(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.
image
A 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);
?>