You should use str_replace, which accepts arrays as arguments:
$content = "Email: {{email}}\nFirst Name: {{first_name}}";
$body = str_replace(
['{{email}}', '{{first_name}}'],
['[email protected]', 'Mickey Mouse'],
$content
);
Be careful about using $ in your placeholders. Since it’s widely used in PHP, it’s not safe. It was the reason I’ve used mustache-like syntax in my example.
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