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php output string problem

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Release： 2016-09-11 11:34:17
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The value of the variable is a three-digit string. It is normal to output a string. Why is this?
php output string problem

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The value of the variable is a three-digit string. It is normal to output a string. Why is this?
php output string problem

nan, it means it is not a number, please post the code

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