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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<title>转义 bytea 类型的二进制数据</title>
</head>
<body class="docs"><div id="layout">
<div id="layout-content"><div id="function.pg-escape-bytea" class="refentry">
<div class="refnamediv">
<h1 class="refname">pg_escape_bytea</h1>
<p class="verinfo">(PHP 4 &gt;= 4.2.0, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">pg_escape_bytea</span> &mdash; <span class="dc-title">
转义 bytea 类型的二进制数据
</span></p>
</div>
<div class="refsect1 unknown-seealsp" id="refsect1-function.pg-escape-bytea-unknown-seealsp">
<h3 class="title">说明</h3>
<div class="methodsynopsis dc-description">
<span class="methodname"><strong>pg_escape_bytea</strong></span>
( <span class="methodparam"><span class="type">string</span> <code class="parameter">$data</code></span>
) : <span class="type">string</span></div>
<p class="para rdfs-comment">
<span class="function"><strong>pg_escape_bytea()</strong></span> 转义 bytea 数据类型的二进制字符串，返回转义后的字符串。
</p>
<blockquote class="note"><p><strong class="note">Note</strong>:
<p class="para">
当对 bytea 类型字段进行 SELECT 操作时，PostgreSQL 返回前导 \ 的八进制字节值（例如 \032）。用户需要自己将结果转换为二进制格式。
</p>
<p class="para">
本函数需要 PostgreSQL 7.2 或以上版本。在 PostgreSQL 7.2.0 和 7.2.1 版中，如果使用了多字节支持，bytea 类型必须被强制转换。例如 <em>INSERT INTO test_table (image) VALUES (&#039;$image_escaped&#039;::bytea);</em>。PostgreSQL 7.2.2 或以上版本不需要强制转换。异常情况是当客户端和后端字符编码不匹配时，可能会有多字节流错误。用户必须强制转换 bytea 以避免此错误。
</p>
</p></blockquote>
<p class="para">
参见 <span class="function"><a href="pg_unescape_bytea.html" class="function">pg_unescape_bytea()</a></span> 和
<span class="function"><a href="pg_escape_string.html" class="function">pg_escape_string()</a></span>。
</p>
</div>
</div></div></div></body></html>