leading zeroes in hexadecimals 1

[MasterKaos]

Ok, i had a very similar question a few days ago about leading zeroes in integers, and it was pointed out that the sprintf() function did this no problems.

But what about hexadecimals? I'm writing a function that takes an array with three integers (one each for red, green, blue) and creates a 6 digit hexadecimal colour code to be used in HTML:

$colour = array(r=>254, g=>213, b=>0);

...

function tohex($colour)
{
	$output="";
	$output.= dechex($colour[r]);
	$output.= dechex($colour[g]);
	$output.= dechex($colour[b]);
	return $output;
}

but the problem is single digit numbers mess the whole thing up, for example "F0F" won;t work in HTML, it would have to be "0F000F" for HTML.

Any ideas how to do this?

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The first 90% of the code accounts for the first 90% of the development time. The remaining 10% of the code accounts for the other 90% of the development time.

 

[KarveR]

function tohex($colour)
{
$output="";
$output.= str_pad(dechex($colour[r]),2,0,STR_PAD_LEFT);
$output.= str_pad(dechex($colour[g]),2,0,STR_PAD_LEFT);
$output.= str_pad(dechex($colour),2,0,STR_PAD_LEFT);
return $output;
}


______________________________________________________________________
There's no present like the time, they say. - Henry's Cat.

 

[MasterKaos]

Thankyou! Works beautifully

----------------------------------------------------------------------------
The first 90% of the code accounts for the first 90% of the development time. The remaining 10% of the code accounts for the other 90% of the development time.

 

[sleipnir214]

Don't forget that printf() can solve this problem, too.

This script:

<?php
$color = array('r' => 254, 'g' => 213, 'b' => 0);

printf ('%02X%02X%02X', $color['r'], $color['g'], $color['b']);
?>

Outputs:

FED500





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