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PHP基础问题
<!--Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--><?php $conn = mysql_connect('localhost', 'root', ''); if(!$conn) { echo "数据库连接失败".mysql_error(); exit(); } echo "数据库连接成功</br>"; $sql = "show databases"; //查找某个库是否存在 print("$sql"); $sql_return = mysql_query($sql); echo "$sql_return "; while($row = mysql_fetch_array($sql_return)) { for($i = 0; $i != count($row); ++$i) { printf("%s", $row[0]); echo ""; } } //mysql_select_db('web', $conn); ?>
<!--Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->数据库连接成功show databasesResource id #4 information_schemainformation_schemamysqlmysqlperformance_schemaperformance_schematesttestwebweb
<!--Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->数据库连接成功show databasesResource id #4 Array ( [0] => information_schema [Database] => information_schema ) Array ( [0] => mysql [Database] => mysql ) Array ( [0] => performance_schema [Database] => performance_schema ) Array ( [0] => test [Database] => test ) Array ( [0] => web [Database] => web )
for($i = 0; $i != count($row); ++$i) { printf("%s", $row[0]); echo ""; }<div class="clear"> </div>