📄 function.ibase-set-event-handler.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head> <title>Register a callback function to be called when events are posted</title> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.ibase-service-detach.html">ibase_service_detach</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.ibase-timefmt.html">ibase_timefmt</a></div> <div class="up"><a href="ref.ibase.html">Firebird/InterBase Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.ibase-set-event-handler" class="refentry"> <div class="refnamediv"> <h1 class="refname">ibase_set_event_handler</h1> <p class="verinfo">(PHP 5)</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> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">resource</span> <span class="methodname"><b><b>ibase_set_event_handler</b></b></span> ( <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.callback" class="type callback">callback</a></span> <tt class="parameter">$event_handler</tt></span> , <span class="methodparam"><span class="type">string</span> <tt class="parameter">$event_name1</tt></span> [, <span class="methodparam"><span class="type">string</span> <tt class="parameter">$event_name2</tt></span> [, <span class="methodparam"><span class="type">string</span> <tt class="parameter">$...</tt></span> ]] )</div> <div class="methodsynopsis dc-description"> <span class="type">resource</span> <span class="methodname"><b><b>ibase_set_event_handler</b></b></span> ( <span class="methodparam"><span class="type">resource</span> <tt class="parameter">$connection</tt></span> , <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.callback" class="type callback">callback</a></span> <tt class="parameter">$event_handler</tt></span> , <span class="methodparam"><span class="type">string</span> <tt class="parameter">$event_name1</tt></span> [, <span class="methodparam"><span class="type">string</span> <tt class="parameter">$event_name2</tt></span> [, <span class="methodparam"><span class="type">string</span> <tt class="parameter">$...</tt></span> ]] )</div> <p class="para rdfs-comment"> This function registers a PHP user function as event handler for the specified events. </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">event_handler</tt></i></span> <dd> <p class="para"> The callback is called with the event name and the link resource as arguments whenever one of the specified events is posted by the database. </p> <p class="para"> The callback must return <b><tt>FALSE</tt></b> if the event handler should be canceled. Any other return value is ignored. This function accepts up to 15 event arguments. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">event_name1</tt></i></span> <dd> <p class="para"> An event name. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">event_name2</tt></i></span> <dd> <p class="para"> </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">...</tt></i></span> <dd> <p class="para"> </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> The return value is an event resource. This resource can be used to free the event handler using <a href="function.ibase-free-event-handler.html" class="function">ibase_free_event_handler()</a>. </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example"> <p><b>Example #1 <b>ibase_set_event_handler()</b> example</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br /><br /></span><span style="color: #007700">function </span><span style="color: #0000BB">event_handler</span><span style="color: #007700">(</span><span style="color: #0000BB">$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></span></code></div> </div> </div> </p> </div> <div class="refsect1 seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"><a href="function.ibase-free-event-handler.html" class="function" rel="rdfs-seeAlso">ibase_free_event_handler()</a></li> <li class="member"><a href="function.ibase-wait-event.html" class="function" rel="rdfs-seeAlso">ibase_wait_event()</a></li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.ibase-service-detach.html">ibase_service_detach</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.ibase-timefmt.html">ibase_timefmt</a></div> <div class="up"><a href="ref.ibase.html">Firebird/InterBase Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div></body></html>⌨️ 快捷键说明
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