如何更深入的多维数组索引？ [关闭]

Question

Code:

$a = array();
$a[] = 'a';
$a[] = 'b';
$a[] = 'c';
$a[] = array('e', 'f', array('g', '3'), 'c');
$a[] = 'd';

this works fine:

return $a[3][2][1];

it gives "3". But what if I need to do it with programmatically? A searching or something?

Answer 1

You could use array_walk_recursive to go through each element of the array including array elements, but you might be better off using an OOP approach and making objects of the items (and possibly hilding an array inside them) which would make it much more intuitive.

Example of array_walk_recursive:

<?php
$sweet = array('a' => 'apple', 'b' => 'banana');
$fruits = array('sweet' => $sweet, 'sour' => 'lemon');

function test_print($item, $key)
{
    echo "$key holds $item
";
}

array_walk_recursive($fruits, 'test_print');
?>

output:

a holds apple
b holds banana
sour holds lemon

An example of a class would be as follows:

class mySubArray
{
    public $element1='e';
    public $element2='f';
    public $element3=array();
    public $element4='c';
}

class mySomething
{
    public $var1='a';
    public $var2='b';
    public $var3='c';
    public $var4=array();
    public $var5='d';

    public function __construct()
    {
        $this->var4= new mySubArray();
        $this->var4->element3[0]='g';
        $this->var4->element3[0]='3';
    }
}

$myObject = new mySomething();

Then you can access the properties as follows:

echo $myObject->var3; // Output: c
echo $myObject->var4->element2; // output: f