Returns the array dimension (number of layers)-PHP source code.

Returns an array dimension (number of layers) call.

$arr = array(array(1,2=>array(1,2,3)),2=>array(1=>array(array(array())),2),3);echo GetArrLv($arr);

For example, if implode is a multi-dimensional array, an error is returned. of course, we can use an array similar to array_search (true, array_map ('is _ array', $ arr )) this method is used to determine whether it is 2-dimension + (for example, please Hold the performance control ).

Next, we use print_r as the media.

/*** Returns the array dimension (level) * @ author echo * @ param array $ arr * @ return int */function GetArrLv ($ arr) {if (is_array ($ arr) {# recursively set all values to NULL. Objective 1. eliminate fictitious layers such as array ("array (\ n ()"), 2. print_r output is lightweight. array_walk_recursive ($ arr, function (& $ val) {$ val = NULL ;}); $ ma = array (); # Match [blank] from the beginning of the line to the first left brace, enable the multi-line switch 'M' preg _ match_all ("'^ \ (| ^ \ s + \ ('m", print_r ($ arr, true), $ ma ); # callback to string length // $ arr_size = array_map ('strlen', current ($ ma )); # Remove the maximum length and the length occupied by the left parenthesis. // $ max_size = max ($ arr_size)-1; # The array layer spacing should be 8 space columns, here we need to add 1 because the first layer of left brackets printed by print_r are at the beginning of the row/return $ max_size/8 + 1; return (max (array_map ('strlen ', current ($ ma)-1)/8 + 1;} else {return 0 ;}}

2.Call it

$arr = array(array(1,2=>array(1,2,3)),2=>array(1=>array(array(array())),2),3);echo GetArrLv($arr);

The preceding figure shows the returned array dimension (number of layers). For more information, see PHP Chinese website (www.php1.cn )!