Question

我有一个来自db：$text=

的字符串

parameter1=value1
parameter2=value2
otherparemeter=othervalue

我需要一个函数来用新值替换参数，但是如果参数不存在;必须添加到字符串;

示例：updatestring ($text,"parameter1","newvalue"):

结果：

parameter1=newvalue
parameter2=value2
otherparemeter=othervalue

或者：updatestring ($text,"myparameter","myvalue"):

结果：

parameter1=value1
parameter2=value2
otherparemeter=othervalue
myparameter=myvalue

谢谢！

Answer 1

如果每个参数和值都在自己的行上，这可能会有效

function updatestring($text, $param1, $param2)
{
    if( stristr($text, $param1.'=') ) $text = preg_replace("`$param1=.*\n`iU", "$param1=$param2".PHP_EOL, $text);
    else $text .= PHP_EOL.$param1.'='.$param2;
    return $text;
}

Answer 2

鉴于您输入的格式parse_ini_string应该可以将数据解析为可以轻松更改和重新格式化的结构。

也许是这样的：

$a =<<<EOF
parameter1=value1
parameter2=value2
otherparemeter=othervalue
EOF;

function replacevalue($text, $k, $v){
    $dat = parse_ini_string($text);
    $ret = "";
    if(isset($dat[$k])){
        $dat[$k] = $v;
        foreach($dat as $prop=>$val){
            $ret.= $prop."=".$val."\n";
        }
        return $ret;
    }
}
echo replacevalue($a, "parameter1", "Hello World");

Answer 3

谢谢@Orangepill;我纠正了你的功能;现在它正在运作

override func viewDidLoad() {
        super.viewDidLoad()


        // Sets custom nav bar view so we can add multiple bar buttons
        navBar = UINavigationBar(frame: CGRectMake(0, 20, UIScreen.mainScreen().bounds.size.width, 44))
        navBar.barTintColor = UIColor.blackColor() // Sets bar to black
        navBar.translucent = false
        self.view.addSubview(navBar)
        navItem = UINavigationItem(title: "\(name)") // Sets title
        navBar.titleTextAttributes = [ NSFontAttributeName: UIFont(name: "Helvetica Neue", size: 25)!,  NSForegroundColorAttributeName: UIColor.whiteColor()]
// Set icons
            var backIcon = UIImage(named: "backButton")
            let backButton = UIBarButtonItem(image: backIcon, style: UIBarButtonItemStyle.Plain, target: self, action: "backButton")
            navItem.leftBarButtonItem = backButton

            var userQuery = PFQuery(className: "Followers")
            userQuery.whereKey("following", equalTo: username)
            userQuery.findObjectsInBackgroundWithBlock({ (objects, error) -> Void in
                if error == nil {

                    if let objects = objects {

                        for object in objects {

                            if let follower = object["follower"] as? String {
                                if follower == PFUser.currentUser()!.username! {
                                    var followingIcon = UIImage(named: "followingButton")
                                    let followingButton = UIBarButtonItem(image: followingIcon, style: UIBarButtonItemStyle.Plain, target: self, action: "unfollowUser")
                                    self.navItem.rightBarButtonItem = followingButton

                                    self.navItem.rightBarButtonItem?.tintColor = UIColor.orangeColor()
                                } else {

                                    var followIcon = UIImage(named: "followButton")
                                    let followButton = UIBarButtonItem(image: followIcon, style: UIBarButtonItemStyle.Plain, target: self, action: "followUser")
                                    self.navItem.rightBarButtonItem = followButton


                                    self.navItem.rightBarButtonItem?.tintColor = UIColor.darkGrayColor()
                                }
                            }
                        }

                    }
                } else {
                    println(error)
                }
            })

php替换字符串类型参数=值

3 个答案: