imageinterlace

Enable or disable interlace

&reftitle.description; `int` `imageinterlace` `resource` `image` `int` `interlace` 0

`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.

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&gd.image.description;

`interlace`

- If non-zero, the image will be interlaced, else the interlace bit is turned off.

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Returns 1 if the interlace bit is set for the image, 0 otherwise.

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### 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);
    ?>