The imagecolorat() function gets the index of the color of the pixel.

Syntax

imagecolorat( $img, $x, $y )

Parameters

• img: Create an image with imagecreatetruecolor() function.

• x: The x-coordinate of the point.

• y: The y-coordinate of the point.

Return

The imagecolorat() function returns the color index or FALSE on failure.

Example

The following is an example:

 Live Demo

<?php
   $img = imagecreatefrompng("http://www.tutorialspoint.com/images/tp-logo-diamond.png");
   $rgb = imagecolorat($img, 15, 25);
   $colors = imagecolorsforindex($img, $rgb);
   var_dump($colors);
?>

输出

以下是输出结果：

array(4) { ["red"]=> int(255) ["green"]=> int(255) ["blue"]=> int(255) ["alpha"]=> int(127) }