php interview_ci framework_interview question summary

1. Time:

1. Use PHP to print out the time format of the previous day, such as: "2015-01-21 14:42:09"

echo date("Y-m-d H:i:s",strtotime("-1 day"))."
";

2. Use PHP to print out the time format of last week, such as: "2015-01-15 14:42:09"

echo date("Y-m-d H:i:s",strtotime("-1 week"))."
";

3. Use PHP to print out the time format of last month , such as: "2014-12-22 14:42:09"

echo date("Y-m-d H:i:s",strtotime("-1 month"))."
";

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