I have an array with following elements:
$array = ["START","a","a","a","START","b","b","b","START","c","c","c"];
I need to get only the elements of the array AFTER every occurence of the key element "START" into their own array:
Example:
$arr[0] = ["a","a","a"];
$arr[1] = ["b","b","b"];
$arr[2] = ["c","c","c"];
I can then break down each individual array and process how I need.
Thanks!
I've played with array slice and such, which seemed to be the closest answer but to no avail.
Design: Collect each element using START as a delimiter.
Implementation:
$array = ["START", "a", "a", "a", "START", "b", "b", "b", "START", "c", "c", "c"];
$result = [];
$tempArray = [];
// Loop through each element in the original array
foreach ($array as $element) {
if ($element === "START") {
// If we encounter "START" and $tempArray is not empty, add it to $result
if (!empty($tempArray)) {
$result[] = $tempArray;
$tempArray = []; // Reset for the next segment
}
} else { // The element was not START, so we add this to the tempArray
// Collect elements in the temp array
$tempArray[] = $element;
}
}
// Don't forget to add the last collected array if it exists
if (!empty($tempArray)) {
$result[] = $tempArray;
}
// Output the result for verification
print_r($result);
Note that in PHP, the [] syntax is a shorthand way to append an item without needing to specify an index.
An approach to this would be to loop through each element and spliting on each encounter of 'Start'
$array = ['START', 'a', 'a', 'a', 'START', 'b', 'b', 'b', 'START', 'c', 'c', 'c'];
$new_array = []; // new array to write to
$counter = 0; // default counter for 'start' occurence
foreach ($array as $arr) {
//checking occurance / encounter for 'START'
if ($arr === 'START') {
$counter++;
}
else {
if(!$new_array)
{
$counter = 0;
}
$new_array[$counter][] = $arr; //add to array
}
}
print_r($new_array);
which would give you a result of
(
[0] => Array
(
[0] => a
[1] => a
[2] => a
)
[1] => Array
(
[0] => b
[1] => b
[2] => b
)
[2] => Array
(
[0] => c
[1] => c
[2] => c
)
)
Simple and Performing Solution - O(n)
$array = ["START","a","a","a","START","b","b","b","START","c","c","c"];
$res = [];
$index = 0;
foreach ($array as $val) {
if ($val === 'START') {
$index++;
} else if ($index > 0) {
$res[$index - 1][] = $val;
}
}
var_dump($res);
Use two build-in functions array_key with second argument as "START" to find keys with that value and arrya_slice to take a part of the input array
$array = ['1',"START","a","a","a","START","b","b","b","START","c","c","c"];
// Find all positions of START in the array
$keys = array_keys($array, 'START', True);
//.Save the first array start
$prev = array_shift($keys) + 1;
// Add length of the array as the last array end
array_push($keys, count($array));
$res = [];
foreach($keys as $x) {
// Take part of the array to the result
$res[] = array_slice($array, $prev, $x-$prev);
// Next array started
$prev = $x+1;
}
print_r($res);
continue3v4l.org/YqJL4