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Thread: Color Picker with Hex to RGB

  1. #1
    Join Date
    May 2014

    Color Picker with Hex to RGB

    I am using the jscolor color picker then needing to convert the hex to RBG to output this via the FPDF library.

    I am trying to use this script to convert the color
    function hex2rgb($hex) {
       $hex = str_replace("#", "", $hex);
       if(strlen($hex) == 3) {
          $r = hexdec(substr($hex,0,1).substr($hex,0,1));
          $g = hexdec(substr($hex,1,1).substr($hex,1,1));
          $b = hexdec(substr($hex,2,1).substr($hex,2,1));
       } else {
          $r = hexdec(substr($hex,0,2));
          $g = hexdec(substr($hex,2,2));
          $b = hexdec(substr($hex,4,2));
       $rgb = array($r, $g, $b);
       //return implode(",", $rgb); // returns the rgb values separated by commas
       return $rgb; // returns an array with the rgb values

    This is my line for collecting the hex(same page as function)
    $color = $_POST["value"];

    and this is my html
    HTML Code:
    <form action="text-color.php" name="genForm" method="post">
     Color of Text <input class="color" value="000000">
    		<br />
    <input type="submit" value="Get Color" style="height: 40px; width: 180px; font-size: 17px;" />

    Since FPDF can only output RGB I need to be able change this
    SetTextColor(int r [, int g, int b]) via the function, but can't get it to work.

    The PHP/PDF pages are set up correctly, as I am already outputting other information. This is the only part I can't get to work.


  2. #2
    Join Date
    Aug 2004
    So...how/where are you using the function? Looks like you would supply it the hex-code string you get from the form, and it will return an array of 3 values.

    However, looking at your HTML form, you don't have a name attribute for the field, so maybe that's your problem?
    HTML Code:
    <input name="color" class="color" value="000000">
    Then you should be able to do something like:
    PHP Code:
    $colors hex2rgb($_POST['color']);

    some_magical_pdf_function($colors[0], $colors[1], $colors[2]); 
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