Generate random hexadecimal colour in Twig - symfony

Question

I want to generate random hex colors in Twig, to use it for example as a background in something like this:
{% for organization in organizations %}
{
value: {{ organization.value }},
color: "#F56954",
label: "{{ organization.name }}"
},
{% endfor %}
Any way to do it?

Answer 1

I suggest you to randomise a know set of data (in order to exclude no sense values) as follow:
{% for organization in organizations %}
{
value: {{ organization.value }},
color: "{{ random(['#H54924', '#F36252', '#F56954']) }}"
label: "{{ organization.name }}"
},
{% endfor %}
EDIT:
For pure random values, you can try the following approach:
{% set values = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f']%}
{% for organization in organizations %}
{
value: {{ organization.value }},
color: "#{{random(values)~ random(values)~ random(values)~ random(values)~ random(values)~ random(values) }}",
label: "{{ organization.name }}"
},
{% endfor %}
{{ '#' ~ random(values) ~ random(values) ~ random(values) ~ random(values) ~ random(values) ~ random(values) }}
Here a working example
Hope this help

Answer 2

class SomeUtil
{
/**
* #return string hex color string (RGB): #XXXXXX
*/
public static function randHexColor()
{
return sprintf("#%06s", dechex(rand(0, 256**3-1)));
}
/**
* #param int $rangeFrom [0..255]
* #param int $rangeTo [0..255]
* #return string hex color string (RGB): #XXXXXX
*/
public static function rangedRandHexColor($rangeFrom = null, $rangeTo = null)
{
$min = 0;
$max = 255;
if ($rangeFrom === null || !NumberUtil::inRange($rangeFrom, $min, $max)) {
$rangeFrom = $min;
}
if ($rangeTo === null || !NumberUtil::inRange($rangeTo, $min, $max)) {
$rangeTo = $max;
}
if ($rangeFrom === $min && $rangeTo === $max) {
return self::randHexColor();
} else {
return sprintf("#%02s", dechex(rand($rangeFrom, $rangeTo)))
.sprintf("%02s", dechex(rand($rangeFrom, $rangeTo)))
.sprintf("%02s", dechex(rand($rangeFrom, $rangeTo)));
}
}
}
In controller
$data['util'] = new SomeUtil();
return $this->renderView('AppBundle:Foo:bar.html.twig', $data);
In twig
{{ util.randHexColor() }}
or
{{ util.rangedRandHexColor(180, 220) }}
to exclude dark and LSD colors