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run code in 500+ PHP versions simultaneously
<?php $arr = ["split", "cat", "split", "dog", "cow"]; $rebuild = []; $offset = 0; foreach ($arr as $key => $value) { if ($value === 'split') { $rebuild = array_filter([...$rebuild, array_slice($arr, $offset, $key - $offset)]); $offset = ++$key; } } var_dump([...$rebuild, array_slice($arr, $offset, count($arr) - $offset)]);
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.21, 8.5.0 - 8.5.7
array(2) { [0]=> array(1) { [0]=> string(3) "cat" } [1]=> array(2) { [0]=> string(3) "dog" [1]=> string(3) "cow" } }

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