PHP 4, PHP 5, PHP 7, PHP 8
imageinterlace - Enable or disable interlace
Code Examples

imageinterlace( GdImage$image, [bool|null$enable = null] ): bool

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.



A GdImage object, returned by one of the image creation functions, such as imagecreatetruecolor.


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.

Return Values

Returns true if the interlace bit is set for the image, false otherwise.


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.

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Function imageinterlace:

Image Processing and GD Functions

Most used PHP functions