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LonelyTower

A RGB() function to return in hex

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Hi all, I am currently coding a RGB() function for PHP. Basicially, the idea is that if you put in RGB(255, 255, 255) you will get the hexdemical #FFFFFF. What''s a good way to do this? Thanks in advance.

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In C++


int rgb(int r, int g, int b)
{
return (r<<16) + (g<<8) + b;
}


If PHP doesn't have the << operator, use

int rgb(int r, int g, int b)
{
return (r*65536) + (g*256) + b;
}


This gives it to you in numeric form, that's how I interpreted the question, if you want it in string form it should be a simple matter of converting each number->hex->string then combining the strings.

[edited by - cozman on March 7, 2004 1:01:20 AM]

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PHP has a build-in function to convert decimals to hex. So the following functions should solve your problem:
function rgbToHex ($r, $g, $b) 
{
$hex = array();

if (strlen($hex[0] = dechex($r)) == 1)
$hex[0] = '0'.$hex

if (strlen($hex[1] = dechex($g)) == 1)
$hex[1] = '0'.$hex

if (strlen($hex[2] = dechex($b)) == 1)
$hex[2] = '0'.$hex

return $hex;
}

Edit: The function returns an array now.

- Gom Jabbar

[edited by - Gom Jabbar on March 7, 2004 9:13:55 AM]

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