PHP replace string between curly brackets with array element value

Question

I've a body of content that is read in and it contains numerous strings like {{some_text}} and what I'm trying to do is to find all these occurances and replace them with another value from an array for example $text["some_text"].

I've tried using preg_replace but not sure how I go about taking the found text between the brackets and use it in the replace value.

$body = "This is a body of {{some_text}} text from a book.";
$text["some_text"] = "really cool";
$parsedBody = preg_replace("\[{].*[}]/U", $text[""], $body);

As you can see I'm trying to get the some_texttext out of the string and use it to call an element from an array, this example is very basic as there $bodyvalue is vastly larger and $texthas a couple hundred elements too it.

@Barmar, thanks for the suggestion, I'll look at preg_replace_callback now, for what I need it is overkill to use a templagte library. — llanato
– llanato, Commented Sep 2, 2015 at 21:47
An other way consists to use preg_split with the PREG_SPLIT_DELIM_CAPTURE option, to map the array and replace odd items (use an associative array) and to implode. — Casimir et Hippolyte
– Casimir et Hippolyte, Commented Sep 2, 2015 at 21:49
@Barmar, took your advice after my custom code got too complex, using twig via composer now, makes life much easier, thanks. — llanato
– llanato, Commented Sep 2, 2015 at 23:50

l'L'l · Accepted Answer · 2015-09-02 21:59:29Z

7

You can use preg_replace_callback and use the capturing group ([^}]+) to find an index in the array $text:

$repl = preg_replace_callback('/{{([^}]+)}}/', function ($m) use ($text) {
            return $text[$m[1]]; }, $body);
//=> This is a body of really cool text from a book.

The use ($text) statement passes the reference of $text to the anonymous function.

edited Sep 2, 2015 at 21:59

l'L'l

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answered Sep 2, 2015 at 21:49

anubhava

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Comments

Andris · Accepted Answer · 2015-09-02 22:30:49Z

4

How about doing it the other way around - instead of finding all {{...}} placeholders and looking up their values, iterate through all values and replace placeholders that match like this:

foreach ($text as $key => $value) {
    $placeholder = sprintf('{{%s}}', $key);
    $body        = str_replace($placeholder, $value, $body);
}

You can even wrap it into a function:

function populatePlaceholders($body, array $vars)
{
    foreach ($vars as $key => $value) {
        $placeholder = sprintf('{{%s}}', $key);
        $body        = str_replace($placeholder, $value, $body);
    }

    return $body;
}

answered Sep 2, 2015 at 22:30

Andris

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Comments

AbraCadaver · Accepted Answer · 2015-09-02 21:56:01Z

0

Just for fun, using your array as is:

$result = str_replace(array_map(function($v){return '{{'.$v.'}}';}, array_keys($text)),
                      $text, $body);

Or if your array is like $text['{{some_text}}'] then simply:

$result = str_replace(array_keys($text), $text, $body);

answered Sep 2, 2015 at 21:56

AbraCadaver

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