Convert hex color to RGB values in PHP
PhpColorsHexRgbPhp Problem Overview
What would be a good way to convert hex color values like #ffffff into the single RGB values 255 255 255 using PHP?
Php Solutions
Solution 1 - Php
If you want to convert hex to rgb you can use sscanf:
<?php
$hex = "#ff9900";
list($r, $g, $b) = sscanf($hex, "#%02x%02x%02x");
echo "$hex -> $r $g $b";
?>
Output:
#ff9900 -> 255 153 0
Solution 2 - Php
Check out PHP's hexdec() and dechex() functions:
http://php.net/manual/en/function.hexdec.php
Example:
$value = hexdec('ff'); // $value = 255
Solution 3 - Php
I made a function which also returns alpha if alpha is provided as a second parameter the code is below.
The function
function hexToRgb($hex, $alpha = false) {
$hex = str_replace('#', '', $hex);
$length = strlen($hex);
$rgb['r'] = hexdec($length == 6 ? substr($hex, 0, 2) : ($length == 3 ? str_repeat(substr($hex, 0, 1), 2) : 0));
$rgb['g'] = hexdec($length == 6 ? substr($hex, 2, 2) : ($length == 3 ? str_repeat(substr($hex, 1, 1), 2) : 0));
$rgb['b'] = hexdec($length == 6 ? substr($hex, 4, 2) : ($length == 3 ? str_repeat(substr($hex, 2, 1), 2) : 0));
if ( $alpha ) {
$rgb['a'] = $alpha;
}
return $rgb;
}
Example of function responses
print_r(hexToRgb('#19b698'));
Array (
[r] => 25
[g] => 182
[b] => 152
)
print_r(hexToRgb('19b698'));
Array (
[r] => 25
[g] => 182
[b] => 152
)
print_r(hexToRgb('#19b698', 1));
Array (
[r] => 25
[g] => 182
[b] => 152
[a] => 1
)
print_r(hexToRgb('#fff'));
Array (
[r] => 255
[g] => 255
[b] => 255
)
If you'd like to return the rgb(a) in CSS format just replace the return $rgb; line in the function with return implode(array_keys($rgb)) . '(' . implode(', ', $rgb) . ')';
Solution 4 - Php
For anyone that is interested this is another very simple way of doing it. This example assumes there is exactly 6 characters and no preceding pound sign.
list($r, $g, $b) = array_map('hexdec', str_split($colorName, 2));
Here is an example the supports 4 different inputs (abc, aabbcc, #abc, #aabbcc):
list($r, $g, $b) = array_map(
function ($c) {
return hexdec(str_pad($c, 2, $c));
},
str_split(ltrim($colorName, '#'), strlen($colorName) > 4 ? 2 : 1)
);
Solution 5 - Php
You can use the function hexdec(hexStr: String) to get the decimal value of a hexadecimal string.
See below for an example:
$split = str_split("ffffff", 2);
$r = hexdec($split[0]);
$g = hexdec($split[1]);
$b = hexdec($split[2]);
echo "rgb(" . $r . ", " . $g . ", " . $b . ")";
This will print rgb(255, 255, 255)
Solution 6 - Php
You can try this simple piece of code below.
list($r, $g, $b) = sscanf(#7bde84, "#%02x%02x%02x");
echo $r . "," . $g . "," . $b;
This will return 123,222,132
Solution 7 - Php
My approach to take care of hex colors with or without hash, single values or pair values:
function hex2rgb ( $hex_color ) {
$values = str_replace( '#', '', $hex_color );
switch ( strlen( $values ) ) {
case 3;
list( $r, $g, $b ) = sscanf( $values, "%1s%1s%1s" );
return [ hexdec( "$r$r" ), hexdec( "$g$g" ), hexdec( "$b$b" ) ];
case 6;
return array_map( 'hexdec', sscanf( $values, "%2s%2s%2s" ) );
default:
return false;
}
}
// returns array(255,68,204)
var_dump( hex2rgb( '#ff44cc' ) );
var_dump( hex2rgb( 'ff44cc' ) );
var_dump( hex2rgb( '#f4c' ) );
var_dump( hex2rgb( 'f4c' ) );
// returns false
var_dump( hex2rgb( '#f4' ) );
var_dump( hex2rgb( 'f489' ) );
Solution 8 - Php
I wrote a simple function like so, which supports an input value with or without beginning # and it can also take 3 or 6 character hex code input:
function hex2rgb( $color ) {
if ($color[0] == '#') {
$color = substr($color, 1);
}
list($r, $g, $b) = array_map("hexdec", str_split($color, (strlen( $color ) / 3)));
return array( 'red' => $r, 'green' => $g, 'blue' => $b );
}
This returns an associative array that can be access as $color['red'], $color['green'], $color['blue'];
See also here from CSS Tricks.
Solution 9 - Php
I've put @John's answer and @iic's comment/idea together into a function which can handle both, the usual hex color codes and the shorthand color codes.
A short explanation:
With scanf I read the r, g and b values from the hex color as strings. Not as hex values like in @John's answer. In case of using shorthand color codes, the r, g and b strings have to be doubled ("f" -> "ff" etc.) before converting them to decimals.
function hex2rgb($hexColor)
{
$shorthand = (strlen($hexColor) == 4);
list($r, $g, $b) = $shorthand? sscanf($hexColor, "#%1s%1s%1s") : sscanf($hexColor, "#%2s%2s%2s");
return [
"r" => hexdec($shorthand? "$r$r" : $r),
"g" => hexdec($shorthand? "$g$g" : $g),
"b" => hexdec($shorthand? "$b$b" : $b)
];
}
Solution 10 - Php
Convert Color Code HEX to RGB
$color = '#ffffff';
$hex = str_replace('#','', $color);
if(strlen($hex) == 3):
$rgbArray['r'] = hexdec(substr($hex,0,1).substr($hex,0,1));
$rgbArray['g'] = hexdec(substr($hex,1,1).substr($hex,1,1));
$rgbArray['b'] = hexdec(substr($hex,2,1).substr($hex,2,1));
else:
$rgbArray['r'] = hexdec(substr($hex,0,2));
$rgbArray['g'] = hexdec(substr($hex,2,2));
$rgbArray['b'] = hexdec(substr($hex,4,2));
endif;
print_r($rgbArray);
Output
Array ( [r] => 255 [g] => 255 [b] => 255 )
I have found this reference from here - Convert Color Hex to RGB and RGB to Hex using PHP
Solution 11 - Php
Borrowing from @jhon's answer - this will return the rgb in string format with an option for opacity.
function convert_hex_to_rgba($hex, $opacity = 1){
list($r, $g, $b) = sscanf($hex, "#%02x%02x%02x");
return sprintf('rgba(%s, %s, %s, %s)', $r, $g, $b, $opacity);
}
convert_hex_to_rgba($bg_color, 0.9) // rgba(2,2,2,0.9)
Solution 12 - Php
try this, it converts its arguments (r, g, b) to hexadecimal html-color string #RRGGBB Arguments are converted to integers and trimmed to 0..255 range
<?php
function rgb2html($r, $g=-1, $b=-1)
{
if (is_array($r) && sizeof($r) == 3)
list($r, $g, $b) = $r;
$r = intval($r); $g = intval($g);
$b = intval($b);
$r = dechex($r<0?0:($r>255?255:$r));
$g = dechex($g<0?0:($g>255?255:$g));
$b = dechex($b<0?0:($b>255?255:$b));
$color = (strlen($r) < 2?'0':'').$r;
$color .= (strlen($g) < 2?'0':'').$g;
$color .= (strlen($b) < 2?'0':'').$b;
return '#'.$color;
}
?>
oh and the other way round
# character in the beginning can be omitted. Function returns array of three integers in range (0..255) or false when it fails to recognize color format.
<?php
function html2rgb($color)
{
if ($color[0] == '#')
$color = substr($color, 1);
if (strlen($color) == 6)
list($r, $g, $b) = array($color[0].$color[1],
$color[2].$color[3],
$color[4].$color[5]);
elseif (strlen($color) == 3)
list($r, $g, $b) = array($color[0].$color[0], $color[1].$color[1], $color[2].$color[2]);
else
return false;
$r = hexdec($r); $g = hexdec($g); $b = hexdec($b);
return array($r, $g, $b);
}
?>
Solution 13 - Php
//if u want to convert rgb to hex
$color='254,125,1';
$rgbarr=explode(",", $color);
echo sprintf("#%02x%02x%02x", $rgbarr[0], $rgbarr[1], $rgbarr[2]);
Solution 14 - Php
function RGB($hex = '')
{
$hex = str_replace('#', '', $hex);
if(strlen($hex) > 3) $color = str_split($hex, 2);
else $color = str_split($hex);
return [hexdec($color[0]), hexdec($color[1]), hexdec($color[2])];
}
Solution 15 - Php
Enjoy
public static function hexColorToRgba($hex, float $a){
if($a < 0.0 || $a > 1.0){
$a = 1.0;
}
for ($i = 1; $i <= 5; $i = $i+2){
$rgb[] = hexdec(substr($hex,$i,2));
}
return"rgba({$rgb[0]},{$rgb[1]},{$rgb[2]},$a)";
}
Solution 16 - Php
My solution: (Supports short notation)
$color = "#0ab";
$colort = trim( $color );
if( $colort and is_string( $color ) and preg_match( "~^#?([abcdef0-9]{3}|[abcdef0-9]{6})$~ui", $colort ))
{
if( preg_match( "~^#?[abcdef0-9]{3}$~ui", $colort ))
{
$hex = trim( $colort, "#" );
list( $hexR, $hexG, $hexB ) = str_split( $hex );
$hexR .= $hexR;
$hexG .= $hexG;
$hexB .= $hexB;
}
else
{
$hex = trim( $colort, "#" );
list( $hexR, $hexG, $hexB ) = str_split( $hex, 2 );
}
$colorR = hexdec( $hexR );
$colorG = hexdec( $hexG );
$colorB = hexdec( $hexB );
}
// Test
echo $colorR ."/" .$colorG ."/" .$colorB;
// → 0/170/187
Solution 17 - Php
If you want to get hex to RGB you can follow this:
class RGB
{
private $color; //#ff0000
private $red;
private $green;
private $blue;
public function __construct($colorCode = '')
{
$this->color = ltrim($colorCode, '#');
$this->parseColor();
}
public function readRGBColor()
{
echo "Red = {$this->red}\nGreen = {$this->green}\nBlue = {$this->blue}";
}
private function parseColor()
{
if ($this->color) {
list($this->red, $this->green, $this->blue) = sscanf($this->color, '%02x%02x%02x');
} else {
list($this->red, $this->green, $this->blue) = array(0, 0, 0);
}
}
}
$myColor = new RGB("#ffffff");
$myColor->readRGBColor();