I have string like this: $string = "1A1R0A" and I want to split that $string into 2 arrays:
array1 (
[0] => 1
[1] => 1
[2] => 0
)
array2 (
[0] => A
[1] => R
[2] => A
)
Can you help me to do that ?
I've tried using str_split like this:
$subs = str_split($string,1);
but it doesn't work because it will make array like this:
Array (
[0] => 1
[1] => A
[2] => 0
[3] => R
[4] => 1
[5] => A
)
You can use array_filter to filter the array and keep the same char indexs and str_split to achieve this. Then just simply return if the character is_numeric or not.
This will also keep the actual index points of them chars in the original string.
$str = "1A1R0A";
$arr = (object) array(
'numeric' => array_filter(str_split($str), function($char) {
return is_numeric($char);
}),
'character' => array_filter(str_split($str), function($char) {
return !is_numeric($char);
}),
);
// $arr->numeric will hold numeric values
// $arr->character will hold ascii values
With maintaining the char index's, you can identify where in the string that numeric value is.
foreach($arr->numeric as $key => $value) {
$pos = ++$key;
echo "{$value} is position {$pos} in the String.";
}
You can use a regex to match all patterns of numbers followed by non-numbers.
preg_match_all('/(\d+)(\D+)/', $string, $matches);
Your arrays of numbers/letters will be in the matches. You can work with them directly in $matches[1] and $matches[2], or extract them into a more readable format.
$result = array_combine(['numbers', 'letters'], array_slice($matches, 1));
$string = "1A1R0A";
$array = str_split($string);
$int_array = [];
$str_array = [];
foreach ($array as $char) {
if (is_numeric($char)) $int_array[] = $char;
else $str_array[] = $char;
}
Démo here
preg_match_all() provides a direct, single-function technique without looping.
Capture the digits ($out[1]) and store the letters in the fullstring match ($out[0]). No unnecessary subarrays in $out.
Code: (Demo)
$string = "1A1R0A";
var_export(preg_match_all('~(\d)\K\D~', $string, $out) ? [$out[1], $out[0]] : [[], []]);
echo "\n--- or ---\n";
[$letters, $numbers] = preg_match_all('~(\d)\K\D~', $string, $out) ? $out : [[], []];
var_export($numbers);
echo "\n";
var_export($letters);
Output:
array (
0 =>
array (
0 => '1',
1 => '1',
2 => '0',
),
1 =>
array (
0 => 'A',
1 => 'R',
2 => 'A',
),
)
--- or ---
array (
0 => '1',
1 => '1',
2 => '0',
)
array (
0 => 'A',
1 => 'R',
2 => 'A',
)
If your string may start with a letter or your letter-number sequence is not guaranteed to alternate, you can use this direct technique to separate the two character categories.
Code: (Demo)
$string = "B1A23R4CD";
$output = [[], []]; // ensures that the numbers array comes first
foreach (str_split($string) as $char) {
$output[ctype_alpha($char)][] = $char;
// ^^^^^^^^^^^^^^^^^^- false is 0, true is 1
}
var_export($output);
Output:
array (
0 =>
array (
0 => '1',
1 => '2',
2 => '3',
3 => '4',
),
1 =>
array (
0 => 'B',
1 => 'A',
2 => 'R',
3 => 'C',
4 => 'D',
),
)