How to concatenate an array with a 'foreach' loop? - php

Question

I have several arrays.
example:
$a = Array(
[0] => #ID_1
[1] => #ID_2
[2] => #ID_3
)
$b = Array(
[0] => ABC
[1] => cde
[2] => fgh
)
$c = Array(
[0] => 000
[1] => 111
[2] => 222
)
How to concatenate these data fields using any foreach, for, while loop?
Expected result:
$result = '#ID_1 ABC 000';
I try something like this:
$result = '';
foreach($a as $aa) {
$result .= $aa ." ";
foreach ($b as $bb) {
$result .= $bb ." ";
foreach($c as $cc) {
$result .= $cc .'<br>';
}
}
}
but the result did not meet expectations.
Can anyone advise how to use foreach to chain these arrays together? Thank you. Thank you very much.

Answer 1

If you need foreach loop then use next code:
$res = [];
foreach($a as $ind=>$val){
$res[$ind] = $val." ".$b[$ind]." ".$c[$ind];
}
Demo

Answer 2

You can do something like this.
$arr1 = ["#ID_1", "#ID_2", "#ID_3"];
$arr2 = ["ABC", "DEF", "FGH"];
$arr3 = ["000", "111", "222"];
$arrayLength = count($arr1);
$i = 0;
$result = [];
while ($i < $arrayLength)
{
$result[] = $arr1[$i]." ".$arr2[$i]." ".$arr3[$i];
$i++;
}
foreach($result as $item){
echo $item."<br/>";
}

Answer 3

According to what you're asking, you want to join elements with the key 0 from all arrays, then with the key 1 and so on, so instead of doing a foreach loop you could use a for loop using the key:
<?php
$a = Array(
0 => "#ID_1",
1 => "#ID_2",
2 => "#ID_3",
);
$b = Array(
0 => "ABC",
1 => "cde",
2 => "fgh"
);
$c = Array(
0 => 000,
1 => 111,
2 => 222
);
$length = sizeof($a);
$output = '';
for($i = 0; $i<$length; $i++) {
$output .= $a[$i] . ' / ' . $b[$i] . ' / ' . $c[$i] . '<br>';
}
echo $output;
?>
Outputs:
#ID_1 / ABC / 0
#ID_2 / cde / 111
#ID_3 / fgh / 222

Answer 4

Way to do this using foreach, if number of elements in each array is same.
$arr1 = ["#ID_1", "#ID_2", "#ID_3"];
$arr2 = ["ABC", "DEF", "FGH"];
$arr3 = ["000", "111", "222"];
foreach($arr1 as $k => $item) {
echo "$item {$arr2[$k]} {$arr3[$k]}<br>";
}

Answer 5

using for loop this way would give you your expected result
<?php
$a = Array(
0 => '#ID_1',
1 => '#ID_2',
2 => '#ID_3'
);
$b = Array(
0 => 'ABC',
1 => 'cde',
2 => 'fgh'
);
$c = Array(
0 => '000',
1 => '111',
2 => '222'
);
$arrlengtha = count($a);
$arrla = $arrlengtha - 2;
$arrlengthb = count($b);
$arrlb = $arrlengthb - 2;
$arrlengthc = count($c);
$arrlc = $arrlengthc - 2;
for($x = 0; $x < $arrla; $x++) {
echo $a[$x]." ";
}
for($x = 0; $x < $arrlb; $x++) {
echo $b[$x]." ";
}
for($x = 0; $x < $arrlc; $x++) {
echo $c[$x]." ";
}
?>