phpcheatsheets.com
网站标题：	PHP Cheatsheets
网站简介：	Extended PHP Cheat sheets for variable comparisons and variable type testing.
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coolmath.com
网站标题：	Cool Math - free online cool math lessons, cool math games & apps, fun math activities, pre-alge
网站简介：	Cool Math has free online cool math lessons, cool math games and fun math activities. Really clear math lessons (pre-algebra, algebra, precalculus), cool math games, online graphing calculators, geometry art, fractals, polyhedra, parents and teachers areas too.
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