PHP detects whether png images are intact_PHP tutorial

php checks whether the png image is intact

$filename = './D243375_0.png';

$filename = realpath($filename);

if (!file_exists( $filename)) {
die("The picture does not exist~!");
}

$size = getimagesize ($filename);

$file_extension = strtolower(substr (strrchr($filename,"."),1));

if("image/png" != $size['mime'] || $file_extension != "png"){
die("This is not a complete png picture~");
}

$img = @imagecreatefrompng ($filename);

if($img){
ob_start("output_handler");

imagepng($img);

ob_end_flush();
}else{
die("Cannot create png graphics correctly, please Check whether the png graphics are intact~");
}

function output_handler($img) {
header('Content-type: image/png');
header('Content- Length:'.strlen($img));
return $img;
}
?>

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