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169 lines
6.1 KiB
HTML
169 lines
6.1 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>打印一条回溯。</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.debug-print-backtrace" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">debug_print_backtrace</h1>
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<p class="verinfo">(PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">debug_print_backtrace</span> — <span class="dc-title">
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打印一条回溯。
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</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.debug-print-backtrace-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>debug_print_backtrace</strong></span>
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([ <span class="methodparam"><span class="type">int</span> <code class="parameter">$options</code><span class="initializer"> = 0</span></span>
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[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$limit</code><span class="initializer"> = 0</span></span>
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]] ) : <span class="type"><span class="type void">void</span></span></div>
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<p class="para rdfs-comment">
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<span class="function"><strong>debug_print_backtrace()</strong></span> 打印了一条 PHP 回溯。它打印了函数调用、被 included/required 的文件和
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<span class="function"><a href="eval.html" class="function">eval()</a></span> 的代码。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.debug-print-backtrace-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">options</code></dt>
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<dd>
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<p class="para">
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从 5.3.6 开始，这个参数是以下选项的位掩码：
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<table class="doctable table">
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<caption><strong><span class="function"><strong>debug_print_backtrace()</strong></span> 选项</strong></caption>
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<tbody class="tbody">
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<tr>
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<td>DEBUG_BACKTRACE_IGNORE_ARGS</td>
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<td>
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是否忽略 "args" 的索引，包括所有的 function/method 的参数，能够节省内存开销。
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</td>
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</tr>
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</tbody>
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</table>
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</p>
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</dd>
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<dt>
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<code class="parameter">limit</code></dt>
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<dd>
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<p class="para">
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从 5.4.0 开始，这个参数能够用于限制返回堆栈帧的数量。
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默认为 (<code class="parameter">limit</code>=<em>0</em>) ，返回所有的堆栈帧。
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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.debug-print-backtrace-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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没有返回值。
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</p>
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</div>
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<div class="refsect1 changelog" id="refsect1-function.debug-print-backtrace-changelog">
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<h3 class="title">更新日志</h3>
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<p class="para">
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<table class="doctable informaltable">
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<thead>
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<tr>
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<th>版本</th>
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<th>说明</th>
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</tr>
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</thead>
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<tbody class="tbody">
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<tr>
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<td>5.4.0</td>
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<td>
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添加了可选的参数 <code class="parameter">limit</code>。
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</td>
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</tr>
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<tr>
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<td>5.3.6</td>
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<td>
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添加了可选的参数 <code class="parameter">options</code>。
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</td>
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</tr>
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</tbody>
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</table>
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.debug-print-backtrace-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-457">
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<p><strong>Example #1 <span class="function"><strong>debug_print_backtrace()</strong></span> 范例</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 /></span><span style="color: #FF8000">// include.php file<br /><br /></span><span style="color: #007700">function </span><span style="color: #0000BB">a</span><span style="color: #007700">() {<br /> </span><span style="color: #0000BB">b</span><span style="color: #007700">();<br />}<br /><br />function </span><span style="color: #0000BB">b</span><span style="color: #007700">() {<br /> </span><span style="color: #0000BB">c</span><span style="color: #007700">();<br />}<br /><br />function </span><span style="color: #0000BB">c</span><span style="color: #007700">(){<br /> </span><span style="color: #0000BB">debug_print_backtrace</span><span style="color: #007700">();<br />}<br /><br /></span><span style="color: #0000BB">a</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 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 /></span><span style="color: #FF8000">// 文件 test.php<br />// 这是你应该运行的文件<br /><br /></span><span style="color: #007700">include </span><span style="color: #DD0000">'include.php'</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 class="example-contents"><p>以上例程的输出类似于：</p></div>
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<div class="example-contents screen">
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<div class="cdata"><pre>
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#0 c() called at [/tmp/include.php:10]
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#1 b() called at [/tmp/include.php:6]
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#2 a() called at [/tmp/include.php:17]
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#3 include(/tmp/include.php) called at [/tmp/test.php:3]
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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.debug-print-backtrace-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="debug_backtrace.html" class="function" rel="rdfs-seeAlso">debug_backtrace()</a> - 产生一条回溯跟踪(backtrace)</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> |