php man page for imageinterlace

IMAGEINTERLACE(3)							 1							 IMAGEINTERLACE(3)

imageinterlace - Enable or disable interlace

SYNOPSIS
       int imageinterlace (resource  $image, [int  $interlace])

DESCRIPTION
       imageinterlace(3) turns the interlace bit on or off.

	If the interlace bit is set and the image is used as a JPEG image, the image is created as a progressive JPEG.

PARAMETERS
	      o $
		image -An image resource, returned by one of the image creation functions, such as imagecreatetruecolor(3).

	      o $interlace
		- If non-zero, the image will be interlaced, else the interlace bit is turned off.

RETURN VALUES
	Returns 1 if the interlace bit is set for the image, 0 otherwise.

EXAMPLES
       Example #1

	      Turn on interlacing using imageinterlace(3)

	      <?php
	      // Create an image instance
	      $im = imagecreatefromgif('php.gif');

	      // Enable interlancing
	      imageinterlace($im, true);

	      // Save the interlaced image
	      imagegif($im, './php_interlaced.gif');
	      imagedestroy($im);
	      ?>

PHP Documentation Group 													 IMAGEINTERLACE(3)