Can someone help me with some code or instructions on how to walk recursively an array and when reaching the last element print the full path to it? A simple echo will work because I will adapt the code to some other function I'm developing.
The function doesn't need to figure the array dimension because this param will be passed:
Example:
$depth = 8;
$array[1][3][5][6][9][5][8][9];
When function reachs the 8th element it print all the path to it:
//print path
'1 -> 3 -> 5 -> 6 -> 9 -> 5 -> 8 -> 9'
As I said, only printing in this format will work cause I will implement the code into some other function.
array keys can have the same value. Obviously not the same value in the same sequence for the entire arary.
Updated:
Walk recursively function:
$someArray[1][2][3] = 'end';
$someArray[1][2][6] = 'end';
$someArray[1][3][6] = 'end';
$someArray[4][3][7] = 'end';
function listArrayRecursive(&$array_name, $ident = 0){
if (is_array($array_name)){
foreach ($array_name as $k => &$v){
if (is_array($v)){
for ($i=0; $i < $ident * 10; $i++){ echo " "; }
echo $k . " : " . "<br>";
listArrayRecursive($v, $ident + 1);
}else{
for ($i=0; $i < $ident * 10; $i++){ echo " "; }
echo $k . " : " . $v . "<br>";
}
}
}else{
echo "Variable = " . $array_name;
}
}
listArrayRecursive($someArray);
Will print:
1 :
2 :
3 : end
6 : end
3 :
6 : end
4 :
3 :
7 : end
Now, how can I also print the path of the array everytime it reaches the end? For example:
1 :
2 :
3 : end : path -> 1,2,3
6 : end : path -> 1,2,6
3 :
6 : end : path -> 1,3,6
4 :
3 :
7 : end : path -> 4,3,7
EDITED CODE ADDING A THIRD PARAM TO RECORD THE PATH:
$someArray[1][2][3] = 'end';
$someArray[1][2][6] = 'end';
$someArray[1][3][6] = 'end';
$someArray[4][3][7] = 'end';
$someArray[3][2] = 'end';
function listArrayRecursive(&$array_name, $ident = 0, $path = null){
foreach ($array_name as $k => &$v){
if (is_array($v)){
for ($i=0; $i < $ident * 10; $i++){ echo " "; }
echo $k . " : " . "<br>";
$path .= $k . ', ';
listArrayRecursive($v, $ident + 1, $path);
}else{
for ($i=0; $i < $ident * 10; $i++){ echo " "; }
echo $k . " : " . $v . ' - path -> ' . $path . "<br>";
}
}
}
listArrayRecursive($someArray);
Will print:
1 :
2 :
3 : end - path -> 1, 2,
6 : end - path -> 1, 2,
3 :
6 : end - path -> 1, 2, 3,
4 :
3 :
7 : end - path -> 1, 4, 3,
3 :
2 : end - path -> 1, 4, 3,
You could employ a RecursiveIteratorIterator
(docs) to take the hard work out of recursing through the arrays.
function listArrayRecursive($someArray) {
$iterator = new RecursiveIteratorIterator(new RecursiveArrayIterator($someArray), RecursiveIteratorIterator::SELF_FIRST);
foreach ($iterator as $k => $v) {
$indent = str_repeat(' ', 10 * $iterator->getDepth());
// Not at end: show key only
if ($iterator->hasChildren()) {
echo "$indent$k :<br>";
// At end: show key, value and path
} else {
for ($p = array(), $i = 0, $z = $iterator->getDepth(); $i <= $z; $i++) {
$p[] = $iterator->getSubIterator($i)->key();
}
$path = implode(',', $p);
echo "$indent$k : $v : path -> $path<br>";
}
}
}
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