Replacing inner keys from multidimensional array in PHP - php

Question

Having the following array:
array(4) {
[0]=>
array(2) {
[0]=>
string(3) "233"
[1]=>
string(37) "some data"
}
[1]=>
array(2) {
[0]=>
string(3) "233"
[1]=>
string(68) "some other data"
}
[2]=>
array(2) {
[0]=>
string(3) "144"
[1]=>
string(38) "some other data"
}
[3]=>
array(2) {
[0]=>
string(3) "233"
[1]=>
string(42) "some other data"
}
}
I want to replace the values 233 and 144 (the key 0 from the inner array) by some random HEX color. The ones with the same keys (233) for example, has to have the same HEX color (FFF000 for example in the desired solution above).
This is the function I use to generate random HEX colors:
function randHEXcolor() {
return sprintf('%06X', mt_rand(0, 0xFFFFFF));
}
My desired output should be:
array(4) {
[0]=>
array(2) {
[0]=>
string(6) "FFF000"
[1]=>
string(37) "some data"
}
[1]=>
array(2) {
[0]=>
string(6) "FFF000"
[1]=>
string(68) "some other data"
}
[2]=>
array(2) {
[0]=>
string(6) "111333"
[1]=>
string(38) "some other data"
}
[3]=>
array(2) {
[0]=>
string(6) "FFF000"
[1]=>
string(42) "some other data"
}
}
How can I archieve this?
Thanks in advance.

Answer 1

foreach ($array as &$item) {
if (!isset($temp[$item[0]]) {
$temp[$item[0]] = randHEXcolor();
}
$item[0] = $temp[$item[0]];
}

Answer 2

If you want all values to be translated to the same random color, you'll have to save those colors:
$colors_translation = array();
foreach ($array as &$item) {
$color = $item[ 0 ];
$translate = $colors_translation[ $color ];
if (empty($translate)) {
$colors_translations[ $color ] = $translate = randHEXcolor();
}
$item[ 0 ] = $translate;
}

Answer 3

The solution using in_array and isset functions:
$keys = [];
foreach ($arr as &$v) { // $arr is your initial array
if (in_array($v[0], ['233', '144'])) {
if (!isset($keys[$v[0]])) $keys[$v[0]] = sprintf('%06X', mt_rand(0, 0xFFFFFF));
$v[0] = $keys[$v[0]];
}
}
print_r($arr);
The output:
Array
(
[0] => Array
(
[0] => 65A4BB
[1] => some data
)
[1] => Array
(
[0] => 65A4BB
[1] => some data
)
[2] => Array
(
[0] => DDB588
[1] => some data
)
[3] => Array
(
[0] => 65A4BB
[1] => some data
)
)

Answer 4

This code will create a color map as the array is traversed. Pre-populate $colorMap if you want pre-defined color translations.
<?php
$array = array(
0 => array(
0 => "233",
1 => "some data"
),
1 => array(
0 => "233",
1 => "some data"
),
2 => array(
0 => "144",
1 => "some data"
),
3 => array(
0 => "233",
1 => "some data"
),
);
$colorMap = array();
foreach ($array as &$inner) {
if (!array_key_exists($inner[0],$colorMap)) {
$newColor = randHEXcolor();
$colorMap[$inner[0]] = $newColor;
$inner[0] = $newColor;
} else {
$inner[0] = $colorMap[$inner[0]];
}
}
function randHEXcolor() {
return sprintf('%06X', mt_rand(0, 0xFFFFFF));
}
print_r($array);
print_r($colorMap);
Array
(
[0] => Array
(
[0] => F1519A
[1] => some data
)
[1] => Array
(
[0] => F1519A
[1] => some data
)
[2] => Array
(
[0] => 2F7D00
[1] => some data
)
[3] => Array
(
[0] => F1519A
[1] => some data
)
)
Array
(
[233] => F1519A
[144] => 2F7D00
)

Answer 5

Try:
<?php
$array = array(
0 => array(
0 => "233",
1 => "some data"
),
1 => array(
0 => "233",
1 => "some data"
),
2 => array(
0 => "144",
1 => "some data"
),
3 => array(
0 => "233",
1 => "some data"
),
);
function randHEXcolor() {
return sprintf('%06X', mt_rand(0, 0xFFFFFF));
}
$firstHex = randHEXcolor();
$secondHex = randHEXcolor();
foreach($array as $arrayIndex => &$arrayValue){
if($arrayValue[0] == "144"){
$arrayValue[0] = $firstHex;
}
if($arrayValue[0] == "233"){
$arrayValue[0] = $secondHex;
}
}
output:
array(4) {
[0]=>
array(2) {
[0]=>
string(6) "AB8248"
[1]=>
string(9) "some data"
}
[1]=>
array(2) {
[0]=>
string(6) "AB8248"
[1]=>
string(9) "some data"
}
[2]=>
array(2) {
[0]=>
string(6) "22AF8B"
[1]=>
string(9) "some data"
}
[3]=>
&array(2) {
[0]=>
string(6) "AB8248"
[1]=>
string(9) "some data"
}
}