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7.0 KiB
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<title>提取一行作为数组</title>
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</head>
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<body class="docs"><div id="layout">
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<div id="layout-content"><div id="function.pg-fetch-array" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">pg_fetch_array</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">pg_fetch_array</span> — <span class="dc-title">提取一行作为数组</span></p>
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</div>
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<div class="refsect1 unknown-unknown-seealsq" id="refsect1-function.pg-fetch-array-unknown-unknown-seealsq">
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<h3 class="title">说明</h3>
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<div class="methodsynopsis dc-description">
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<span class="methodname"><strong>pg_fetch_array</strong></span>
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( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$result</code></span>
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[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$row</code></span>
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[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$result_type</code></span>
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]] ) : <span class="type">array</span></div>
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<p class="para rdfs-comment">
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<span class="function"><strong>pg_fetch_array()</strong></span>
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返回一个与所提取的行（元组/记录）相一致的数组。如果没有更多行可供提取，则返回
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<strong><code>FALSE</code></strong>。
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</p>
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<p class="para">
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<span class="function"><strong>pg_fetch_array()</strong></span> 是 <span class="function"><a href="pg_fetch_row.html" class="function">pg_fetch_row()</a></span>
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的扩展版本。在返回的数组中不仅以数字索引方式存放数据（字段编号），默认情况下还用字段名做索引存放数据（字段名）。
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</p>
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<p class="para">
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<code class="parameter">row</code> 是想要取得的行（记录）的编号。第一行为 0。
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</p>
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<p class="para">
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<code class="parameter">result_type</code> 是可选参数，控制着怎样初始化返回值。<code class="parameter">result_type</code>
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是一个常量，可以有以下取值：<strong><code>PGSQL_ASSOC</code></strong>，<strong><code>PGSQL_NUM</code></strong>
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和 <strong><code>PGSQL_BOTH</code></strong>。取值为 <strong><code>PGSQL_ASSOC</code></strong> 时
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<span class="function"><strong>pg_fetch_array()</strong></span> 返回用字段名作为键值索引的关联数组，取值为
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<strong><code>PGSQL_NUM</code></strong> 时用字段编号作为键值，取值为
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<strong><code>PGSQL_BOTH</code></strong> 时则同时用两者作为键值。默认值是 <strong><code>PGSQL_BOTH</code></strong>。
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<p class="para">
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<code class="parameter">result_type</code> 是在 PHP 4.0 中才加入的参数。
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</p>
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</p></blockquote>
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</p>
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<p class="para">
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<span class="function"><strong>pg_fetch_array()</strong></span> 并不明显比使用 <span class="function"><a href="pg_fetch_row.html" class="function">pg_fetch_row()</a></span> 慢，而且在使用中提供了更大的方便。
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</p>
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<p class="para">
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<div class="example" id="example-2489">
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<p><strong>Example #1 <span class="function"><strong>pg_fetch_array()</strong></span></strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php <br /><br />$conn </span><span style="color: #007700">= </span><span style="color: #0000BB">pg_pconnect</span><span style="color: #007700">(</span><span style="color: #DD0000">"dbname=publisher"</span><span style="color: #007700">);<br />if (!</span><span style="color: #0000BB">$conn</span><span style="color: #007700">) {<br /> echo </span><span style="color: #DD0000">"An error occured.\n"</span><span style="color: #007700">;<br /> exit;<br />}<br /><br /></span><span style="color: #0000BB">$result </span><span style="color: #007700">= </span><span style="color: #0000BB">pg_query</span><span style="color: #007700">(</span><span style="color: #0000BB">$conn</span><span style="color: #007700">, </span><span style="color: #DD0000">"SELECT * FROM authors"</span><span style="color: #007700">);<br />if (!</span><span style="color: #0000BB">$result</span><span style="color: #007700">) {<br /> echo </span><span style="color: #DD0000">"An error occured.\n"</span><span style="color: #007700">;<br /> exit;<br />}<br /><br /></span><span style="color: #0000BB">$arr </span><span style="color: #007700">= </span><span style="color: #0000BB">pg_fetch_array</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">PGSQL_NUM</span><span style="color: #007700">);<br />echo </span><span style="color: #0000BB">$arr</span><span style="color: #007700">[</span><span style="color: #0000BB">0</span><span style="color: #007700">] . </span><span style="color: #DD0000">" <- array\n"</span><span style="color: #007700">;<br /><br /></span><span style="color: #0000BB">$arr </span><span style="color: #007700">= </span><span style="color: #0000BB">pg_fetch_array</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">, </span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #0000BB">PGSQL_ASSOC</span><span style="color: #007700">);<br />echo </span><span style="color: #0000BB">$arr</span><span style="color: #007700">[</span><span style="color: #DD0000">"author"</span><span style="color: #007700">] . </span><span style="color: #DD0000">" <- array\n"</span><span style="color: #007700">;<br /><br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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</div>
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</p>
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<p class="para">
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从 4.1.0 开始，<code class="parameter">row</code> 成为可选参数。每次调用 <span class="function"><strong>pg_fetch_array()</strong></span>，内部的行计数器都会加一。
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</p>
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</p></blockquote>
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<p class="para">
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参见 <span class="function"><a href="pg_fetch_row.html" class="function">pg_fetch_row()</a></span> 和 <span class="function"><a href="pg_fetch_object.html" class="function">pg_fetch_object()</a></span> 以及 <span class="function"><a href="pg_fetch_result.html" class="function">pg_fetch_result()</a></span>。
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</p>
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</div>
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</div></div></div></body></html> |