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PHP判断一个gif图片是否为动态图片的方法及示例代码 - 站长搜索
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PHP判断一个gif图片是否为动态图片的方法及示例代码

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2014-11-30 18:39:07 转载来源: 网络整理/侵权必删

本文向大家讲解的是一个PHP判断一个gif图片是否为动态图片的方法及示例代码,涉及针对图片字节流中包含数据字段的判断,具有不错的实用价值,需要的朋友可以参考下 如何使用PHP来判断一个gif图片是否为动态图片(动画)?首先想到的是使用getimagesize()函数来看type值,发现都是gif,所以这个办法是不可行的。下面是作者在网上看到的一个函数,用来判断gif是否为动图的

本文向大家讲解的是一个PHP判断一个gif图片是否动态图片的方法示例代码,涉及针对图片字节流中包含数据字段的判断,具有不错的实用价值,需要的朋友可以参考下

如何使用PHP来判断一个gif图片是否为动态图片(动画)?首先想到的是使用getimagesize()函数来看type值,发现都是gif,所以这个办法是不可行的。下面是作者在网上看到的一个函数,用来判断gif是否为动图的。贴出来和大家分享

例子如下:

/*
 * 判断图片是否为动态图片(动画)
 */
function isAnimatedGif($filename) {
 $fp=fopen($filename,'rb');
 $filecontent=fread($fp,filesize($filename));
 fclose($fp);
 return strpos($filecontent,chr(0x21).chr(0xff).chr(0x0b).'NETSCAPE2.0')===FALSE?0:1;
}


或者这样做:
用PHP判断一个gif图片是不是动画(多帧)

<?php
function IsAnimatedGif($filename)
{
 $fp = fopen($filename, 'rb');
 $filecontent = fread($fp, filesize($filename));
 fclose($fp);
 return strpos($filecontent,chr(0x21).chr(0xff).chr(0x0b).'NETSCAPE2.0') === FALSE?0:1;
}
echo IsAnimatedGif("51windows.gif");
?>


例子2
gif动画是gif89格式的,发现文件开头是gif89。但是很多透明图片也是用的gif89格式,
GOOGLE到的:可以检查文件中是否包含:chr(0×21).chr(0xff).chr(0×0b).'NETSCAPE2.0'
chr(0×21).chr(0xff) 是gif图片中扩展功能段的标头,'NETSCAPE2.0'是扩展功能执行的程序名
程序代码如下:

<?php
function check($image){
$content= file_get_contents($image);
if(preg_match("/".chr(0x21).chr(0xff).chr(0x0b).'NETSCAPE2.0'."/",$content)){
return true;
}else{
return false;
}
}
if(check('/home/lyy/luoyinyou/2.gif')){
echo'真是动画';
}else{
echo'不是动画';
}
?>


测试发现,读取1024字节足够了,因为此时读取的数据流中正好包含了 chr(0×21).chr(0xff).chr(0×0b).'NETSCAPE2.0'


标签: 图片 PHP 判断 一个 gif 是否 动态 方法 示例


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