7 ways to get the suffix name of PHP files

The content of this article is to share with you 7 ways to obtain the suffix name of PHP files. It has certain reference value. Friends in need can refer to it

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First type:

$file = 'x.y.z.png';
echo substr(strrchr($file, '.'), 1);

Analysis: strrchr($file, '.')
strrchr() function finds the last occurrence of a string in another string and returns the position from that string All characters from position to the end of the string

Second type:

$file = 'x.y.z.png';
echo substr($file, strrpos($file, '.')+1);

Analysis: strrpos($file, '.')
Find the position where "." last appeared in the string and return the position substr() intercepts from this position

The third type:

$file = 'x.y.z.png';
$arr=explode('.', $file);
echo $arr[count($arr)-1];

The fourth type:

$file = 'x.y.z.png';
$arr=explode('.', $file);
echo end($arr);  //end()返回数组的最后一个元素

The fifth type:

$file = 'x.y.z.png';
echo strrev(explode('.', strrev($file))[0]);

The sixth type:

.$file = 'x.y.z.png';
echo pathinfo($file)['extension'];

Analysis: pathinfo() The function returns the file path information in the form of an array.

Includes the following array elements:
##

[dirname]
[basename]
[extension]

th Seven types:

.$file = 'x.y.z.png';
echo pathinfo($file, PATHINFO_EXTENSION);

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

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