replace.php

<?php
$nickname = "xISRAPILx";
$balance = 150000;
$clan = "CloudMine";

$text = "Привет, {NICKNAME}, ваш баланс: {BALANCE}, Ваш клан: {CLAN}";

$keys = ["{NICKNAME}", "{BALANCE}", "{CLAN}"];
$values = [$nickname, $balance, $clan];

$key_values = ["{BALANCE}" => $balance, "{NICKNAME}" => $nickname, "{CLAN}" => $clan];

$startTime = microtime(true);
for($i = 0; $i < 500000; $i++){
    str_replace($keys, $values, $text);
}
echo "500000 str_replace + keys array + values array: ".round(microtime(true) - $startTime, 5).PHP_EOL;

$startTime = microtime(true);
for($i = 0; $i < 500000; $i++){
    str_replace(array_keys($key_values), array_values($key_values), $text);
}
echo "500000 str_replace + array_keys + array+values: ".round(microtime(true) - $startTime, 5).PHP_EOL;