Split string with only one delimiting character into key-value pairs [duplicate] - php

Question

This question already has answers here:
Convert backslash-delimited string into an associative array
(4 answers)
Closed 7 months ago.
I have a colon-delimited string like this:
"Part1:Part2:Part3:Part4"
With explode I can split the string into an array:
echo '<pre>';
print_r(explode(":", "Part1:Part2:Part3:Part4"));
echo '</pre>';
Output:
Array
(
[0] => Part1
[1] => Part2
[2] => Part3
[3] => Part4
)
But I need associative array elements like this:
Array
(
[Part1] => Part2
[Part3] => Part4
)
UPDATE
echo '<pre>';
list($key, $val) = explode(':', 'Part1:Part2:Part3:Part4');
$arr= array($key => $val);
print_r($arr);
echo '</pre>';
Result:
Array
(
[Part1] => Part2
)

Answer 1

Alternative solution using only array_* functions.
Collect all values that are going to be keys for the resultant array.
Collect all values that are going to be actual values for the resultant array.
Combine both using array_combine().
Snippet:
<?php
$str = "Part1:Part2:Part3:Part4";
$res = array_combine(
array_map(fn($v) => $v[0], array_chunk(explode(':',$str),2)),
array_map(fn($v) => $v[1], array_chunk(explode(':',$str),2))
);

Answer 2

Using a for loop, you could also use the modulo operator % and create the key in the if part.
The if clause will be true for the first item having the key first and then the value in the else part, toggeling the keys and the values.
$str = "Part1:Part2:Part3:Part4";
$parts = explode(':', $str);
$result = [];
for ($i = 0; $i < count($parts); $i++) {
$i % 2 === 0 ? $k = $parts[$i] : $result[$k] = $parts[$i];
}
print_r($result);
Output
Array
(
[Part1] => Part2
[Part3] => Part4
)
See a php demo

Answer 3

Try this
$string = "Part1:Part2:Part3:Part4";
$arr = explode(":", $string);
$key = "";
$i = 0;
$newArray = [];
foreach($arr as $row){
if($i == 0){
$key = $row;
$i++;
} else {
$newArray[$key] = $row;
$i = 0;
}
}
echo "<pre>";
print_r($newArray);
echo "</pre>";