php convert hex ke rgba
/**
* Convert hexadecimal string to rgba output
* @param string $hex_color
* @return string
*/
function hex2rgba(string $hex_color):string
{
// Remove '#' from the input
$hex_color = str_replace('#', '', $hex_color);
// Return black if provided color isn't 3, 4, 6, or 8 characters
if ( !in_array(strlen($hex_color), [3,4,6,8]) ) {
return 'rgb(0,0,0,1)';
}
// If using 3 or 4 character shorthand, convert to full
if ( strlen($hex_color) <= 4 ) {
// Split into array of single characters
$hex_arr = str_split($hex_color);
// Double each character
$hex_arr = array_map(fn($c) => $c[0] . $c[0], $hex_arr);
} else {
// Split into array of character couplets
$hex_arr = str_split($hex_color, 2);
}
// If only three groups, add opaque alpha group
if ( count($hex_arr) === 3 ) {
$hex_arr[] = 'ff';
}
// Apply hexadecimal to decimal conversion on each couplet
$dec_arr = array_map('hexdec', $hex_arr);
// Divide the alpha channel by 255 (converts to 0...1)
$dec_arr[3] /= 255;
// Glue the pieces back together and return inside 'rgba()'
return 'rgba(' . implode(",", $dec_arr) . ')';
}
P. Tune