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Homephp教程PHP源码php判断图片格式各种方法总结

在php文件上传时我们都会要用到判断文件类型,下面我来介绍几种常用见判断文件类型格式的实例。

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php中如何判断图片格式,下面给出一种较为简便的方法:

第一种思想方法就是把图片路径当作字符串来处理,那么判断图片格式的也就是变成了查找.号的字符串

 代码如下 复制代码

$file= "test.jpg";

$filetype= strtolower(strrchr($file,"."));

$arrtype = array(".jpeg",".bmp",".gif",".jpg");

if(!in_array($filetype,$arrtype))
{
echo '不符合格式';

exit;

}

getimagesize获取图片大小格式的方式,这个不是gd类库函数这个方法很经典,不仅可以用来判断图片格式还可以获得图片长宽信息

一个示例如下:

 代码如下 复制代码
$array = getimagesize(“images/flower_1.jpg”);
print_r($array);

该函数的返回值是一个数组,内容大致如下:

 代码如下 复制代码
Array
(
    [0] => 350
    [1] => 318
    [2] => 2
    [3] => width=”350″ height=”318″
    [bits] => 8
    [channels] => 3
    [mime] => image/jpeg
)
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