(PHP 4, PHP 5, PHP 7, PHP 8)
imageinterlace — Enable or disable interlace
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.
imageA GdImage object, returned by one of the image creation functions, such as imagecreatetruecolor().
interlace
If true, the image will be interlaced, if false the interlace bit is turned off.
Passing null will result in the interlacing behavior not being changed.
| Version | Description |
|---|---|
| 8.0.5 | imageinterlace() returns a bool now; previously it returned an int (non-zero for interlaced images, zero otherwise). |
| 8.0.0 |
image expects a GdImage
instance now; previously, a valid gd resource was expected.
|
| 8.0.0 |
enable expects a bool now;
previously it expected an int.
|
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);
?>