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The PHP print instruction on this object, incidentally, produces the same information as var_dump in a slightly more compact form, all on one line (which we have split into five for readability).
顺便说一下，在此对象上使用PHP print指令将获得与var_dump相同的信息，且格式更为简洁，仅有一行(为可读性起见，本文将其拆分为五行书写)。
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