Online PHP editor | rfc for 1iUh1

@ 2016-08-04T22:43:22Z

<?php

/**
 * Parses an RGBA string and returns and array with each color
 * @param  string $str The RGBA string, ex: "rgba(66, 66, 66, 1)"
 * @return array       Returns an array with each r, g, b and a value or false if an invalid string is passed in.
 */
function parseRGBA($str){
	//match the rgba string and get it's part
	if(preg_match('/rgba\( *([\d\.-]+), *([\d\.-]+), *([\d\.-]+), *([\d\.-]+) *\)/i', $str, $m)){
		$out = array(
			'r'=>intval($m[1]), //get the red
			'g'=>intval($m[2]), //get the green
			'b'=>intval($m[3]), //get the blue
			'a'=>round(floatval($m[4]) * 255), //get the alpha and scale to 0-255
		);

		//clamp each  value between 0 and 255
		array_walk($out, function(&$v){ $v = min(255, max(0, $v)); });

		return $out;
	}
	return false;
}
echo '<pre>';
echo "Normal value: ";
print_r(parseRGBA("rgba(66, 66, 66, 1)"));

echo "Red > 255: ";
print_r(parseRGBA("rgba(660, 66, 66, 1)"));

echo "Green < 0: ";
print_r(parseRGBA("rgba(66, -66, 66, 1)"));

echo "Alpha float (normal): ";
print_r(parseRGBA("rgba(66, 66, 66, 0.6)"));

echo "Alpha overflow: ";
print_r(parseRGBA("rgba(66, 66, 66, 10)"));

Output for git.master, git.master_jit, rfc.property-hooks: <pre>Normal value: Array ( [r] => 66 [g] => 66 [b] => 66 [a] => 255 ) Red > 255: Array ( [r] => 255 [g] => 66 [b] => 66 [a] => 255 ) Green < 0: Array ( [r] => 66 [g] => 0 [b] => 66 [a] => 255 ) Alpha float (normal): Array ( [r] => 66 [g] => 66 [b] => 66 [a] => 153 ) Alpha overflow: Array ( [r] => 66 [g] => 66 [b] => 66 [a] => 255 )

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2022-12-01 RFC: Property hooks - included in PHP 8.4
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2020-12-04 Enumerations - included in PHP 8.1
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2015-08-27 Callable Prototypes - declined
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2015-02-18 Scalar type hints v5 - included in PHP 7
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