imageinterlace
(PHP 4, PHP 5, PHP 7, PHP 8)
imageinterlace — Enable or disable interlace
Description
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 -
A GdImage object, returned by one of the image creation functions, such as imagecreatetruecolor().
-
interlace -
If
true, the image will be interlaced, iffalsethe interlace bit is turned off. Passingnullwill result in the interlacing behavior not being changed.
Return Values
Returns true if the interlace bit is set for the image, false otherwise.
Changelog
| 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 resource was expected.
|
| 8.0.0 |
enable expects a bool now;
previously it expected an int.
|
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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