PHP: Associative array to numeric array

Question

I have the following problem:

I have a 2-dimentional array containing some data, the first index contains the "year" and in the second has a range with values on it.

Here's an example of how a regular data is parsed though print_r().

Array
(
    [2017] => Array
        (
            [0] => 215
            [1] => 182
            [2] => 149
            [3] => 159
            [4] => 176
            [5] => 151
            [6] => 221
            [7] => 185
            [8] => 178
            [9] => 191
            [10] => 265
            [11] => 304
        )

    [2016] => Array
        (
            [0] => 162
            [1] => 179
            [2] => 162
            [3] => 201
            [4] => 169
            [5] => 148
            [6] => 139
            [7] => 139
            [8] => 149
            [9] => 187
            [10] => 264
            [11] => 229
        )
}

It works well in this case. I'm using json_encode() from PHP and JSON.parse() to send the array to JavaScript.

However, there's a particular case that's not working well enough.

[2015] => Array
    (
        [1] => 4
        [6] => 88
        [7] => 119
        [8] => 117
        [9] => 107
        [10] => 151
        [11] => 218
    )

This array is being interpreted as a associative array, so JavaScript interprets as an Object datatype. My external library expect an array so it throws an error and the JavaScript execution halts.

When I try to fill the missing data in between with zeroes with this method

foreach($eM_value as $key => $value)
{
    for($x = 0;$x <= 11;$x++)
        $eM_value[$key][$x] = ((isset($eM_value[$key][$x])) ? intval($eM_value[$key][$x]) : 0);
}

It still is interpreted as an associative array.

[2015] => Array
    (
        [1] => 4
        [6] => 88
        [7] => 119
        [8] => 117
        [9] => 107
        [10] => 151
        [11] => 218
        [0] => 0
        [2] => 0
        [3] => 0
        [4] => 0
        [5] => 0
    )

How can I convert this specific entry to a numeric array?

If more information is needed please comment and I'll add it.

if you have "holes" in the numerical keys, it's far better to understand it as an object in JS, or else you'll have a bunch of undefined elements filling the holes. Arrays cannot have holes in JS. — Kaddath
– Kaddath, Commented Dec 11, 2018 at 14:07
create new array before json_encode. use array_values to get ranges without index gaps. foreach($array as $year => $ranges) { newArray[$year] = array_values($ranges)} And json_encode new array — Viktar Pryshchepa
– Viktar Pryshchepa, Commented Dec 11, 2018 at 14:11

Te Ko · Accepted Answer · 2018-12-11 14:22:25Z

2

You can use array_fill to prepare a placeholder array and then array_replace to put the real data in:

<?php

$input = [
    1 => 10,
    3 => 12,
    5 => 54
];

$output = array_replace(array_fill(0, 12, 0), $input);
print_r($output);

Will give you:

Array ( 
   [0] => 0 
   [1] => 10 
   [2] => 0 
   [3] => 12 
   [4] => 0 
   [5] => 54 
   [6] => 0 
   [7] => 0 
   [8] => 0 
   [9] => 0 
   [10] => 0 
   [11] => 0 
)

This way you can avoid sorting the keys.

answered Dec 11, 2018 at 14:22

Te Ko

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Comments

Shridhar Sharma · Accepted Answer · 2018-12-11 14:24:14Z

2

just use array_values function in PHP, it will output a numeric array of all the values

answered Dec 11, 2018 at 14:24

Shridhar Sharma

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