Home > Article > Backend Development > What are the three ways to get the file extension in php
Obtaining method: 1. Use the "array_pop(explode('.', file name))" statement; 2. Use the "pathinfo (file name) ['extension']" statement; 3. Use "strrev (strchr(strrev(filename),'.',true))" statement.
The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer
php gets the file suffix Name method 1:
<?php function getExt1($filename) { $arr = explode('.',$filename); return array_pop($arr); } $str="dir/upload.image.jpg"; echo getExt1($str); ?>
Output:
jpg
Description:
explode() function uses a string split Another string and returns an array of strings.
array_pop() function deletes the last element in the array.
php method 2 to get the file suffix name:
<?php function getExt4($filename) { $arr = pathinfo($filename); $ext = $arr['extension']; return $ext; } $str="dir/upload.image.jpg"; echo getExt4($str); ?>
Output:
jpg
Description:
pathinfo() function returns information about the file path in the form of an array.
The returned array elements are as follows:
[dirname]: directory path
[basename]: file name
[extension]: File suffix name
[filename]: File name without suffix
php method 3 to get the file suffix name:
<?php function getExt5($filename) { $str = strrev($filename); return strrev(strchr($str,'.',true)); } $str="dir/upload.image.jpg"; echo getExt5($str); ?>
Output:
jpg
Description:
strrev() function reverses a string.
strchr() function searches for the first occurrence of a string in another string. Syntax:
strchr(string,search,before_search);
Parameter | Description |
---|---|
string | Required. Specifies the string to be searched for. |
search | Required. Specifies the string to search for. If the argument is a number, searches for characters that match the ASCII value for that number. |
before_search | Optional. A Boolean value with a default value of "false". If set to "true", it will return the portion of the string preceding the first occurrence of the search parameter. |
Return value: Returns the rest of the string (from the matching point). Returns FALSE if the searched string is not found.
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