PHP-005- [array] - multi-dimensional arrays

Learning Points

• 1. Define a multidimensional array
• 2. iterate a multidimensional array
• 3. The individual elements of a multidimensional array reference
• 4.unset delete an element
   

<?php
//1.定义一个多维数组
$more=array(
"one"=>array(1,2,3),
"two"=>array("a","b","c")
);

//2.遍历多维数组
foreach ($more as $arrays) 
{
	//外面的循环，每次循环出一个数组对象出来
	foreach ($arrays as $key=>$value) 
	{
		//内层开始循环出每个数组元素
	  echo $key.'--'.$value."<br />"	;
	};
}
echo '<hr />';

//3.多维数组单个元素的引用
echo $more["one"][0];
echo $more["one"][1];
echo $more["one"][2];
echo $more["one"][3];//引用不存在的元素 Undefined offset  

echo '<hr />';

//4.删除一个元素
unset($more["one"][0]);
print_r($more);

/*
 Array ( 
 [one] => Array ( [1] => 2 [2] => 3 )
 [two] => Array ( [0] => a [1] => b [2] => c ) 
 )
 */
?>