PHP Convert RGB Array to String variable

Question

I am converting a Hexcode into RGB and when I echo this is outputs correctly EG, 55,55,55 . I am wanting to assign this RGB Value to a variable called RGBColour but it is just assigning the wordd 'array' to the variable. Can someone please give me a pointer as to what I am doing wrong.

$hexcolour = $_POST['hexcolour'];
$RGBcolour = list($r, $g, $b) = sscanf($charitycolour1, "#%02x%02x%02x"));

Sounds like $RGBcolour is an array. Try var_dump($RBGcolour); to see what it contains. — aynber
– aynber, Commented Jan 14, 2020 at 13:35
If it outputs a "55, 55, 55" string, you should use the split method like so: $RGBcolor = list($r, $g, $b) = split(",", "55,55,55"). — Cadu De Castro Alves
– Cadu De Castro Alves, Commented Jan 14, 2020 at 13:40
The given code does not define the variable $charitycolour1 after all. What have you tried to spot the problem in your real code? — Nico Haase
– Nico Haase, Commented Jan 14, 2020 at 16:06

jeprubio · Accepted Answer · 2020-01-14 16:24:37Z

2

RGBcolour is an array as the var_dump shows, but then you can get the rgb color again with a sprintf:

$charitycolour1 = '#ff3300';
$RGBcolour = list($r, $g, $b) = sscanf($charitycolour1, "#%02x%02x%02x");
var_dump($RGBcolour);


$RGBcolour = sprintf("#%02x%02x%02x", $r, $g, $b);
echo 'RGBcolour: '.$RGBcolour;

outputs

array(3) {
  [0]=>
  int(255)
  [1]=>
  int(51)
  [2]=>
  int(0)
}
RGBcolour: #ff3300

If you want the RGB as 255,51,0 you can use join:

$charitycolour1 = '#ff3300';
$RGBarray = sscanf($charitycolour1, "#%02x%02x%02x");
$RGBcolour = join(',', $RGBarray);
echo 'RGBcolour: '.$RGBcolour;

This outputs: RGBcolour: 255,51,0

And if later on you want the hexa value again from that 255,51,0 value:

$RGBcolour = '255,51,0';
$RGBarray = explode(',', $RGBcolour);
$hexaColour = sprintf("#%02x%02x%02x", $RGBarray[0], $RGBarray[1], $RGBarray[2]);
echo 'Hexa Colour: '.$hexaColour;

that outputs: Hexa Colour: #ff3300

edited Jan 14, 2020 at 16:24

answered Jan 14, 2020 at 13:55

jeprubio

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9 Comments

James Harding Over a year ago

Thank you. I have tried the below but it just sets the Hex code as the value of $RGBcolour and not the R,G,B, value. Any ideas?

James Harding Over a year ago

Thanks so if the hex code was #ff3300 I was to be able to set $RGBcolour to 255,51,0 for its RGB value.

James Harding Over a year ago

Perfect, thank you. If I want to post this value to a db, can I do so just referencing $RGBcolour ?

jeprubio Over a year ago

Exactly, now it's a string. Well, but keep in mind that when you work in a db it's a good practice to use prepared statements to prevent from SQL injection attacks. Don't just concatenate strings.

jeprubio Over a year ago

By the way, if you then restore that value from a database you'll need to split it (the oposite of the join to get the array again from the string) and then use the sprintf expression I used before to get it's original value in hexa

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