7 ways to get file extensions in PHP

This article introduces the 7 methods of obtaining file suffix names in PHP. It has certain reference value. Now I share it with you. Friends in need can refer to it

1.$file = 'x.y.z.png';
echo substr(strrchr($file, '.'), 1);
解析：strrchr($file, '.')   
 strrchr() 函数查找字符串在另一个字符串中最后一次出现的位置，并返回从该位置到字符串结尾的所有字符
2.$file = 'x.y.z.png';
echo substr($file, strrpos($file, '.')+1);
解析：strrpos($file, '.')   
查找 "." 在字符串中最后一次出现的位置,返回位置   substr()从该位置开始截取
3.$file = 'x.y.z.png';
$arr=explode('.', $file);
echo $arr[count($arr)-1];
4.$file = 'x.y.z.png';
$arr=explode('.', $file);
echo end($arr);  //end()返回数组的最后一个元素
5.$file = 'x.y.z.png';
echo strrev(explode('.', strrev($file))[0]);
6.$file = 'x.y.z.png';
echo pathinfo($file)['extension'];
解析：pathinfo() 函数以数组的形式返回文件路径的信息。包括以下的数组元素：
[dirname]
[basename]
[extension]
7.$file = 'x.y.z.png';
echo pathinfo($file, PATHINFO_EXTENSION);

Summary: 2 types of string interception, 3 types of array splitting, 2 types of path functions

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