Multi-level marketing (MLM), (also called network marketing, direct selling, and referral marketing,) is a term that describes a marketing structure used by some companies as part of their overall marketing strategy. The structure is designed to create a marketing and sales force by compensating promoters of company products not only for sales they personally generate, but also for the sales of other promoters they PHPintroduce to the company, creating a downline of distributors and a hierarchy of multiple levels of compensation(Source: WIKI).
Complete Multilevel marketing website script in PHP with a nice MLM TREE . Here are the screen shots of the same. Try to develop one like this.Full source code for commercial use is also available. If need that please contact us.