PHP determines whether the date is legal

Use strtotime() function to judge:

/**
 * 校验日期格式是否正确
 *
 * @param string $date 日期
 * @param string $formats 需要检验的格式数组
 * @return boolean
 */
function checkDateIsValid($date, $formats = array("Y-m-d", "Y/m/d")) {
    $unixTime = strtotime($date);
    if (!$unixTime) { //strtotime转换不对，日期格式显然不对。
        return false;
    }
    //校验日期的有效性，只要满足其中一个格式就OK
    foreach ($formats as $format) {
        if (date($format, $unixTime) == $date) {
            return true;
        }
    }

    return false;
}

One thing to note: If the required date format is special, even if it is correct If the format cannot be parsed by the strtotime function, this function cannot be used, but this situation should be very rare.

Example:

var_dump(checkDateIsValid("2013-09-10")); //输出true
var_dump(checkDateIsValid("2013-09-ha")); //输出false
var_dump(checkDateIsValid("2012-02-29")); //输出true
var_dump(checkDateIsValid("2013-02-29")); //输出false

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