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<?php declare(strict_types=1); namespace Psl\Str; /** * Returns the string padded to the total length by appending the `$pad_string` * to the left. * * If the length of the input string plus the pad string exceeds the total * length, the pad string will be truncated. If the total length is less than or * equal to the length of the input string, no padding will occur. * * Example: * * Str\pad_left('Ay', 4) * => Str(' Ay') * * Str\pad_left('ay', 3, 'A') * => Str('Aay') * * Str\pad_left('eet', 4, 'Yeeeee') * => Str('Yeet') * * Str\pad_left('مرحبا', 8, 'م') * => Str('ممممرحبا') * * @param non-empty-string $pad_string * @param int<0, max> $total_length * * @pure */ function pad_left(string $string, int $total_length, string $pad_string = ' ', Encoding $encoding = Encoding::UTF_8): string { while (($length = length($string, $encoding)) < $total_length) { /** @var int<0, max> $remaining */ $remaining = $total_length - $length; if ($remaining <= length($pad_string, $encoding)) { $pad_string = slice($pad_string, 0, $remaining, $encoding); } $string = $pad_string . $string; } return $string; }
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