How to get the file extension in php

This article mainly introduces how to obtain the file suffix name in PHP. Interested friends can refer to it. I hope it will be helpful to everyone.

There are many similar methods on the Internet, but they all have loose problems. This article will not analyze them one by one. Here we only give the most correct way to use php to obtain the file extension (file suffix). Methods.

function get_extension($filename){ 
  return pathinfo($filename,PATHINFO_EXTENSION); 
}

The PHP built-in function pathinfo is used in the function. Let’s analyze the meaning and usage of this function:
Definition and usage
pathinfo() function takes the form of an array The form returns file path information.
Syntax
pathinfo(path,options)

Description: pathinfo() returns an associative array containing path information. Array elements include the following values: [dirname]
[basename]
[extension]
For example:

<?php 
print_r(pathinfo("/testweb/test.txt")); 
?>

The above will output the following Result:

Array(
 [dirname] => /testweb
 [basename] => test.txt
 [extension] => txt
)

Summary: The above is the entire content of this article, I hope it will be helpful to everyone's study.

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