https://www.cnblogs.com/wuhuan666/p/8472911.html
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echo date("Y-m-d H:i:s",time()) ;
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echo date("Y-m-d H:i:s",time());
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echo strtotime("next Thursday");
echo date("Y-m-d H:i:s",time());
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echo strtotime("last Thursday");
echo date("Y-m-d H:i:s",time());