Get a total from symmetric intigers from array in php? - php

Question

ok so i have array for example $arr= "/43sdsd555ksldk66sd"544fdfd";
I take numbers using preg_match_all '/\d+/', and array_map('intval', $zni[0]);
Now the problem is i need to reverse those whole int to see if they are symmetric,like 555 and 66 , and if they are GET A TOTAL OF THEM.(total of only symmetric numbers)
i tried to use function " strrev "and got symmetric numbers, but i don't know how to put them in a one place IF THEY ARE symmetric and calculate them.
<?php
$numbers = "";
if (isset($_GET['submit']))
{
$numbers = ($_GET['niz']);
preg_match_all('/\d+/', $numbers, $zni);
$numtwo= array_map('intval', $zni[0]);
}
foreach ($numtwo as $num)
{
$reverse = strrev($num);
var_dump($reverse);
if ($num == $reverse)
{
$reverse = "true";
} else {
$reverse = "false";
}
var_dump($reverse);
}

Answer 1

Since you already got most of the way there and all you were missing basically was to use + or +=, here is an easy example on how to do it:
$input = "/43sdsd555ksldk66sd544fdfd";
$total = 0;
preg_match_all('/\d+/', $input, $m);
foreach ($m[0] as $d)
if ($d == strrev($d))
$total += $d;
var_dump($total); // => int(621)
Using intval() is not necessary as PHP will implicitly cast between types as needed.
Alternatively you can replace the loop with PHP's array_* functions:
$input = "/43sdsd555ksldk66sd544fdfd";
preg_match_all('/\d+/', $input, $m);
$total = array_sum(array_filter($m[0], function ($v) { return $v == strrev($v); }));
var_dump($total); // => int(621)
Here we use an anonymous function with array_filter() to generate a new array that only contains palindrome numbers from the original matches which is then given to array_sum().
So all that's needed to transform your original code into a working example, is introducing a variable and summing up:
<?php
$numbers = "";
if (isset($_GET['submit']))
{
$numbers = ($_GET['niz']);
preg_match_all('/\d+/', $numbers, $zni);
$numtwo= array_map('intval', $zni[0]);
}
$total = 0; // new variable
foreach ($numtwo as $num)
{
$reverse = strrev($num);
var_dump($reverse);
if ($num == $reverse)
{
$reverse = "true";
$total += $num; // sum up
} else {
$reverse = "false";
}
var_dump($reverse);
}
var_dump($total); // => int(621)