計算兩個日期相差幾天

程式碼
	<?php
	function DateDiff($beginDate, $endDate) {
		$_beginDate = strtotime($beginDate);
		$_endDate = strtotime($endDate);
		$_diff = abs($_beginDate-$_endDate);
		return round(($_diff)/3600/24);
	}
	?>
	
使用範例
	<?php
	$a = "2015-12-31";
	$b = "2015-10-31";
	echo "日期a:".$a."\n";
	echo "日期b:".$b."\n";
	echo "兩個日期相差:".DateDiff($a, $b)."天";
	?>
	
執行結果
	日期a:2015-12-31
	日期b:2015-10-31
	兩個日期相差:61天
	

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