(PHP 4 >= 4.3.0, PHP 5, PHP 7)
exif_imagetype — 判断一个图像的类型
图像类型常量
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<?php
if (exif_imagetype("image.gif") != IMAGETYPE_GIF) {
echo "The picture is not a gif";
}
if (in_array(exif_imagetype("path/to/file"), array(IMAGETYPE_GIF , IMAGETYPE_JPEG ,IMAGETYPE_PNG , IMAGETYPE_BMP))) {
echo "This is a picture ";
}
?>