Array sort by First Value

Question

This is my current Array

Array
(
    [0] => [10,13],
    [1] => [11,15],
    [2] => [12,7],
    [3] => [1,0],
    [4] => [2,0],
    [5] => [3,0],
    [6] => [4,0],
    [7] => [5,0],
    [8] => [6,0],
    [9] => [7,0],
    [10] => [8,0],
    [11] => [9,0]
);

I want to sort this array by the value(value before comma).
Result should be like this:

Array
(    
    [1] => [1,0],
    [2] => [2,0],
    [3] => [3,0],
    [4] => [4,0],
    [5] => [5,0],
    [6] => [6,0],
    [7] => [7,0],
    [8] => [8,0],
    [9] => [9,0],
    [10] => [10,13],
    [11] => [11,15],
    [12] => [12,7]
);

Is it possible in PHP ?

Answer 1

OPTION 1 : IF TWO DIMENSIONAL ARRAY TRY THIS ONE

$data = array();
$data[0] = array(10, 13);
$data[2] = array(11, 15);
$data[3] = array(12, 7);
$data[4] = array(1, 0);
$data[5] = array(2, 0);
$data[6] = array(3, 0);
$data[7] = array(4, 0);
$data[8] = array(5, 0);
$data[9] = array(6, 0);
$data[10] = array(7, 0);
$data[11] = array(8, 0);
$data[12] = array(9, 0);


echo "<pre>";
//print_r($data);
array_multisort($data);
print_r($data);
echo "</pre>";
?>

OUTPUT

Array
(
[0] => Array
    (
        [0] => 1
        [1] => 0
    )

[1] => Array
    (
        [0] => 2
        [1] => 0
    )

[2] => Array
    (
        [0] => 3
        [1] => 0
    )

[3] => Array
    (
        [0] => 4
        [1] => 0
    )

[4] => Array
    (
        [0] => 5
        [1] => 0
    )

[5] => Array
    (
        [0] => 6
        [1] => 0
    )

[6] => Array
    (
        [0] => 7
        [1] => 0
    )

[7] => Array
    (
        [0] => 8
        [1] => 0
    )

[8] => Array
    (
        [0] => 9
        [1] => 0
    )

[9] => Array
    (
        [0] => 10
        [1] => 13
    )

[10] => Array
    (
        [0] => 11
        [1] => 15
    )

[11] => Array
    (
        [0] => 12
        [1] => 7
    )
)

OPTION 2 : IF ONE DIMENSIONAL ARRAY TRY THIS ONE

$data = array();
$data[0] = "10,13";
$data[2] = "11,15";
$data[3] = "12,7";
$data[4] = "1,0";
$data[5] = "2,0";
$data[6] = "3,0";
$data[7] = "4,0";
$data[8] = "5,0";
$data[9] = "6,0";
$data[10] = "7,0";
$data[11] = "8,0";
$data[12] = "9,0";

echo "<pre>";
//print_r($data);
echo "</pre>";

function dataSort($data){
    $data_temp =array();
    foreach($data as $item){
        $data_temp[] = explode(",",$item);
    }
    array_multisort($data_temp);

    $data =array();
    foreach($data_temp as $item){
        $data[] = $item[0].",".$item[1];
    }
    return $data;
}
$data  = dataSort($data); 
print_r($data);

OUTPUT

Array
(
   [0] => 1,0
   [1] => 2,0
   [2] => 3,0
   [3] => 4,0
   [4] => 5,0
   [5] => 6,0
   [6] => 7,0
   [7] => 8,0
   [8] => 9,0
   [9] => 10,13
   [10] => 11,15
   [11] => 12,7
)

Answer 2

you need to use usort function :

$a = array([10,13],[11,15],[12,7],[1,0],[2,0],[3,0],[4,0],[5,0],[6,0],[7,0],[8,0],[9,0]);
print_r($a);
usort($a, "cmp");
print_r($a);
?>

See Example Here : http://ideone.com/gv4k70

Answer 3

This is What you want DEMO

 <?php


$yourArray = array(
    1 => array(
        10,
        13
    ),
    2 => array(
        11,
        15
    ),
    3 => array(
        12,
        7
    ),
    4 => array(
        1,
        0
    ),
    5 => array(
        2,
        0
    ),
    6 => array(
        3,
        0
    ),
    7 => array(
        4,
        0
    ),
    8 => array(
        5,
        0
    ),
    9 => array(
        6,
        0
    ),
    10 => array(
        7,
        0
    ),
    11 => array(
        8,
        0
    ),
    12 => array(
        9,
        0
    )
);

$array = array();

foreach ($yourArray as $key => $row) {
    $array[$key] = $yourArray['value'];
}
array_multisort($array, SORT_DESC, $yourArray);

$yourArray = array_combine(range(1, count($yourArray)), array_values($yourArray));

print_r($yourArray);

?> 

Answer 4

Since the values you are dealing with are strings (per your response to my comment) you need to isolate the first numerical value, then sort based on that. (Please note this does not support multiples of the same "first number").

Example:

$a = array("[1,10]", "[2,19]", "[6,13]", "[2,15]", "[4,16]");

$sortable = array();

foreach($a as $subject) {
    $start = strpos($subject, "[");
    $end = strpos($subject, ",");
    $ndx = substr($subject, $start, $end - $start);
    $sortable[$ndx] = $subject;
}

ksort($sortable);

var_dump($sortable);

var_dump will produce:

array(4) {
  ["[1"]=>
  string(6) "[1,10]"
  ["[2"]=>
  string(6) "[2,15]"
  ["[4"]=>
  string(6) "[4,16]"
  ["[6"]=>
  string(6) "[6,13]"
}

Answer 5

You may use usort() function or any of this list, what's near to you. For example:

<?php

$array = array (
    array(10,13),
    array(11,15),
    array(12,7),
    array(1,0),
    array(2,0),
    array(3,0),
    array(4,0),
    array(5,0),
    array(6,0),
    array(7,0),
    array(8,0),
    array(9,0)
);

function mySort( $l, $r ) {
   return (( $l[0] == $r[0] ) ? 0 : ($l[0] > $r[0] ? 1 : -1) );
}

usort( $array, 'mySort' );

print_r( $array );

?>

demo

Answer 6

Try this

function mSort($a,$b) {
    if ($a[0] == $b[0]) {
        return 0;
    }
    return ($a[0] < $b[0]) ? -1 : 1;
}

usort($arr, "mSort");

print_r($arr);

Answer 7

You can use array_multisort() function for this

$arr = array([10,13],[11,15],[12,7],[1,0],[2,0],[3,0],[4,0],[5,0],[6,0],[7,0],[8,0],[9,0]);

        array_multisort($arr);
        var_dump($arr);exit;

Answer 8

You need to access $value as a reference to the entry in $array:

private function orderByKey(&$array) {
    ksort($array);
    foreach($array as &$value) {
        if (is_array($value)) {
            $this->orderByKey($value);
        }
    }
}

Answer 9

You can try

$new = array();
foreach($first_array as $key => $value) {
     $new[$key] = $value;
 }
array_multisort($new, SORT_ASC, $first_array);