替换字符串中的占位符变量 [英] Replacing Placeholder Variables in a String

问题描述

刚刚完成此功能.基本上，假设要遍历一个字符串并尝试查找任何占位符变量，该变量将位于两个大括号{}之间.它获取大括号之间的值，并使用它来查找应与键匹配的数组.然后，它将字符串中的花括号变量替换为匹配键数组中的值.

Just finished making this function. Basically it is suppose to look through a string and try to find any placeholder variables, which would be place between two curly brackets {}. It grabs the value between the curly brackets and uses it to look through an array where it should match the key. Then it replaces the curly bracket variable in the string with the value in the array of the matching key.

尽管有一些问题.首先是当我var_dump($matches)时，将结果放入数组中的数组中.因此，我只需要使用两个foreach()即可达到正确的数据.

It has a few problems though. First is when I var_dump($matches) it puts puts the results in an array, inside an array. So I have to use two foreach() just the reach the correct data.

我也觉得它很重，我一直在寻找它，试图使其变得更好，但我有些沮丧.我错过了任何优化吗?

I also feel like its heavy and I've been looking over it trying to make it better but I'm somewhat stumped. Any optimizations I missed?

function dynStr($str,$vars) {
    preg_match_all("/\{[A-Z0-9_]+\}+/", $str, $matches);
    foreach($matches as $match_group) {
        foreach($match_group as $match) {
            $match = str_replace("}", "", $match);
            $match = str_replace("{", "", $match);
            $match = strtolower($match);
            $allowed = array_keys($vars);
            $match_up = strtoupper($match);
            $str = (in_array($match, $allowed)) ? str_replace("{".$match_up."}", $vars[$match], $str) : str_replace("{".$match_up."}", '', $str);
        }
    }
    return $str;
}

$variables = array("first_name"=>"John","last_name"=>"Smith","status"=>"won");
$string = 'Dear {FIRST_NAME} {LAST_NAME}, we wanted to tell you that you {STATUS} the competition.';
echo dynStr($string,$variables);
//Would output: 'Dear John Smith, we wanted to tell you that you won the competition.'

推荐答案

我认为对于这样一个简单的任务，您无需使用RegEx:

I think for such a simple task you don't need to use RegEx:

$variables = array("first_name"=>"John","last_name"=>"Smith","status"=>"won");
$string = 'Dear {FIRST_NAME} {LAST_NAME}, we wanted to tell you that you {STATUS} the competition.';

foreach($variables as $key => $value){
    $string = str_replace('{'.strtoupper($key).'}', $value, $string);
}

echo $string; // Dear John Smith, we wanted to tell you that you won the competition.

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