php method to implement classification: first establish a test database; then insert test data; finally output classification through recursion, code such as "for ($i = 0; $i
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The operating environment of this tutorial: windows7 system, PHP5. Version 6, this method is suitable for all brands of computers.
Realize unlimited classification
Step one: Establish a test database
CREATE TABLE `category` ( `id` smallint(5) unsigned NOT NULL auto_increment, `fid` smallint(5) unsigned NOT NULL default '0', `value` varchar(50) NOT NULL default '', PRIMARY KEY (`id`) ) ENGINE=MyISAM DEFAULT CHARSET=utf8;
Step two: Insert test data
INSERT INTO `category` ( `fid`, `value`) VALUES (1,'a'), (1,'b'), (2,'c'), (2,'d'), (4,'e')
Step three: Recursive output classification
$conn = mysqli_connect("localhost", "root", "1234", 'tp51');
if ($conn->connect_error) {
die("连接失败: " . $conn->connect_error);
}
mysqli_set_charset($conn, "utf8");
$sql = "SELECT * FROM category";
$res = $conn->query($sql);
if ($res->num_rows > 0) {
while ($row = $res->fetch_assoc()) {
$arr[] = array($row["id"],$row["fid"],$row["value"]);
}
} else {
echo "0 结果";
}
mysqli_close($conn);
getCate(1);
function getCate($fid = 0)
{
global $arr;
for ($i = 0; $i ";
getCate($arr[$i][0]); //递归
}
}
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