How to get file extension in PHP
I believe many inexperienced people don't know what to do about how to get the file extension in PHP. Therefore, this article summarizes the causes and solutions of the problem. Through this article, I hope you can solve this problem.
/ / method 1:
Function extend_1 ($file_name)
{
$retval= ""
$pt=strrpos ($file_name, ".")
If ($pt) $retval=substr ($file_name, $pt+1, strlen ($file_name)-$pt)
Return ($retval)
}
/ / method 2
Php code
Function extend_2 ($file_name)
{
$extend = pathinfo ($file_name)
$extend = strtolower ($extend ["extension"])
Return $extend
}
Function extend_2 ($file_name) {$extend = pathinfo ($file_name); $extend = strtolower ($extend ["extension"]); return $extend;}
/ / method 3
Php code
Function extend_3 ($file_name)
{
$extend = explode (".", $file_name)
$va=count ($extend)-1
Return $extend [$va]
}
Function extend_3 ($file_name) {$extend = explode (".", $file_name); $va=count ($extend)-1; return $extend [$va];}
/ / method 4
Php code
Function getFileExt ($file_name)
{
While ($dot = strpos ($file_name, "."))
{
$file_name = substr ($file_name, $dot+1)
}
Return $file_name
}
? >
Function getFileExt ($file_name) {while ($dot = strpos ($file_name, ".")) {$file_name = substr ($file_name, $dot+1);} return $file_name;}? >
In addition:
PHP pathinfo () function
PHP Filesystem function
Definition and usage
The pathinfo () function returns information about the file path as an array.
Grammar.
Pathinfo (path,options)
Parameters.
Description
Path
Necessary. Specify the path to be checked.
Process_sections
Optional. Specifies the array elements to return. The default is all.
Possible values:
PATHINFO_DIRNAME-only dirname is returned
PATHINFO_BASENAME-only basename is returned
PATHINFO_EXTENSION-only extension is returned
Description
Pathinfo () returns an associative array containing information about path.
Includes the following array elements:
[dirname]
[basename]
[extension]
Tips and comments
Note: if all units are not required, the pathinfo () function returns a string.
Example Wuhan Renji Integrated traditional Chinese and Western Medicine Hospital http://www.whrjkf.com/
Example 1
Php code
/ / output:
/ / Array ([dirname] = > / testweb [basename] = > test.txt [extension] = > txt)
/ / output: / / Array ([dirname] = > / testweb [basename] = > test.txt [extension] = > txt)
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