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。
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)) 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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