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Update empty.xml
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reference/var/functions/empty.xml

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<para>
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当 <parameter>var</parameter> 不存在、值为空、等于 0、为 false 时,返回 &true;。参阅 <link
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linkend="language.types.boolean.casting">转换为 boolean</link>。否则返回 &false;
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否则返回 &true;
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</para>
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</refsect1>
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<refsect1 role="examples">

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