Map 2 Arrays to produce a desired string

So i have two arrays and i want to map 0th key of first array with 0th key of second array and both array could have n number of keys ,so that the final Result which would be a string should look something like mentioned below

Array
(
[0] => 1
[1] => 2
)

Array
(
[0] => 5
[1] => 10
)


Result--

1:5,2:10


i tried this--
which gives output

:1:5,1:10,2:5,2:10,


4 Answers
4

A bit verbose but will handle if both input arrays are 2 different lengths.

<?php

$array_one = [1,2];
$array_two = [5,10];

// Array we work with to push the merged data too,
$array_result = ;

foreach($array_one as $index => $value)

$array_result[$index] = $value;



foreach($array_two as $index => $value)

// If the first number was set from the $array_one iteration then concatenate ':' and this $array_two_value, else simply add this $array_two_value.
if(isset($array_result[$index]))
$array_result[$index] .= ':' . $value;

else
$array_result[$index] .= $value;




echo implode(',',$array_result);


Use array_map and implode:

// Function which concats two given strings with ':' and returns
function concatValues($v1,$v2)

return($v1.':'.$v2);


// Input arrays
$first_input_array = Array ( [0] => 1 [1] => 2 );
$second_input_array = Array ( [0] => 5 [1] => 10 );

// array_map to concat corresponding values from the two input arrays
$output = array_map('concatValues',
array_values($first_input_array),
array_values($second_input_array)
);

// Implode to get comma separated string
$output = implode(',', $output);


To map it into another array, you can do it like this:

<?php
$a1 = [1,2,3,4,5];

$a2 = [5,4,3,2,1];

$a3 = ;

foreach($a1 as $k => $v)

$a3[$v] = null;

if(array_key_exists($k, $a2))
$a3[$v] = $a2[$k];



print_r($a3);


it get the requested string you may do it like this:

<?php
$a1 = [1,2,3,4,5];

$a2 = [5,4,3,2,1];

$a3 = ;

foreach($a1 as $k => $v)

if(array_key_exists($k, $a2))
$a3 = $v . ':' . $a2[$k];



echo implode(',', $a3);


You are nesting loops which is not what you want to do here.

I will assume that both arrays have the same number of elements so that we can make a simple solution.

$output = '';
if ( count($a1) == count($a2) )
foreach ( $a1 as $i => $val1 )
// put the comma if this is not the first one
if ( $i > 0 ) $output .= ',';
$output .= "$val:$a2[$i]";


echo $output;


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