php 判断是不是为PNG格式的图片

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;}}