How does PHP use the date () function to determine whether a specified year is a leap year?

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Description

1. The t-character parameter of the date () function can be used to get the number of days contained in a given month.

2. Many characters are built into this function to control the format of the output date string.

In fact, there is a character "L" that can be used to determine whether it is a leap year (1 if it is a leap year, otherwise 0).

Example

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