php json decode special characters : <p>I wan't decode json string from file, but there is problem with special characters(for ex. '™', '★'..). My code from PHP</p>

<pre><code>$price_string = file_get_contents("/var/www/bot/price.json");
$price = json_decode($price_string, true);
echo $price["StatTrak™ P250 | Mehndi (Field-Tested)"];
</code></pre>

<p>Result should be 12.01, but the result is this:</p>

<pre><code>Notice: Undefined index: StatTrak� P250 | Mehndi (Minimal Wear) in /var/www/html/menu.php on line ..
</code></pre>

<p>And the JSON string is for example:</p>

<pre><code>{
    "★ Huntsman Knife | Boreal Forest (Well-Worn)": 62.84,
    "StatTrak™ P250 | Mehndi (Field-Tested)": 12.01
}
</code></pre>
