How to traverse a multidimensional array in php

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1. Concept

A multidimensional array is an array that contains one or more arrays.

A multidimensional array of two, three, four, or five or more levels.

A two-digit array requires two indexes to select elements.

A three-dimensional array requires three indexes to select elements.

two。 Be careful

(1) No matter how complex the array is, the outermost array array () must be followed by a semicolon!

(2) if there are several juxtaposed elements at the same level, all elements must be added a comma at the end except for the last element of the array.

3. Traversing an instance

Function arr_fun ($arr) {if (is_array ($arr)) {foreach ($arr as $v) {if (is_array ($v)) {arr_fun ($v);} else {echo $v. "

";} else {echo $arr."

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