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# PHP connection_status() 函数 ## 定义和用法 connection_status() 函数返回当前的连接状态。 可返回的可能值: * 0 - CONNECTION_NORMAL - 连接运行正常 * 1 - CONNECTION_ABORTED - 连接由用户或网络错误终止 * 2 - CONNECTION_TIMEOUT - 连接超时 * 3 - CONNECTION_ABORTED & CONNECTION_TIMEOUT ### 语法 ``` connection_status() ``` ## 例子 ``` <?php switch (connection_status()) { case CONNECTION_NORMAL: $txt = 'Connection is in a normal state'; break; case CONNECTION_ABORTED: $txt = 'Connection aborted'; break; case CONNECTION_TIMEOUT: $txt = 'Connection timed out'; break; case (CONNECTION_ABORTED & CONNECTION_TIMEOUT): $txt = 'Connection aborted and timed out'; break; default: $txt = 'Unknown'; break; } echo $txt; ?> ```