imagecreatefrompng
(PHP 3 >= 3.0.13, PHP 4, PHP 5)
imagecreatefrompng -- Create a new image from file or URL
Description
resource
imagecreatefrompng ( string filename )
imagecreatefrompng() returns an image identifier
representing the image obtained from the given filename.
imagecreatefrompng() returns an empty string
on failure. It also outputs an error message, which unfortunately
displays as a broken link in a browser. To ease debugging the
following example will produce an error PNG:
Example 1. Example to handle an error during creation
<?php
function LoadPNG($imgname)
{
$im = @imagecreatefrompng($imgname); /* Attempt to open */
if (!$im) { /* See if it failed */
$im = imagecreatetruecolor(150, 30); /* Create a blank image */
$bgc = imagecolorallocate($im, 255, 255, 255);
$tc = imagecolorallocate($im, 0, 0, 0);
imagefilledrectangle($im, 0, 0, 150, 30, $bgc);
/* Output an errmsg */
imagestring($im, 1, 5, 5, "Error loading $imgname", $tc);
}
return $im;
}
header("Content-Type: image/png");
$img = LoadPNG("bogus.image");
imagepng($img);
?>
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The above example will output
something similar to: 
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Tip: You can use a URL as a
filename with this function if the fopen wrappers have been enabled.
See fopen() for more details on how to specify
the filename and Appendix O for a list of supported
URL protocols.
Parameters
filename
Path to the PNG image
Return Values
Returns an image resource identifier on success, FALSE on errors.
Notes
| Warning |
Windows versions of PHP
prior to PHP 4.3.0 do not support accessing remote files via this function, even if
allow_url_fopen is enabled.
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