PHP | imagecreatetruecolor() Function

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

Reference: http://php.net/manual/en/function.imagecreatetruecolor.php