getimagesize(真实格式,支持base64)
代码:
<?php/*@desc:获取图片真实后缀@param name 文件名@return suffix 文件后缀*/ function getimgsuffix($name) {$info = getimagesize($name);$suffix = false;if($mime = $info['mime']){$suffix = explode('/',$mime)[1];}return $suffix;}
测试:
$suffix = getimgsuffix('http://192.168.8.81/public/image/01.jpg');echo $suffix;
输出:
jpeg
二进制方法(真实格式)
代码:
<?php/*@desc:获取文件真实后缀@param name 文件名@return suffix 文件后缀*/ function getfilesuffix($name) {$file = fopen($name, "rb");$bin = fread($file, 2); // 只读2字节fclose($file);$info = @unpack("C2chars", $bin);$code = intval($info['chars1'] . $info['chars2']);$suffix = "unknow";if($code == 255216){$suffix = "jpg";}elseif($code == 7173){$suffix = "gif";}elseif($code == 13780){$suffix = "png";}elseif($code == 6677){$suffix = "bmp";}elseif($code == 7798){$suffix = "exe";}elseif($code == 7784){$suffix = "midi";}elseif($code == 8297){$suffix = "rar";}elseif($code == 7368){$suffix = "mp3";}elseif($code == 0){$suffix = "mp4";}elseif($code == 8273){$suffix = "wav";}return $suffix;}
测试:
$suffix = getfilesuffix('http://192.168.8.81/public/image/01.jpg');echo $suffix;
输出:
jpg
strrchr strrpos substr
<?php$filename = "phpddt.jpg";echo substr(strrchr($filename,"."),1);?>
或
<?php$filename = "phpddt.jpg";echo substr($filename,strrpos($filename,".")+1);?>
explode array_pop
<?php$filename = "phpddt.jpg";$arr = explode(".",$filename);echo array_pop($arr);?>
pathinfo
<?php$filename = "phpddt.jpg";$info = pathinfo($filename);echo $info['extension'];?>
或
<?php$filename = "phpddt.jpg";echo pathinfo($filename,PATHINFO_EXTENSION);?>
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