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php如何把1显示成01的格式

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Release： 2016-06-13 11:10:47
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php怎么把1显示成01的格式
那个函数是什么？记不清楚了。
1-60的数字循环，但是希望是01-60这样的格式


------解决方案--------------------
str_pad
Related labels：
php str
source：php.cn
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