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may also return "Unknown" if no description was found
php/doc-en@ad323a8
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reference/xml/functions/xml-error-string.xml

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<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<!-- EN-Revision: e700973701abc1897fb9af01d6efca3a53507f23 Maintainer: hirokawa Status: ready -->
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<!-- EN-Revision: ad323a863f0795ef39c4d8ae85e182b9086321d1 Maintainer: hirokawa Status: ready -->
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<!-- Credits: mumumu -->
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<refentry xml:id="function.xml-error-string" xmlns="http://docbook.org/ns/docbook">
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<refnamediv>
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&reftitle.returnvalues;
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<para>
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エラーコード <parameter>error_code</parameter> の説明を有する文字列を
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返します。説明がない場合には &null; を返します。
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返します。説明がない場合には &null; または <literal>"Unknown"</literal> を返します。
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</para>
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</refsect1>
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