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imagecolortransparent

Define a color as transparent (PHP 4, PHP 5)
int imagecolortransparent ( resource image [, int color] )

Sets the transparent color in the given image.

Parameters

image

An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().

color

A color identifier created with imagecolorallocate()

Return Values

The identifier of the new (or current, if none is specified) transparent color is returned.

Notes

Note:

Transparency is copied only with imagecopymerge() and true color images, not with imagecopy() or pallete images.

Note:

The transparent color is a property of the image, transparency is not a property of the color. Once you have set a color to be the transparent color, any regions of the image in that color that were drawn previously will be transparent.