PHP associative array values replace string variable

Question

I have a string as:

$string = "My name is {name}. I live in {detail.country} and age is {detail.age}";

and I have an array like that and it will be always in that format.

$array = array(
   'name' => 'Jon',
   'detail' => array(
     'country' => 'India',
     'age' => '25'
  )
);

and the expected output should be like :

My name is Jon. I live in India and age is 25

So far I tried with the following method:

$string = str_replace(array('{name}','{detail.country}','{detail.age}'), array($array['name'],$array['detail']['country'],$array['detail']['age']));

But the thing is we can not use the plain text of string variable. It should be dynamic on the basis of the array keys.

Answer 1

You can use preg_replace_callback() for a dynamic replacement:

$string = preg_replace_callback('/{([\w.]+)}/', function($matches) use ($array) {
    $keys = explode('.', $matches[1]);
    $replacement = '';

    if (sizeof($keys) === 1) {
        $replacement = $array[$keys[0]];
    } else {
        $replacement = $array;

        foreach ($keys as $key) {
            $replacement = $replacement[$key];
        }
    }

    return $replacement;
}, $string);

It also exists preg_replace() but the above one allows matches processing.