求大神指点，php中print、print_r、echo三者有什么区别啊？

Answer 1

Please give me some advice, what is the difference between print, print_r and echo in php? -PHP Chinese website Q&A-Please give me some advice. What are the differences between print, print_r, and echo in PHP? -PHP Chinese website Q&A

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Answer 2

echo是PHP语句, print和print_r是函数,语句没有返回值,函数可以有返回值
print（）      只能打印出简单类型变量的值(如int,string) 
print_r（） 可以打印出复杂类型变量的值(如数组,对象) 
echo        输出一个或者多个字符串