PHP 日期加減

PHP 日期加減
1. mktime()

$date1 = date ("Y-m-d H:i:s" , mktime(date('H'), date('i'), date('s'), date('m'), date('d')-1, date('Y'))); 
$date2 = date ("Y-m-d H:i:s" , mktime(date('H'), date('i'), date('s'), date('m'), date('d'), date('Y')));

2. strtotime()

$today = '2013-04-19';
echo date("Y-m-d", strtotime($today."+3 year"));
echo date("Y-m-d", strtotime($today."-1 month"));
echo date("Y-m-d", strtotime($today."+10 week"));
echo date("Y-m-d", strtotime($today."+10 day"));
echo date("Y-m-d", strtotime($today."+2 hour"));
echo date("Y-m-d", strtotime($today."+20 minute"));
echo date("Y-m-d", strtotime($today."+5 seconds"));
echo date("Y-m-d", strtotime($today."+1 day 5 seconds"));
echo date("Y-m-d", strtotime($today."+1 week -2 day"));

參考資料 :
http://blog.twbryce.com/strtotime-method/

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PHP Function with Optional Parameters

PHP Function with Optional Parameters

有 2 種方法

1. 用 NULL arguments

function method($arg1 = null, $arg2 = null){
  $arg1 = $arg1? $arg1: "default_value_for_arg1";
  $arg2 = $arg2? $arg2: "default_value_for_arg2";
}

2. 傳 Array

function method($arr){
  $arg1 = $arr['$arg1'] ? $arr['$arg1'] : "default_value_for_arg1";
  $arg2 = $arr['$arg2'] ? $arr['$arg2'] : "default_value_for_arg2";
}

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Strict Standards: Only variables should be passed by reference in

升級 PHP 後

會遇到錯誤回報 Strict Standards: Only variables should be passed by reference in 

$SQL->bindParam(':page', getenv('REQUEST_URI'));

看到這報錯後，我變更改成以下

$temp = getenv('REQUEST_URI');
$SQL->bindParam(':page', $temp);

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