The imagecreatetruecolor() function is an inbuilt function in PHP which is used to create a new true-color image. This function returns a blank image of the given size.
Syntax:
resource imagecreatetruecolor( $width, $height )
Parameters: This function accepts two parameters as mentioned above and described below:
- $width: This parameter is used to set the width of image.
- $height: This parameter is used to set the height of image.
Return Value: This function returns an image resource identifier on success, or False on errors.
Below programs illustrate the imagecreatetruecolor() function in PHP:
Program 1:
<?php     // Set the vertices of polygon $values = array(             150, 50, // Point 1 (x, y)             50, 250, // Point 2 (x, y)             250, 250 // Point 3 (x, y)         );       // Create the size of image or blank image $image = imagecreatetruecolor(300, 300);     // Set the background color of image $background_color = imagecolorallocate($image, 0, 153, 0);      // Fill background with above selected color imagefill($image, 0, 0, $background_color);    // Allocate a color for the polygon $image_color = imagecolorallocate($image, 255, 255, 255);      // Draw the polygon imagepolygon($image, $values, 3, $image_color);      // Output the picture to the browser header('Content-type: image/png');      imagepng($image); ?> |
output:
Program 2:
<?php    // Create the size of image or blank image. $image = imagecreatetruecolor(500, 300);    // Display the height of image. echo imagesy($image);    ?> |
output:
300
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Reference: http://php.net/manual/en/function.imagecreatetruecolor.php
