Mustache engine is treating some data as variables and replacing with with empty string

[shkhalid]

$mustache = new \Mustache_Engine();
$variables = [
    'first_name' => 'Jackie',
    'last_name' => 'Chain',
];
        
dd($mustache->render('<a href="{{first_name}}" >{{last_name </a>}}', $variables));

In this case my output should be <a href="Jackie" >{{last_name </a>}} but now the result is <a href="Jackie" >

[bobthecow]

i'm not sure if it's a typo or if you intended it this way, but {{last_name </a>}} is a variable. it's just undefined. per the mustache spec, undefined variables are replaced with empty strings.

<?php

require_once __DIR__ . '/vendor/autoload.php';

$mustache = new \Mustache_Engine();
$variables = [
    'first_name' => 'Jackie',
    'last_name' => 'Chain',
    'last_name </a>' => 'wat',
];

echo $mustache->render('<a href="{{first_name}}" >{{last_name </a>}}', $variables);

… results in <a href="Jackie" >wat