php检测png图片是否完好

php检测png图片是否完好

php检测png图片是否完好

<?php

$filename = ‘./D243375_0.png’;

$filename = realpath($filename);

if (!file_exists($filename)) {
die(“圖片不存在~!”);
}

$size = getimagesize ($filename);

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

if(“image/png” != $size['mime'] || $file_extension != “png”){
die(“這不是一張完整的png圖片~”);
}

$img = @imagecreatefrompng ($filename);

if($img){
ob_start(“output_handler”);

imagepng($img);

ob_end_flush();
}else{
die(“不能正確的創建png圖形,請檢查png圖形是否完好~”);
}

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

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