(PHP 4 >= 4.0.6, PHP 5, PHP 7)
imagecolorexactalpha — Get the index of the specified color + alpha
$image
, int $red
, int $green
, int $blue
, int $alpha
)Returns the index of the specified color+alpha in the palette of the image.
image
O resursă - imagine, întoarsă de una din funcțiile de creare a imaginilor, cum ar fi imagecreatetruecolor().
red
Valoarea componentei roșii.
green
Valoarea componentei verzi.
blue
Valoarea componentei albastre.
alpha
A value between 0 and 127. 0 indicates completely opaque while 127 indicates completely transparent.
Returns the index of the specified color+alpha in the palette of the image, or -1 if the color does not exist in the image's palette.
Example #1 Get colors from the GD logo
<?php
// Setup an image
$im = imagecreatefrompng('./gdlogo.png');
$colors = Array();
$colors[] = imagecolorexactalpha($im, 255, 0, 0, 0);
$colors[] = imagecolorexactalpha($im, 0, 0, 0, 127);
$colors[] = imagecolorexactalpha($im, 255, 255, 255, 55);
$colors[] = imagecolorexactalpha($im, 100, 255, 52, 20);
print_r($colors);
// Free from memory
imagedestroy($im);
?>
Exemplul de mai sus va afișa ceva similar cu:
Array ( [0] => 16711680 [1] => 2130706432 [2] => 939524095 [3] => 342163252 )