Php array addition, I cannot understand. could you give me some good examples?

Php array addition, I cannot understand. could you give me some good examples?

$a ="a";$b ="b";$ay[$a][$b][]= 3;print_r($ay);

Output, Array ([a] => Array ([B] => Array ([0] => 3), indicates whether Array B exists in Array, an array exists in array B. The value of the array index 0 is 3.

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$ Me [$ a] [$ B] + = $ Me [$ k] [$ c]; // What is the value on the left after this addition ??
$ Me [$ z] [$ m] = $ Me [$ sy] [$ my]; // what will happen after this assignment ??

I have a big head for these two sentences. please help me. it is best to write an example to show them to me. my mind is really not very easy ..

I only know the following ..
$ A [] = 1;
$ B [] = 2;
Echo $ a [0] + B [0]; the result is 3.
Also understand
$ A [] = 1;
$ B [] = 2;
Echo $ a [0] = B [0]; result a [0] is 2;

Reply to discussion (solution)

$ Me [$ a] [$ B] + = $ Me [$ k] [$ c]; // What is the value on the left after this addition ??
$ Me [$ z] [$ m] = $ Me [$ sy] [$ my]; // what will happen after this assignment ??


This is a two-dimensional array representation that represents the value of an element. you can use it as a variable:
$ A + = 1;
$ A = 3;
So you can understand it.

$ Me [$ a] [$ B] + = $ Me [$ k] [$ c]; // What is the value on the left after this addition ??
This is short for, equivalent
$ Me [$ a] [$ B] = $ Me [$ a] [$ B] + $ Me [$ k] [$ c];
Equivalent
$ A = $ a + $ B;

$ Me [$ z] [$ m] = $ Me [$ sy] [$ my]; // what will happen after this assignment ??
$ Me [$ z] [$ m] and $ Me [$ sy] [$ my] both store a value.
Assume that $ Me [$ z] [$ m] stores 1 and $ Me [$ sy] [$ my] stores 2 values.
Then echo $ Me [$ z] [$ m] = $ Me [$ sy] [$ my];
The result is that $ Me [$ z] [$ m] is 2.

Php array () is a multi-dimensional array,
The value of one dimension is: array []
The two-dimensional value is: array [] []
And so on.
Returns the dimension of the array.

/*** Return the array dimension * @ param [type] $ arr [description] * @ return [type] [description] */function arrayLevel ($ arr) {$ al = array (0); function aL ($ arr, & $ al, $ level = 0) {if (is_array ($ arr) {$ level ++; $ al [] = $ level; foreach ($ arr as $ v) {aL ($ v, $ al, $ level) ;}} aL ($ arr, $ al); return max ($ al) ;}$ arr = array ('0' => '0',); echo arrayLevel ($ arr );

It is recommended to use the function array_merge () http://www.w3school.com.cn/php/func_array_merge.asp of php array to merge arrays

More hands-on, less eye-catching, remember to give your mind some oil

$Me = array(  array(1, 2, 3, 4),  array(4, 6, 7, 8),  array(9, 10, 11, 12),  array(13, 14, 15, 16),);$a = 0;$b = 1;$k = 2;$c = 3;$z = 3;$m = 3;$sy = 1;$my = 2;$Me[$a][$b] += $Me[$k][$c];$Me[$z][$m] = $Me[$sy][$my];print_r($Me);

Thank you!