PHP imagecreatefrompng Function: Syntax, Parameters, Return Value, and Example Usage

The imagecreatefrompng function creates a new image resource from a PNG file or URL.

Syntax : resource imagecreatefrompng(string $filename) It returns an image identifier representing the loaded image on success, or FALSE on failure.

Parameter

filename : Path to the PNG image file.

Return value

On success, an image resource is returned; on failure, FALSE is returned.

Example

<?php
function LoadPNG($imgname)
{
    // Attempt to open
    $im = @imagecreatefrompng($imgname);
    // See if it failed
    if (!$im) {
        // Create a blank image
        $im = imagecreatetruecolor(150, 30);
        $bgc = imagecolorallocate($im, 255, 255, 255);
        $tc = imagecolorallocate($im, 0, 0, 0);
        imagefilledrectangle($im, 0, 0, 150, 30, $bgc);
        // Output an error message
        imagestring($im, 1, 5, 5, 'Error loading ' . $imgname, $tc);
    }
    return $im;
}
header('Content-Type: image/png');
$img = LoadPNG('bogus.image');
imagepng($img);
imagedestroy($img);
?>

This example demonstrates loading a PNG file, handling a failure by creating a placeholder image with an error message, sending the appropriate header, outputting the image as PNG, and finally freeing the image resource.