How to enable or disable interlace using imageinterlace() function in PHP?

PHPServer Side ProgrammingProgramming

imageinterlace() is an inbuilt PHP function that is used to enable or disable interlace in an image. It is a method of encoding a bitmap image such that a person who has partially received it sees a degraded copy of the entire image.

Interlacing an image lets users see portions of it as it loads, and it takes different forms depending on the image type. The non-interlaced JPEGs appear line-by-line. To enable interlacing on picture, we can simply call this function with the second parameter set to 1, or set to 0 (zero) to disable it.

Syntax

int imageinterlace(resource $image, int $interlace)

Parameters

imageinterlace() takes two parameters: $image and $interlace.

  • $image − Specifies the image to be interlaced.

  • $interlace − Specifies whether to enable or disable interlacing.

Return Values

imageinterlace() returns 1 if the interlace bit is set for the image, else it returns 0.

Example 1

<?php
   //load an image by using imagecreatefromjpeg() function
   $img = imagecreatefromjpeg('C:\xampp\htdocs\test\30.jpg');
   // Enable interlacing by using one
   imageinterlace($img, 1);

   // View the output image
   header('Content-type: image/jpeg');
   imagejpeg($img);
   imagedestroy($img);
?>


Example 2

In this example, we have disabled interlacing.

<?php
   //load an image by using imagecreatefromjpeg() function
   $img = imagecreatefromjpeg('C:\xampp\htdocs\test\30.jpg');

   // Disable interlacing by using zero
   imageinterlace($img, 0);

   // View the output image
   header('Content-type: image/jpeg');
   imagejpeg($img);
   imagedestroy($img);
?>

Output

raja
Published on 09-Aug-2021 13:44:09
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