getimagesize
image_type_to_mime_type
GD and Image Functions
PHP Manual

# image_type_to_extension

(PHP 5)

image_type_to_extension — Get file extension for image type

### Descripción

string image_type_to_extension ( int `$imagetype` [, bool `$include_dot` ] )

Returns the extension for the given IMAGETYPE_XXX constant.

### Lista de parámetros

`imagetype`

  One of the IMAGETYPE_XXX constant.

`include_dot`

  Whether to prepend a dot to the extension or not. Default to `TRUE`.

### Valores retornados

A string with the extension corresponding to the given image type.

### Ejemplos

Example #1 image_type_to_extension() example

`<?php
// Create image instance
$im = imagecreatetruecolor(100, 100);
// Save image
imagepng($im, './test' . image_type_to_extension(IMAGETYPE_PNG));
imagedestroy($im);
?>`

### Notes

> Note: This function does not require the GD image library.

getimagesize
image_type_to_mime_type
GD and Image Functions
PHP Manual