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PHP | imageinterlace() Function

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The imageinterlace() function is an inbuilt function in PHP which is used to enable or disable interlace in an image. Interlacing (also known as interleaving) 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. One difference between interlaced and non-interlaced images on a website is that the former one is loaded in a low-quality version first and then it’s quality keeps improving as the website loads whereas a non-interlaced image is loaded in a fixed quality line by line from top to bottom when the website loads.

Syntax:

int imageinterlace( resource $image, int $interlace )

Parameters: This function accepts two parameters as mentioned above and described below:

  • $image: It specifies the image to be interlaced.
  • $interlace: It specifies whether to enable or disable interlacing.

Return Value: This function returns 1 if the interlace bit is set for the image, otherwise 0.

Below examples illustrate the imageinterlace() function in PHP:

Program 1: In this example we will enable interlacing.




<?php
  
// Create an image from URL
$im = imagecreatefrompng(
  
// Enable interlacing
imageinterlace($im, 1);
  
// View the output
header('Content-type: image/jpeg');
imagejpeg($im);
imagedestroy($im);
?>


Output:

Program 2: In this example we will disable interlacing.




<?php
  
// Create an image from URL
$im = imagecreatefrompng(
  
// Disable interlacing
imageinterlace($im, 0);
  
// View the output
header('Content-type: image/jpeg');
imagejpeg($im);
imagedestroy($im);
?>


Output:

Reference: https://www.php.net/manual/en/function.imageinterlace.php



Last Updated : 30 Jan, 2020
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