Get list of {} templates from String [PHP]

Question

Hi,

I want to get the template words in a string. Template in the sense of words in {} inside a string. I am adding here a code to explain what I want exactly.

$string = "Hi {username}, Here is your {password}";

function get_template_variables($string)
{

    ....
    ....
    return array();
}

$result = get_template_variables($string);
print_r($result);


array[
    0 => username,
    1 => password
    ]

I hope you understand what I need. I need the definition program to be used inside the get_template_variables($string) method

Answer 1

function get_template_variables($string) {
    preg_match_all('/{([^}]+)}/', $string, $matches);
    return $matches[1];
}

Answer 2

You can do:

function get_template_variables($string) {

    if(preg_match_all('/\{(.*?)\}/',$string,$m)) {
        return $m[1]
    }
    return array();
}

Answer 3

1. Search for '{' character positions and save them in an array.
2. Search for '}' character positions and save them in another array.
3. Check if the data is valid:
   • If both arrays have different sizes, the template has something wrong with it.
   • An index of an n^th '{' character must be inferior to the n^th '}' character, etc.

If everything is ok, you have just to walk through the text and extract the substrings matching the text between n^th '{' and n^th '}'.

Ah, and don't use regular expressions here. Really, you don't need them in a such easy case, except to slow down everything and probably prevent you to validate the template, resulting sometimes in unexpected behavior.

Answer 4

preg_match_all('/{.*}/U' , $string  , $a );

where $result will be

array(1) {
  [0]=>
  array(2) {
    [0]=>
    string(10) "{username}"
    [1]=>
    string(10) "{password}"
  }
}