Question

假设我有一个这样的字符串：

$string = "hello---world";

我如何用一个连字符替换---？字符串很容易看起来像这样：

$string = "hello--world----what-up";

期望的结果应该是：

$string = "hello-world-what-up";

Answer 1

$string = preg_replace('/-{2,}/','-',$string);

Answer 2

要从开头和结尾删除它们：

$string = trim($string, '-');

Answer 3

尝试$string = preg_replace('/-+/', '-', $string)

Answer 4

$string = preg_replace('/--+/', '-', $string);

Answer 5

这是我正在使用的功能 - 就像魅力一样：）

public static function setString($phrase, $length = null) {
    $result = strtolower($phrase);
    $result = trim(preg_replace("/[^0-9a-zA-Z-]/", "-", $result));
    $result = preg_replace("/--+/", "-", $result);
    $result = !empty($length) ? substr($result, 0, $length) : $result;
    // remove hyphen from the beginning (if exists)
    $first_char = substr($result, 0, 1);
    $result = $first_char == "-" ? substr($result, 1) : $result;
    // remove hyphen from the end (if exists)
    $last_char = substr($result, -1);
    $result = $last_char == "-" ? substr($result, 0, -1) : $result;     
    return $result;
}

使用preg_replace替换多次出现的相同符号？

5 个答案: