php - Transparent Overlay Creating PNG -


i have below function , i've gotten size need, i'm adding background image , looking add text overlay transparent background on overlay text imagefilledrectangle applies variable $white expected, i'm trying see if there anyway tell function transparent instead of accepting colour, white in instance, php docs colour required parameter imagefilledrectangle, suggestions appreciated.

the background image local image:

define("background_file", "background.png");

function:

public function generateimage() {     if (file_exists(background_file)) {              $im = @imagecreatefrompng(background_file);          if($im) {             $white = imagecolorallocate($im, 255, 255, 255);             $black = imagecolorallocate($im, 115, 150, 195);              imagefilledrectangle($im, 0, 0, 399, 29, $white);              $text = 'test';             $font = 'arial_narrow_7.ttf';              imagettftext($im, 20, 0, 10, 20, $black, $font, $text);              imagepng($im);             imagedestroy($im);         } else {             echo 'error';         }     } }

i tried adding imagecolortransparent($im, $white); before imagefilledrectangle didn't make difference.

figured out, there no need have imagefilledrectangle line in function, below gives transparent overlay text elements no fill being applied.

public function generateimage() {     if (file_exists(background_file)) {              $im = @imagecreatefrompng(background_file);          if($im) {             $black = imagecolorallocate($im, 115, 150, 195);              $text = 'test';             $font = 'arial_narrow_7.ttf';              imagettftext($im, 20, 0, 10, 20, $black, $font, $text);              imagepng($im);             imagedestroy($im);         } else {             echo 'error';         }     } }

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