Function is divided into system function and user-defined function Custom function definition features: Function Requirements for function names: only letters, underscores, and numbers can be used, and numbers cannot be used as initial letters If you have a return value, return the data to be returned with the return keyword.

Filename	Size	Update
函数\hanshu\funtiondemo1.php	711	2017-09-30
函数\hanshu\gongyueshu\2-2.php	299	2017-09-30
函数\hanshu\gongyueshu\gongyuehtml.html	365	2017-09-30
函数\hanshu\gongyueshu
函数\hanshu
函数

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