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<?php function stringMultiplicate($first, $second) { // Create array include result of 1 number in $second string * first $result = []; $strFirst = (string)$first; $strSecond = (string)$second; $maxLength = 0; for ($i = strlen($strSecond) - 1; $i >= 0; $i--) { $index = $i; $number = (int)$strSecond[$i]; $result[$index] = ''; $k = strlen($strSecond) - 1 - $i; $div = 0; for ($j = (strlen($strFirst) - 1); $j >= 0; $j--) { while ($k != 0) { $result[$index] .= '0'; $k--; } $next = ($number * $strFirst[$j] + $div); if (strlen($next) > 1 && $j != 0) { $result[$index] .= ((string)$next)[strlen($next) - 1]; $div = ((string)$next)[0]; } else { $result[$index] .= $number * $strFirst[$j] + $div; $div = 0; } } if (strlen($result[$index]) > $maxLength) { $maxLength = $result[$index]; } $result[$index] = strrev($result[$index]); } $multi = []; for ($j = 0; $j < $maxLength; $j++) { $sum = 0; for ($i = 0; $i < count($result); $i++) { var_dump($result[$i]); if (!isset($result[$i][$j])) { $result[$i][$j] = 0; } $sum += (int)$result[$i][$j]; } $multi[$j] = $sum; } return $multi; } var_dump(stringMultiplicate(12345, 123)); var_dump(12345*123);
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