Array concatenation of index in php - php

Question

i have following array format in php:
Array
(
[item] => Array
(
[0] => RSJ Pole 116 x100 ,11 Mtr
[1] => RSJ Pole 116 x100 ,10 Mtr
[2] => RSJ Pole 116 x 100, 9 Mtr
[3] => RSJ Pole 116 x 100, 8 Mtr
[4] => Line Length in Kms
[5] => RSJ 125x70, 9 m long
[6] => PSC Pole 9 Mtr
[7] => PSC Pole 8 Mtr
[8] => Conductor ACSR Dog 0.1
[9] => Conductor ACSR Rabbit 55 Sq.mm
[10] => Conductor ACSR Raccon 80 Sq.mm
[11] => Conductor Weisel 34 Sq.mm
[12] => Conductor Ant
[13] => Conductor Gnat
[14] => New DTC 100 KVA
[15] => New DTC 63 KVA
[16] => BPL Connection
[17] => SDT
)
[scope] => Array
(
[0] => 1172
[1] => 6637
[2] => 854
[3] => 4
[4] => 653.71
[5] => 558.9
[6] => 5864
[7] => 820
[8] => 745385
[9] => 1188772.2
[10] => 327600
[11] => 18900
[12] => 232015.9
[13] => 70634.3
[14] => 344
[15] => 54
[16] => 13632
[17] => 37
)
[till] => Array
(
[0] => 3
[1] => 4
[2] => 4
[3] => 6
[4] => 5
[5] => 5
[6] => 5
[7] => 5
[8] => 2
[9] => 5
[10] => 5
[11] => 5
[12] => 5
[13] => 5
[14] => 5
[15] => 5
[16] => 5
[17] => 2
)
[value] => Array
(
[0] => 4
[1] => 7
[2] => 1
[3] => 2
[4] =>
[5] =>
[6] =>
[7] =>
[8] =>
[9] =>
[10] =>
[11] =>
[12] =>
[13] =>
[14] =>
[15] =>
[16] =>
[17] =>
)
[submit] => submit
)
i want to concatenate with "_" operator before submitting or while inserting into database field for eg. 1172_3_4

Answer 1

You can array_map the 3 arrays
$arr = .... //Your array here
$results = array_map(function($s, $t, $v) {
return $s . "_" . $t . "_" . $v;
}, $arr['scope'], $arr['till'], $arr['value']);
echo "<pre>";
print_r( $results );
echo "</pre>";
$results will have the value:
Array
(
[0] => 1172_3_4
[1] => 6637_4_7
[2] => 854_4_1
[3] => 4_6_2
[4] => 653.71_5_
[5] => 558.9_5_
[6] => 5864_5_
[7] => 820_5_
[8] => 745385_2_
[9] => 1188772.2_5_
[10] => 327600_5_
[11] => 18900_5_
[12] => 232015.9_5_
[13] => 70634.3_5_
[14] => 344_5_
[15] => 54_5_
[16] => 13632_5_
[17] => 37_2_
)
Doc: array_map()

Answer 2

Implement the loop at main array and increment in $i then concatenate $array_variable['scope'][$i].'_'.$array_variable['till'][$i].'_'.$array_variable['value'][$i].