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130 lines
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130 lines
6.9 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>Register a callback function to be called when events are posted</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.ibase-set-event-handler" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">ibase_set_event_handler</h1>
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<p class="verinfo">(PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">ibase_set_event_handler</span> — <span class="dc-title">Register a callback function to be called when events are posted</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.ibase-set-event-handler-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>ibase_set_event_handler</strong></span>
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( <span class="methodparam"><span class="type"><a href="language.types.callable.html" class="type callable">callable</a></span> <code class="parameter">$event_handler</code></span>
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, <span class="methodparam"><span class="type">string</span> <code class="parameter">$event_name1</code></span>
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[, <span class="methodparam"><span class="type">string</span> <code class="parameter">$...</code></span>
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] ) : <span class="type">resource</span></div>
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<div class="methodsynopsis dc-description">
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<span class="methodname"><strong>ibase_set_event_handler</strong></span>
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( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$connection</code></span>
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, <span class="methodparam"><span class="type"><a href="language.types.callable.html" class="type callable">callable</a></span> <code class="parameter">$event_handler</code></span>
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, <span class="methodparam"><span class="type">string</span> <code class="parameter">$event_name1</code></span>
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[, <span class="methodparam"><span class="type">string</span> <code class="parameter">$...</code></span>
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] ) : <span class="type">resource</span></div>
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<p class="para rdfs-comment">
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This function registers a PHP user function as event handler for the
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specified events.
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.ibase-set-event-handler-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">event_handler</code></dt>
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<dd>
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<p class="para">
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The callback is called with the event name and the link resource as
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arguments whenever one of the specified events is posted by the
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database.
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</p>
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<p class="para">
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The callback must return <strong><code>FALSE</code></strong> if the event handler should be
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canceled. Any other return value is ignored. This function accepts up
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to 15 event arguments.
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</p>
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</dd>
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<dt>
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<code class="parameter">event_name1</code></dt>
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<dd>
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<p class="para">
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An event name.
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</p>
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</dd>
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<dt>
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<code class="parameter">...</code></dt>
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<dd>
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<p class="para">
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At most 15 events allowed.
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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.ibase-set-event-handler-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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The return value is an event resource. This resource can be used to free
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the event handler using <span class="function"><a href="ibase_free_event_handler.html" class="function">ibase_free_event_handler()</a></span>.
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.ibase-set-event-handler-examples">
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<h3 class="title">范例</h3>
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<p class="para">
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<div class="example" id="example-1203">
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<p><strong>Example #1 <span class="function"><strong>ibase_set_event_handler()</strong></span> example</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 /></span><span style="color: #007700">function </span><span style="color: #0000BB">event_handler</span><span style="color: #007700">(</span><span style="color: #0000BB">$event_name</span><span style="color: #007700">, </span><span style="color: #0000BB">$link</span><span style="color: #007700">)<br />{<br /> if (</span><span style="color: #0000BB">$event_name </span><span style="color: #007700">== </span><span style="color: #DD0000">"NEW ORDER"</span><span style="color: #007700">) {<br /> </span><span style="color: #FF8000">// process new order<br /> </span><span style="color: #0000BB">ibase_query</span><span style="color: #007700">(</span><span style="color: #0000BB">$link</span><span style="color: #007700">, </span><span style="color: #DD0000">"UPDATE orders SET status='handled'"</span><span style="color: #007700">);<br /> } else if (</span><span style="color: #0000BB">$event_name </span><span style="color: #007700">== </span><span style="color: #DD0000">"DB_SHUTDOWN"</span><span style="color: #007700">) {<br /> </span><span style="color: #FF8000">// free event handler<br /> </span><span style="color: #007700">return </span><span style="color: #0000BB">false</span><span style="color: #007700">;<br /> }<br />}<br /><br /></span><span style="color: #0000BB">ibase_set_event_handler</span><span style="color: #007700">(</span><span style="color: #0000BB">$link</span><span style="color: #007700">, </span><span style="color: #DD0000">"event_handler"</span><span style="color: #007700">, </span><span style="color: #DD0000">"NEW_ORDER"</span><span style="color: #007700">, </span><span style="color: #DD0000">"DB_SHUTDOWN"</span><span style="color: #007700">);<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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</div>
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<div class="refsect1 seealso" id="refsect1-function.ibase-set-event-handler-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="ibase_free_event_handler.html" class="function" rel="rdfs-seeAlso">ibase_free_event_handler()</a> - Cancels a registered event handler</span></li>
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<li class="member"><span class="function"><a href="ibase_wait_event.html" class="function" rel="rdfs-seeAlso">ibase_wait_event()</a> - Wait for an event to be posted by the database</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> |