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PHP連線資料庫並讀取資料列印

<?php $link = mysqli_connect("localhost","root","root") or die("Connect error"); if($link){ echo "Connect success<br>"; mysqli_select_db($link, "world"); $sql = "select * from city"; $result = mysqli_query($link, $sql); $rows = mysqli_num_rows($result); $cols = mysqli_num_fields($result
); echo "rows are ".$rows.", cols are ".$cols."<br>"; echo "<table border='1' align='center' width='80%'>"; echo "<caption>City info</caption>"; echo "<th>ID</th><th>Name</th><th>CountryCode</th><th>District</th><th>Population</th>"
; while ($row=mysqli_fetch_row($result)){ echo "<tr align='center'>"; foreach ($row as $data){ echo "<td>".$data."</td>"; } echo "</tr>"; } echo "</table>"; }else { echo "Connect error"; } ?>