php数组函数大全|php数组长度函数的例子

PHP中有两个内建的函数：count() 和sizeof()，可以实现得到数组的长度
 
$colorList = array("apple"=>"red", "grass"=>"green", "sky"=>"blue",  "night"=>"black","wall"=>"white"); 

echo "Array size with count: ".count($colorList); 

echo "Array size with count: ".sizeof($colorList); 

例子

$arr = Array("0","1","2","3","4");
echo count($arr);
// 输出 5
$arr = array("A","B","C");
echo sizeof($arr);
//输出3

二维数组：

count函数有两个参数：
0(或COUNT_NORMAL)为默认,不检测多维数组(数组中的数组);
1(或COUNT_RECURSIVE)为检测多维数组，

你可以使用这样的代码来测试该函数：

$arr=array(
                 0=>array("title" => "新闻1", "viewnum" => 123, "content" => "ZAQXSWedcrfv"),
                 1=>array("title" => "新闻2", "viewnum" => 99, "content" => "QWERTYUIOPZXCVBNM")
               );
echo "不统计多维数组：".count($arr,0);//count($arr,COUNT_NORMAL)
echo "
";
echo "统计多维数组：".count($arr,1);//count($arr,COUNT_RECURSIVE)
?>

php数组函数大全|php数组长度函数的例子

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