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中文(繁體)
<span><span><span class="hljs-meta"><?php</span></span><span>
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<h1>mysqli::</span><span><span class="hljs-variable constant_">debug</span></span><span> 函數的參數格式該怎麼寫？有哪些規範和注意點？</h1>
<p>在 PHP 中，<code>mysqli::</span><span><span class="hljs-variable constant_">debug</span></span><span>其中， $options是一個字符串，包含調試選項。調用該方法後，MySQLi 將會在指定的選項下輸出調試信息。
參數$options的格式是一個或多個調試選項的組合，每個選項之間用逗號分隔。常用選項包括：
例如：
<span><span>$mysqli</span></span> <span>=</span> <span><span>new</span></span><span> </span><span><span class="function_ invoke__">mysqli</span></span> <span>(</span> <span><span>"localhost"</span></span> <span>,</span> <span><span>"user"</span></span> <span>,</span> <span><span>"password"</span></span> <span>,</span> <span><span>"database"</span></span> <span>);
</span><span><span>$mysqli</span></span> <span>-></span> <span><span class="function_ invoke__">debug</span></span> <span>(</span> <span><span>"client_trace,client_info,file=/tmp/mysqli_debug.log"</span></span> <span>);
</span><p>這條語句會啟用客戶端跟踪和信息顯示，並將調試日誌寫入<span class="fun">/tmp/mysqli_debug.log</span>文件。</p><h2> <span><span>3</span></span> <span>. 注意點</span><ol><li><strong>權限問題：</strong>寫入文件時，確保PHP 有權限訪問指定的路徑，否則調試日誌無法生成。</li><li><strong>性能開銷：</strong>開啟調試會增加運行開銷，不建議在生產環境長期開啟。</li><li><strong>調試信息安全：</strong>調試信息可能包含數據庫用戶名、SQL 語句等敏感信息，注意不要洩露。</li><li><strong>選項組合：</strong>選項之間必須用逗號分隔，不要出現空格，否則可能無法生效。</li><li> <strong>PHP 版本支持：</strong>確保使用的PHP 版本和MySQLi 擴展版本支持<span class="fun">mysqli::debug</span>方法。</li></ol><h2> <span><span>4</span></span> <span>. 實用示例</span><pre>
<span><span>$mysqli</span></span> <span>=</span> <span><span>new</span></span><span> </span><span><span class="function_ invoke__">mysqli</span></span> <span>(</span> <span><span>"localhost"</span></span> <span>,</span> <span><span>"root"</span></span> <span>,</span> <span><span>"123456"</span></span> <span>,</span> <span><span>"test_db"</span></span> <span>);
</span><span><span>// 開啟調試信息，輸出到文件</span></span><span>
</span><span><span>$mysqli</span></span> <span>-></span> <span><span class="function_ invoke__">debug</span></span> <span>(</span> <span><span>"client_trace,file=/var/log/mysqli_debug.log"</span></span> <span>);
</span><span><span>// 執行查詢</span></span><span>
</span><span><span>$result</span></span> <span>=</span> <span><span>$mysqli</span></span> <span>-></span> <span><span class="function_ invoke__">query</span></span> <span>(</span> <span><span>"SELECT * FROM users"</span></span> <span>);
</span><span><span>while</span></span> <span>(</span> <span><span>$row</span></span> <span>=</span> <span><span>$result</span></span> <span>-></span> <span><span class="function_ invoke__">fetch_assoc</span></span> <span>()) {
</span><span><span class="function_ invoke__">print_r</span></span> <span>(</span> <span><span>$row</span></span> <span>);
}
</span><span><span>// 關閉調試</span></span><span>
</span><span><span>$mysqli</span></span> <span>-></span> <span><span class="function_ invoke__">debug</span></span> <span>(</span> <span><span>""</span></span> <span>);</span> <span><span>// 清空調試選項</span></span><span>
</span><p>通過以上方式，開發者可以快速定位MySQLi 操作中的問題，例如SQL 語法錯誤、連接失敗等。</p><p>總之， <span class="fun">mysqli::debug</span>提供了一個便捷的調試機制，但使用時需要注意性能、安全和權限等方面的約束。正確設置調試參數格式和選項，是有效使用該方法的前提。</p> <span><span><?php</span></span><span>
</span><span><span>// 以下部分與文章內容無關，可視為程序尾部</span></span><span>
</span><span><span>echo</span></span><span> </span><span><span>"\nPHP文章生成結束"</span></span> <span>;</span> <span><span>?></span></span><span>
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