imageinterlace
(PHP 4, PHP 5, PHP 7)
imageinterlace — Enable or disable interlace
Description
imageinterlace ( resource $image [, int $interlace = 0 ] ) : int imageinterlace() 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
-
image -
An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().
-
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()
<?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);
?>
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https://www.php.net/manual/en/function.imageinterlace.php