Question

How to convert from RGB to HEX with PHP

Answer 1

function RGBtoHEX(int $r, int $g, int $b) {   
    return dechex( (($r & 0xff) << 16) + (($g & 0xff) << 8) + ($b & 0xff) );
}
 
$r = 80;
$g = 125;
$b = 210;
      
echo RGBtoHEX($r, $g, $b);
  
 
  
/*
run:
  
507dd2
  
*/

 

70+ SQL courses for beginners and professionals

Answer 2

$r = 80;
$g = 125;
$b = 210;
      
echo sprintf("0x%02X%02X%02X", $r, $g, $b);

  
/*
run:
  
0x507DD2
  
*/

 

70+ SQL courses for beginners and professionals

Answer 3

function rgb2hex($rgb) {
   $hex = "0x";
   $hex .= str_pad(dechex($rgb[0]), 2, "0", STR_PAD_LEFT);
   $hex .= str_pad(dechex($rgb[1]), 2, "0", STR_PAD_LEFT);
   $hex .= str_pad(dechex($rgb[2]), 2, "0", STR_PAD_LEFT);
 
   return $hex; 
}
 
$hex = rgb2hex(array( 0, 255, 0 ));

echo $hex;

  
/*
run:
  
0x00ff00
  
*/

 

70+ SQL courses for beginners and professionals