How does PHP transforms an integer on a string? like "3" onto "three"

From: Date: Fri, 14 Feb 2003 00:10:55 +0000
Subject: How does PHP transforms an integer on a string? like "3" onto "three"
Groups: php.general 
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Does PHP transforms an integer on a string? Like: "78" onto "seventy eight" How does it do it?

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