PDF_setcolor()

(PHP 4 >= 4.0.5, PECL pdflib >= 1.0.0)

Set fill and stroke color

说明

PDF_setcolor (resource $p,string $fstype,string $colorspace,float $c1,float $c2,float $c3,float $c4) : bool

Sets the current color space and color. 成功时返回 TRUE， 或者在失败时返回 FALSE。

If you encounter errors of the form function 'PDF_setcolor' must not be called in 'path' scope this generally means that you've called the PDFLib functions in the wrong order. For example, the following would be *incorrect* because PDF_rect marks the beginning of the "path scope", and set_color must not be called in path scope:
<?php
// THIS CODE WILL PRODUCE AN ERROR
PDF_rect($pdf,0,0,$width,$height);
PDF_setcolor($pdf,$red,$green,$blue);
PDF_fill($pdf);
<p>The correct order of function calls is as follows:
<p>// Correct order of function calls
PDF_setcolor($pdf,$red,$green,$blue);
PDF_rect($pdf,0,0,$width,$height);
PDF_fill($pdf);
?>

Here is a quick snippet to convert CMYK to RGB. It has better precision than a lot of other solutions that also don't factor in colour profiles.
<?php
$cmyk = '10,20,100,31';
list($c, $m, $y, $k) = explode(',', $cmyk);
# Gets the rgb as floats (cast via (int) if you want int )
$r = (1 - min(($c / 100) * (1 - $k /= 100) + 1 * $k, 1)) * 255;
$g = (1 - min(($m / 100) * (1 - $k) + 1 * $k, 1)) * 255;
$b = (1 - min(($y / 100) * (1 - $k) + 1 * $k, 1)) * 255;
echo "$r $g $b\r\n";
# Converts the rgb to hex with leading 0's
$r = str_pad(dechex($r), 2, '0', STR_PAD_LEFT);
$g = str_pad(dechex($g), 2, '0', STR_PAD_LEFT);
$b = str_pad(dechex($b), 2, '0', STR_PAD_LEFT);
echo "hex: $r$g$b\r\n";
/* an example to see the colour via html
echo '<div style="width: 80px; height: 80px; background-color:#', "$r$g$b", '"></div>';
*/
?>

Damn, this took me some real long time! Maybe it's helpfull for those who even have no idea of color-Schemes like me ;)
If u want to generate PDF's for Print Offices u need to set all the colors in CMYK.
Here is a Function that will convert RGB to CMYK
<?
function hex2rgb($hex) {
 $color = str_replace('#','',$hex);
 $rgb = array('r' => hexdec(substr($color,0,2)),
        'g' => hexdec(substr($color,2,2)),
        'b' => hexdec(substr($color,4,2)));
 return $rgb;
}
function rgb2cmyk($var1,$g=0,$b=0) {
  if(is_array($var1)) {
   $r = $var1['r'];
   $g = $var1['g'];
   $b = $var1['b'];
  }
  else $r=$var1;
  $cyan  = 255 - $r;
  $magenta = 255 - $g;
  $yellow = 255 - $b;
  $black  = min($cyan, $magenta, $yellow);
  $cyan  = @(($cyan  - $black) / (255 - $black)) * 255;
  $magenta = @(($magenta - $black) / (255 - $black)) * 255;
  $yellow = @(($yellow - $black) / (255 - $black)) * 255;
  return array('c' => $cyan / 255,
        'm' => $magenta / 255,
        'y' => $yellow / 255,
        'k' => $black / 255);
}
$color=rgb2cmyk(hex2rgb('#FF0000')); 
pdf_setcolor($pdf, "both", "cmyk", $color['c'], $color['m'], $color['y'], $color['k']);
?>
U can call it with parameters (r,g,b) or just an array(r,g,b) that contains these values.
Hope it works correct. All testing was fine.

This seems a little less complicated:
this is the color you want to use : 'FF11AA'
<?php
pdf_setcolor ($pdf, 'both', 0xFF / 255, 0x11 / 255, 0xAA / 255);
?>

Here's a better implementation for setting HTML hexadecimal colors:
function pdf_setcolor_hex($hexcolor, $type = '')
{
  global $pdf;   ## match this to your pdf resource handle
    $color['r'] = hexdec(substr($hexcolor, 0, 2))/255; 
    $color['g'] = hexdec(substr($hexcolor, 2, 2))/255; 
    $color['b'] = hexdec(substr($hexcolor, 4, 2))/255;
    if ($type != 'fill' && $type != 'stroke') $type = 'both';
    pdf_setcolor($pdf, $type, 'rgb', $color['r'], $color['g'], $color['b']);
}
Sample usage:
pdf_setcolor_hex('FFFFFF', 'fill');
-Derek

Here's a function for converting HTML hexadecimal colors to RGB decimals suitable for this function:
$color_hex = "FF0000";    ## whatever hex color you want
$color = convert_hexcolor_rgbdec($color_hex);
pdf_setcolor($pdf, 'fill', 'rgb', $color['r'], $color['g'], $color['b']);
function convert_hexcolor_rgbdec($color_hex)
{
  $color['r'] = hexdec(substr($color_hex, 0, 2))/255; 
  $color['g'] = hexdec(substr($color_hex, 2, 2))/255; 
  $color['b'] = hexdec(substr($color_hex, 4, 2))/255;
  return $color;
}
-Derek

Bonjour,
Cette fonction est utilisable pour dfinir une couleur de police.
Hello,
I search for the way of setting colors for the font in pdf and I find this.
Hope it could help.
<?php
/**
*  set font color
*  maurice.anglebert@free.fr
*/
// path for the pdf file and string to show
$pdfFilePath = $_SERVER[DOCUMENT_ROOT]."/the_dir_of_the_file/test.pdf";
$string = "The new color of my font";
$pdf = pdf_new();
pdf_open_file($pdf, $pdfFilePath);
pdf_set_info($pdf, "Title", "Test pdf");
// A4 page
pdf_begin_page($pdf, 595, 842);
// set up of the font
$font = pdf_findfont($pdf, "Courier", "host", FALSE); 
  if (isset($font)) { 
    pdf_setfont($pdf, $font, 10) or die ("unknown font"); 
  } 
pdf_setColor($pdf, "fill", "rgb",0, 0, 1); 
// this for blue color 
// pdf_setColor($pdf, "fill", "rgb",1, 0, 0) for red
pdf_set_value($pdf, "textrendering", 0);
// show at the top of the page center
pdf_show_boxed($pdf, $string, 0, 832, 595, 10, "center", "");
// resets graphic state
pdf_initGraphics($pdf);
// end of page and pdf_object 
pdf_end_page($pdf); 
pdf_close($pdf);
pdf_delete($pdf);
// use header to get the file
header("Content-type: application/pdf");
header("Content-length: ".filesize($pdfFilePath));
header("Content-disposition: inline; filename=test.pdf");
readfile($pdfFilePath);  
?>

If you want to change the font color you need to set type to "fill", not "stroke" ("both" also works, of course).