => Barbecue Bazaar Cannington
[state] => WA
[classid] => 1
)
[2] => stdClass Object
(
[id] => 1672
[name] => European Wood Fired Ovens
[state] => WA
[classid] => 1
)
[3] => stdClass Object
(
[id] => 1681
[name] => Freo Firewood Supply
[state] => WA
[classid] => 11
)
[4] => stdClass Object
(
[id] => 1740
[name] => Roleystone Firewood
[state] => WA
[classid] => 11
)
[5] => stdClass Object
(
[id] => 1747
[name] => Smart Burn Pty Ltd
[state] => WA
[classid] => 1
)
[6] => stdClass Object
(
[id] => 1748
[name] => Specialised Tree Service
[state] => WA
[classid] => 11
)
[7] => stdClass Object
(
[id] => 1855
[name] => York Firewood & Milling
[state] => WA
[classid] => 11
)
)
)

Answer 1

usort($array, function($a, $b) {
return count($a) - count($b);
});
Assuming >= PHP 5.3

Answer 2

After running this, $arr will now be sorted from highest populated elements to lower.
function cmpArray($a, $b)
{
$countA = count($a);
$countB = count($b);
if ($countA == $countB) {
return 0;
}
return ($countA < $countB) ? 1 : -1;
}
uasort($arr, "cmpArray");

Answer 3

Similar to #alex's answer, but without the anonymous function (so it works on PHP <5.3)
<?php
$array = array(
'three' => array(
'one',
'two',
'three'
),
'one' => array(
'one'
),
'two' => array(
'one',
'two'
),
);
function csort($a, $b) {
return count($a) - count($b);
}
uasort($array, 'csort');
print_r($array);
?>
Output:
Array
(
[one] => Array
(
[0] => one
)
[two] => Array
(
[0] => one
[1] => two
)
[three] => Array
(
[0] => one
[1] => two
[2] => three
)
)