Php filename file extension

How to Get a File Extension in PHP

In PHP, there exist various ways of getting a file extension. In our tutorial, we have chosen the 5 best ways that will help you to get a file extension straightforwardly.

Go ahead and choose the one that matches your project better.

Explode a File Variable

The first way is exploding a file variable and getting the last element of the array. That will be a file extension. Here is how you can do it:

 $fileName = 'banner.jpg'; $fileNameParts = explode('.', $fileName); $ext = end($fileNameParts); echo $ext; ?>

Find the Last Occurrence of ‘.’

In the framework of the second approach, we recommend detecting the last occurrence of ‘.’, which will return a ‘.jpg’ . Afterwards, you need to remove the first character of a string using substr. As a result, the exact file extension ‘.jpg’ will be returned.

 $fileName = 'banner.jpg'; $ext = substr(strrchr($fileName, '.'), 1); echo $ext; ?>

Use strrpos

The next way is to use strrpos for detecting the position of the last occurrence of ‘.’ inside a file name, incrementing that position by 1 so that it explodes a string from (.).

The example is shown below:

 $fileName = 'banner.jpg'; $ext = substr($fileName, strrpos($fileName, '.') + 1); echo $ext; ?>

Use preg_replace

In the framework of this approach, you should apply a regular expression reach and replacement.

 $fileName = 'banner.jpg'; $ext = preg_replace('/^.*\.([^.]+)$/D', '$1', $fileName); echo $ext; ?>

Use pathinfo

And, the final approach that we recommend is to use the PHP pathinfo() function. It is aimed at returning information about the file. In case the second optional parameter is not passed, an associative array will be returned. It will include the dirname, extension, basename, and filename. Once the second parameter is passed, then specific information will be returned.

 $fileName = 'banner.jpg'; $ext = pathinfo($fileName, PATHINFO_EXTENSION); echo $ext; ?>

So, after learning about all the possible ways described above, you are free to choose the best one for you. In our opinion, the simplest, yet the most efficient way among all these options is the pathinfo() function.

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pathinfo

pathinfo() returns information about path : either an associative array or a string, depending on flags .

Note:

For information on retrieving the current path info, read the section on predefined reserved variables.

Note:

pathinfo() operates naively on the input string, and is not aware of the actual filesystem, or path components such as » .. «.

Note:

On Windows systems only, the \ character will be interpreted as a directory separator. On other systems it will be treated like any other character.

pathinfo() is locale aware, so for it to parse a path containing multibyte characters correctly, the matching locale must be set using the setlocale() function.

Parameters

If present, specifies a specific element to be returned; one of PATHINFO_DIRNAME , PATHINFO_BASENAME , PATHINFO_EXTENSION or PATHINFO_FILENAME .

If flags is not specified, returns all available elements.

Return Values

If the flags parameter is not passed, an associative array containing the following elements is returned: dirname , basename , extension (if any), and filename .

Note:

If the path has more than one extension, PATHINFO_EXTENSION returns only the last one and PATHINFO_FILENAME only strips the last one. (see first example below).

Note:

If the path does not have an extension, no extension element will be returned (see second example below).

Note:

If the basename of the path starts with a dot, the following characters are interpreted as extension , and the filename is empty (see third example below).

If flags is present, returns a string containing the requested element.

Examples

Example #1 pathinfo() Example

$path_parts = pathinfo ( ‘/www/htdocs/inc/lib.inc.php’ );

echo $path_parts [ ‘dirname’ ], «\n» ;
echo $path_parts [ ‘basename’ ], «\n» ;
echo $path_parts [ ‘extension’ ], «\n» ;
echo $path_parts [ ‘filename’ ], «\n» ;
?>

The above example will output:

/www/htdocs/inc lib.inc.php php lib.inc

Example #2 pathinfo() example showing difference between null and no extension

$path_parts = pathinfo ( ‘/path/emptyextension.’ );
var_dump ( $path_parts [ ‘extension’ ]);

$path_parts = pathinfo ( ‘/path/noextension’ );
var_dump ( $path_parts [ ‘extension’ ]);
?>

The above example will output something similar to:

string(0) "" Notice: Undefined index: extension in test.php on line 6 NULL

Example #3 pathinfo() example for a dot-file

The above example will output something similar to:

Array ( [dirname] => /some/path [basename] => .test [extension] => test [filename] => )

Example #4 pathinfo() example with array dereferencing

The flags parameter is not a bitmask. Only a single value may be provided. To select only a limited set of parsed values, use array destructuring like so:

[ ‘basename’ => $basename , ‘dirname’ => $dirname ] = pathinfo ( ‘/www/htdocs/inc/lib.inc.php’ );

var_dump ( $basename , $dirname );
?>

The above example will output something similar to:

string(11) "lib.inc.php" string(15) "/www/htdocs/inc"

See Also

• dirname() — Returns a parent directory’s path
• basename() — Returns trailing name component of path
• parse_url() — Parse a URL and return its components
• realpath() — Returns canonicalized absolute pathname

Источник

How to Get a File Extension in PHP

In PHP, there exist various ways of getting a file extension. In our tutorial, we have chosen the 5 best ways that will help you to get a file extension straightforwardly.

Go ahead and choose the one that matches your project better.

Explode a File Variable

The first way is exploding a file variable and getting the last element of the array. That will be a file extension. Here is how you can do it:

 $fileName = 'banner.jpg'; $fileNameParts = explode('.', $fileName); $ext = end($fileNameParts); echo $ext; ?>

Find the Last Occurrence of ‘.’

In the framework of the second approach, we recommend detecting the last occurrence of ‘.’, which will return a ‘.jpg’ . Afterwards, you need to remove the first character of a string using substr. As a result, the exact file extension ‘.jpg’ will be returned.

 $fileName = 'banner.jpg'; $ext = substr(strrchr($fileName, '.'), 1); echo $ext; ?>

Use strrpos

The next way is to use strrpos for detecting the position of the last occurrence of ‘.’ inside a file name, incrementing that position by 1 so that it explodes a string from (.).

The example is shown below:

 $fileName = 'banner.jpg'; $ext = substr($fileName, strrpos($fileName, '.') + 1); echo $ext; ?>

Use preg_replace

In the framework of this approach, you should apply a regular expression reach and replacement.

 $fileName = 'banner.jpg'; $ext = preg_replace('/^.*\.([^.]+)$/D', '$1', $fileName); echo $ext; ?>

Use pathinfo

And, the final approach that we recommend is to use the PHP pathinfo() function. It is aimed at returning information about the file. In case the second optional parameter is not passed, an associative array will be returned. It will include the dirname, extension, basename, and filename. Once the second parameter is passed, then specific information will be returned.

 $fileName = 'banner.jpg'; $ext = pathinfo($fileName, PATHINFO_EXTENSION); echo $ext; ?>

So, after learning about all the possible ways described above, you are free to choose the best one for you. In our opinion, the simplest, yet the most efficient way among all these options is the pathinfo() function.

Источник

Php filename file extension

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