第一个星期二PHP [英] First Tuesday PHP

问题描述

first_tuesday（）函数应返回一年中第一个星期二的日期，但尤其是在2011年的情况下，它返回错误的值。如何修复代码以使其在所有情况下均有效

The first_tuesday() function should return the date of the first Tuesday of year, but especially in the case of 2011 it returns a wrong value. how to Fix the code so it works in all cases

function first_tuesday($year){

    $first_january = mktime(0,0,0,1,1,$year);
    $day_week = date("w",$first_january );
    $first_tuesday = $first_jan + ((2 - $day_week) % 7)* 86400;
    return date("d/m/Y",$first_tuesday);
}

推荐答案

使用 DateTime 类：

function first_tuesday($year){
    $day = new DateTime(sprintf("First Tuesday of January %s", $year));
    return $day->format('d/m/Y');
}

用法：

echo first_tuesday(2011);

输出：

04/01/2011

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