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(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);
?>