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array数组学习第四课-php学习第x+3课
虎哥的学习日志
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echo 只能输出标量，一个值，不能输出数组和对象

print_r()格式化输出值，加参数true,输出到字符串

var_dump()输出类型和值，可以输出更多信息

通常使用print_r()即可满足，有时需要使用var_dump（）

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