php str_replace实现只替换第一次的几种方法

我想实现一个php字符串替换的功能，类似str_replace，但php str_replace是替换所有的匹配，我想实现只替换第一次，该如何做呢？

第一种方法：使用preg_replace

function str_replace_first($from, $to, $content)
{
    $from = \'/\'.preg_quote($from, \'/\').\'/\';

    return preg_replace($from, $to, $content, 1);
}

echo str_replace_first(\'abc\', \'123\', \'abcdef abcdef abcdef\'); 
// outputs \'123def abcdef abcdef\'

第二种方法：substr_replace

function str_replace_first($search, $replace, $subject) {
    $pos = strpos($subject, $search);
    if ($pos !== false) {
        return substr_replace($subject, $replace, $pos, strlen($search));
    }
    return $subject;
}

第三种方法：strpos

function str_replace_limit($search, $replace, $string, $limit = 1) {
    $pos = strpos($string, $search);

    if ($pos === false) {
        return $string;
    }

    $searchLen = strlen($search);

    for ($i = 0; $i < $limit; $i++) {
        $string = substr_replace($string, $replace, $pos, $searchLen);

        $pos = strpos($string, $search);

        if ($pos === false) {
            break;
        }
    }

    return $string;
}

用法示例：

$search  = \'foo\';
$replace = \'bar\';
$string  = \'foo wizard makes foo brew for evil foo and jack\';
$limit   = 2;

$replaced = str_replace_limit($search, $replace, $string, $limit);

echo $replaced;
// bar wizard makes bar brew for evil foo and jack

第四种方法：implode

function str_replace_first($search, $replace, $subject) {
    return implode($replace, explode($search, $subject, 2));
}