Numeric multidimensional array php - php

Question

I have this numeric multidimensional array in php. It's Playfair matrix and I want to get the keys of a letter from the matrix.
Let's say I have the letter "P", which is on the third row(0 to 4) and second column(0 to 4). I have tried several things array_keys(not working as I want it to), functions to get the key of the first level of the array, making the array one dimensional and doing some magic tricks...Nothing works and I would like some help.
This is the function that gets the keys of the first level:
function array_search2($needle, $haystack){
$l = count($haystack);
for ($i=0; $i < $l; $i++) {
if (in_array($needle, $haystack[$i])) return $i;
}
return false;
}
I want to have this array with letters, to get two letters from it, to get these two letters their coordinates(from the PLayfair matrix) and to comprate their rows/columns.
Thank you and I'll post any code that is needed.
Edit : I'm posting all I have:
$keyword = str_replace(' ','', $_POST['keyword']);
$plaintext = str_replace(' ','', $_POST['plaintext']);
$key = str_split($keyword); //string to array
$plain = str_split($plaintext); //string to array
$alphabet = array(
0 => 'a', 1 => 'b', 2 => 'c', 3 => 'd', 4 => 'e', 5 => 'f',
6 => 'g', 7=> 'h', 8 => 'i', 9 => 'j', 10 => 'k', 11 => 'l',
12 => 'm', 13 => 'n', 14 => 'o', 15 => 'p', 16 => 'q', 17 => 'r',
18 => 's', 19 => 't', 20 => 'u', 21 => 'v', 22 => 'w', 23 => 'x',
24 => 'y');
for ($i=0; $i < count($key); $i++) {
for ($j=0; $j < count($alphabet) ; $j++) {
if ($keyword[$i] == $alphabet[$j]) {
unset($alphabet[$j]);
}
}
}
$keywordFilpped = array_flip($key);
$alphabetFlipped = array_flip($alphabet);
$mergedFlipped = $keywordFilpped + $alphabetFlipped;
$i = 0;
foreach ($mergedFlipped as $key => $value) {
$mergedFlipped[$key] = $i;
$i++;
}
$merged = array_flip($mergedFlipped);
$index = 0;
for ($i=0; $i < 5; $i++) {
for ($j=0; $j < 5; $j++) {
$matrix[$i][$j] = $merged[$index];
$index++;
}
}
echo "PLAYFAIR MATRIX:<br>";
for ($i=0; $i < 5; $i++) {
for ($j=0; $j < 5; $j++) {
echo $matrix[$i][$j];
}
echo "<br>";
}

Answer 1

if you have a matrix should check with 2 for like following code:
for($i = 1; $i <= 11; $i++)
{
for($j = 1; $j <= 11; $j++)
{
if($array[$i][$j] == 'p') echo "row=$i and col = $j";
}
}
in the above example i check all rows and rows cols
use from this function
function array_search2($needle, $haystack){
$i = 0;
foreach($haystack as $key => $value)
{
$j = 0;
foreach($value as $key2 => $value2)
{
if($value2 == $needle)
return array($i, $j);
$j++;
}
$i++;
}
return false;
}
this function will return an array contain row and col of found status or false;
i tested with following data:
$array = array( 0 => array(0 => 'a', 1=> 'b'), 1 => array(0 => 'c', 1=> 'd'));
print_r(array_search2('d', $array));
// out put Array ( [0] => 1 [1] => 1 )

Answer 2

I've improved your function, which will return keys if match found, irrespective of depth, See example below:
function getArrayKeys($needle, $haystack, $depth = 0) {
$keys = array();
foreach($haystack as $key => $value) {
if(is_array($value)){
$result = getArrayKeys($needle, $value, $depth + 1);
if(!empty($result) || $result === 0) {
if (is_array($result)) {
$keys = array_merge($keys, $result);
} else {
$keys[] = $result;
}
$keys[] = $key;
}
if(!empty($keys) && $depth > 0)
return $keys;
} elseif($value == $needle) {
return $key;
}
}
return !empty($keys) ? array_reverse($keys) : false;
}
$arr = array(
array('A', 'B', 'C'),
array('D', 'F', 'E'),
array('Z', 'Y', 'X'),
array('f' => '44', 'g' => array('99'))
);
$keys = getArrayKeys('99', $arr);
Output:
Array
(
[0] => 3
[1] => g
[2] => 0
)
See it running: https://eval.in/571698