PHP get file extension instance parsing

PHP Get File Extension Example

First:

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

Parsing: strrchr ($file, '.')

strrchr() function finds the last occurrence of a string in another string and returns all characters from that 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 last occurrence of "." in the string, and return the position substr() from that Position start interception

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]);

Sixth type:

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

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

Includes the following array elements:

[dirname]
[basename]
[extension]

The seventh type:

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

Summary: I personally prefer the seventh one Kind of

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