[PHP]Converting RGB or HEX To “Long Int” Color

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Need to convert RGB or HEX colors to "Long Int" for another program that uses this format. Not sure the specifics of the "Long Int" color format though.It is possible to generate the "Long Int" values manually using this color-picker http://hide-inoki.com/en/soft/chunter/index.html but a php function would be preferred.hexdec generates the correct "Long Int" for some HEX values ('FFFFFF', '2F2F2F') but not others ('123456').