php 判断是否为PNG格式的图片
function isPng($pngPath){
$size = getimagesize ($pngPath);
$file_extension = strtolower(substr(strrchr($pngPath,'.'),1));
if('image/png' != $size['mime'] || $file_extension != 'png')
{
return FALSE;
}
else {
return TRUE;
}
}
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