PHP interview questions and answers for novices - fill-in-the-blank questions and programming questions-PHP Tutorial-php.cn

PHP interview questions and answers for novices - fill-in-the-blank questions and programming questions

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Release： 2016-07-25 08:59:18

Original

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function my_scandir($dir)
{
$files = array();
if ( $handle = opendir($dir) ) {
while ( ($file = readdir($handle)) !== false ) {
if ( $file != “..” && $file != “.” ) {
if ( is_dir($dir . “/” . $file) ) {
$files[$file] = scandir($dir . “/” . $file);
}else {
$files[] = $file;
}
}
}
closedir($handle);
return $files;
}
}

复制代码

14. Briefly describe the implementation principle of unlimited classification in the forum. answer:

/*
The data table structure is as follows:
CREATE TABLE `category` (
`categoryID` smallint(5) unsigned NOT NULL auto_increment,
`categoryParentID` smallint( 5) unsigned NOT NULL default '0′,
`categoryName` varchar(50) NOT NULL default ”,
PRIMARY KEY (`categoryID`)
) ENGINE=MyISAM DEFAULT CHARSET=gbk;
(0, 'First-level category'),
(1, 'Second-level category'),
(1, 'Second-level category'),
(1, 'Second-level category'),
(2, 'Third-level category'),
(2, '333332'),
(2, '234234'),
(3, 'aqqqqqd'),
( 4, 'Haha'),
(5, '66333666′);
*/
//Specify the category id variable $category_id, and then return the All subcategories of the category
//$default_category is the default selected category
function Get_Category($category_id = 0,$level = 0, $default_category = 0)
{
global $DB;
$sql = “SELECT * FROM category ORDER BY categoryID DESC”;
$result = $DB->query( $sql );
while ($rows = $DB->fetch_array($result))
{
$category_array[$rows[categoryParentID] ][$rows[categoryID]] = array('id' => $rows[categoryID], 'parent' => $rows[categoryParentID], 'name' => $rows
< p>[categoryName]);
}
if (!isset($category_array[$category_id]))
{
return “”;
}
foreach($category_array[$category_id] AS $key => $category)
{
if ($category['id'] == $default_category)
{
echo "
}else
{
echo "< ;option value=”.$category['id'].””;
}
if ($level > 0)
{
echo “>” . str_repeat( ” “ , $level ) . ” ” . $category['name'] . “n”;
}
else
{
echo “>” . $category['name'] . “n”;
}
Get_Category( $key, $level + 1, $default_category);
}
unset($category_array[$category_id]);
}
/*
The array format returned by the function is as follows:
Array
(
[1] => Array ( [id] => 1 [name] => Level 1 category [level] => 0 [ParentID] => 0 )
[4] => Array ( [id] => 4 [name] => Secondary category [level] => 1 [ParentID] => 1 )
[9] => Array ( [id] => 9 [ name] => haha [level] => 2 [ParentID] => 4 )
[3] => Array ( [id] => 3 [name] => Secondary category [level] = > 1 [ParentID] => 1 )
[8] => Array ( [id] => 8 [name] => aqqqqqd [level] => 2 [ParentID] => 3 )
[2] => Array ( [id] => 2 [name] => Secondary category [level] => 1 [ParentID] => 1 )
[7] => Array ( [id ] => 7 [name] => 234234 [level] => 2 [ParentID] => 2 )
[6] => Array ( [id] => 6 [name] => 333332 [level] => 2 [ParentID] => 2 )
[5] => Array ( [id] => 5 [name] => Third-level category [level] => 2 [ParentID] => 2 )
[10] => Array ( [id] => 10 [name] => 66333666 [level] => 3 [ParentID] => 5 )
)
*/
/ /Specify the category id, and then return the array
function Category_array($category_id = 0,$level=0)
{
global $DB;
$sql = “SELECT * FROM category ORDER BY categoryID DESC”;
$result = $DB ->query($sql);
while ($rows = $DB->fetch_array($result))
{
$category_array[$rows['categoryParentID']][$rows['categoryID']] = $rows;
}
foreach ($category_array AS $key=>$val)
{
if ($key == $category_id)
{
foreach ($val AS $k => $v)
{
$options[$k] =
array(
'id' => $v['categoryID'], 'name' => $v['categoryName'], 'level ' => $level, 'ParentID'=>$v['categoryParentID']
);
$children = Category_array($k, $level+1);
if (count($children) > 0)
{
$options = $options + $children;
}
}
}
}
unset($category_array[$category_id]);
return $options;
}
?>