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

Recommended tutorial: "PHP Video Tutorial"

The above is the detailed content of PHP get file extension instance parsing. For more information, please follow other related articles on the PHP Chinese website!