Home >Backend Development >PHP Problem >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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