Convert hexadecimal values to decimal values

functions.php

function convert_hex2dec($hex) {

	// Remove hashmark, if present.
	if (substr($hex, 0, 1) === '#') {
		$hex = substr($hex, 1);
	}

	// Max of 8 characters.
	if (strlen($hex) > 8) {
		$hex = substr($hex, 0, 8);
	}

	// Count the characters.
	$length = strlen($hex);

	// Get hex as an array.
	$chars = str_split($hex);

	// Handle 3-digit hexes; convert to 6-digit counterparts.
	if ($length === 3) {
		$hex = $chars[0].$chars[0].$chars[1].$chars[1].$chars[2].$chars[2];
	}

	// Handle non-6-digit hexes; convert to 6-digit by padding with zero(s).
	if ($length !== 6) {
		$hex = str_pad($hex, 6, '0');
		$chars = str_split($hex);
	}

	// Handle (or append) alpha value.
	if (count($chars) === 6) {
		$chars[] = 'f';
		$chars[] = 'f';
	} else if (count($chars) === 7) {
		$chars[] = $chars[6];
	}

	// Initialization.
	$values = [];

	// RGB values.
	$values['rgb_r'] = hexdec($chars[0].$chars[1]);
	$values['rgb_g'] = hexdec($chars[2].$chars[3]);
	$values['rgb_b'] = hexdec($chars[4].$chars[5]);
	$values['rgb_a'] = hexdec($chars[6].$chars[7]);

	// HEX values.
	$values['hex_r'] = $chars[0].$chars[1];
	$values['hex_g'] = $chars[2].$chars[3];
	$values['hex_b'] = $chars[4].$chars[5];
	$values['hex_a'] = $chars[6].$chars[7];

	// Assembled hex value.
	$values['hex'] = $values['hex_r'].$values['hex_g'].$values['hex_b'];

	// Return the values.
	return $values;

}