chunk_by_element_length.php

chunk_by_element_length.php

<?php

/**
 * Chunk by (combined) Element Length
 *
 * Similar to PHP's array_chunk but chunks on combined element length instead of element count.
 * Takes an input array of elements and chunks by combined string lengths.
 *
 * NOTE: Any values that exceed chunk length will be excluded.
 *
 * @access public
 * @param array $input the input array
 * @param int $chunklen string length to chunk array by
 * @return array chunked array
 */
public static function chunk_by_element_length(array $input, $chunklen)
{
    $output = array();

    while ($input)
    {
        $length_remaining = $chunklen;
        $chunk = array();

        while ($input && $length_remaining)
        {
            $value_length = strlen(reset($input));

            if ($value_length > $chunklen)
            {
                array_shift($input);
            }
            else if ($value_length <= $length_remaining)
            {
                $chunk[] = array_shift($input);
                $length_remaining -= $value_length;
            }
            else
            {
                break;
            }
        }

        $output[] = $chunk;
    }

    return $output;
}

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