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mono', 'courier new', courier, monospace; color: #c00000; font-size: 14px;">PHP：6种方法获取文件的扩展名
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1、字符串查找和截取的方法
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1
class="php variable" style="background-image: none !important; text-align: left !important; line-height: 1.1em !important; font-style: normal !important; margin: 0px; width: auto !important; font-family: Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace !important; float: none !important; color: #aa7700 !important; font-size: 1em !important; vertical-align: baseline !important; overflow: visible !important; font-weight: normal !important; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; border: 0px; padding: 0px !important;">$extension=functions" style="background-image: none !important; text-align: left !important; line-height: 1.1em !important; font-style: normal !important; margin: 0px; width: auto !important; font-family: Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace !important; float: none !important; color: #ff1493 !important; font-size: 1em !important; vertical-align: baseline !important; overflow: visible !important; font-weight: normal !important; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; border: 0px; padding: 0px !important;">substr(strrchr($file,?'.'), 1);
2、字符串查找和截取的方法二
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1$extension=substr($file,?strrpos($file,?'.')+1);
3、数组分割的方法
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1$extension=end(explode('.',?$file));
4、使用pathinfo直接解析的方法
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1 2$info?=?pathinfo($file);
$extension=$info['extension'];
5、使用pathinfo的第二个参数
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1$extension=pathinfo($file, PATHINFO_EXTENSION);
6、使用finfo_file函数
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1 2 3 4$finfo?= finfo_open(FILEINFO_MIME_TYPE);
$extension?= finfo_file($finfo,?$file) ;
echo?$extension;
finfo_close($finfo);
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