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for spot, c1 should be a spot color handles returned by pdf_makespotcolor() and c2 is a tint value between 0 and 1.
/ / set fill and stroke colors to white. pdf_setcolor( $pdf, "both", "cmyk", 0, 0, 0, 1);
mail() automatically mails the message specified in message to the receiver specified in to. multiple recipients can be specified by putting a comma between each address in to.
this is accomplished via mime-encoding - for more information, see this zend article or the pear mime classes.