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82 lines
3.1 KiB
HTML
82 lines
3.1 KiB
HTML
<!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>Check whether key exists</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.dba-exists" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">dba_exists</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">dba_exists</span> — <span class="dc-title">Check whether key exists</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.dba-exists-description">
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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>dba_exists</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$key</code></span>
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, <span class="methodparam"><span class="type">resource</span> <code class="parameter">$handle</code></span>
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) : <span class="type">bool</span></div>
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<p class="para rdfs-comment">
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<span class="function"><strong>dba_exists()</strong></span> checks whether the specified
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<code class="parameter">key</code> exists in the database.
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.dba-exists-parameters">
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<h3 class="title">参数</h3>
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<p class="para">
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<dl>
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<dt>
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<code class="parameter">key</code></dt>
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<dd>
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<p class="para">
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The key the check is performed for.
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</p>
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</dd>
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<dt>
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<code class="parameter">handle</code></dt>
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<dd>
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<p class="para">
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The database handler, returned by <span class="function"><a href="dba_open.html" class="function">dba_open()</a></span> or
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<span class="function"><a href="dba_popen.html" class="function">dba_popen()</a></span>.
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</p>
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</dd>
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</dl>
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</p>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.dba-exists-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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Returns <strong><code>TRUE</code></strong> if the key exists, <strong><code>FALSE</code></strong> otherwise.
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</p>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.dba-exists-seealso">
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<h3 class="title">参见</h3>
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<p class="para">
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<ul class="simplelist">
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<li class="member"><span class="function"><a href="dba_delete.html" class="function" rel="rdfs-seeAlso">dba_delete()</a> - Delete DBA entry specified by key</span></li>
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<li class="member"><span class="function"><a href="dba_fetch.html" class="function" rel="rdfs-seeAlso">dba_fetch()</a> - Fetch data specified by key</span></li>
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<li class="member"><span class="function"><a href="dba_insert.html" class="function" rel="rdfs-seeAlso">dba_insert()</a> - Insert entry</span></li>
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<li class="member"><span class="function"><a href="dba_replace.html" class="function" rel="rdfs-seeAlso">dba_replace()</a> - Replace or insert entry</span></li>
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</ul>
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</p>
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</div>
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</div></div></div></body></html> |