What is the use of the function ‘imagetypes()’ in PHP?

Answer 1

use imagetypes() function to check which image types are supported.This function returns a bit field which returns a bit field you can use bitwise AND operator to check if a given bit is set.Constants IMG_JPG,IMG_GIF ,IMG_PNG correspond to the bit for image formats.
Example of a code segment ;

  <?php 
      $image=imagecreate(200,200);
      $white=imagecolorallocate($image,0xFF,0XFF,0XFF);
      $black=imagecolorallocate($image,0X00,0X00,0X00);
      imagefieldrectangle=($image,50,50,150,150,$black);
     if(imagetypes() &IMG_PNG)
     {
      header("Content-Type:image/png)
     imagepng($image);
     } elseif
    { 
     //same for other formats
    }
   ?>

Answer 2

imagetypes() function to check which image types are supported.

Syntax

int imagetypes ( void )
Returns the image types supported by the current PHP installation.
Returns a bit-field corresponding to the image formats supported by the version of GD linked into PHP. 
The following bits are returned, IMG_GIF | IMG_JPG | IMG_PNG | IMG_WBMP | IMG_XPM.

Example # Checking for PNG support

<?php
if (imagetypes() & IMG_PNG) {
    echo "PNG Support is enabled";
}
?>