Bug #73555 [Asn->Sus]: imagepng() doesn't properly report failure

Edit report at https://bugs.php.net/bug.php?id=73555&edit=1 ID: 73555 Updated by: cmb@php.net Reported by: cmb@php.net Summary: imagepng() doesn't properly report failure -Status: Assigned +Status: Suspended Type: Bug Package: GD related Operating System: * PHP Version: 5.6Git-2016-11-17 (Git) Assigned To: cmb Block user comment: N Private report: N New Comment: Unfortunately, this issue can't be resolved, because GD's image output functions don't return success/failure[1]. I'm suspending this ticket until this is resolved. [1] <https://github.com/libgd/libgd/issues/347> Previous Comments: ------------------------------------------------------------------------ [2016-11-17 13:18:58] cmb@php.net Description: ------------ imagepng() and other output functions don't properly report failure. For instance, if a read-only stream is passed to imagepng(), the function returns TRUE without any warning or notice, but obviously the image has not been written to the file. Test script: --------------- <?php $filename = __DIR__ . DIRECTORY_SEPARATOR . 'bug.png'; touch($filename); $stream = fopen($filename, 'r'); $im = imagecreatetruecolor(100, 100); var_dump(imagepng($im, $stream)); var_dump(filesize($filename)); Expected result: ---------------- bool(false) int(0) Actual result: -------------- bool(true) int(0) ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=73555&edit=1