   #PHP Manual Image functions imagegif imageistruecolor

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                                imageinterlace

   (PHP 3, PHP 4 )
   imageinterlace -- Enable or disable interlace

Description

   int imageinterlace ( resource image [, int interlace])

   imageinterlace() turns the interlace bit on or off. If interlace is 1
   the image will be interlaced, and if interlace is 0 the interlace bit
   is turned off.

   If the interlace bit is set and the image is used as a JPEG image, the
   image is created as a progressive JPEG.

   This function returns whether the interlace bit is set for the image.
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