[英]PHP Populate Table Headers Based on Data from Database
我有一個table_headers數據庫表，其中包含包含此數據的id 、 header文本、 parent_id和order_number 。
我如何循環到該記錄以使其產生這種 HTML？
<tr>
<th colspan='2'>Header 1</th>
<th colspan='6'>Header 2</th>
<th rowspan='3'>Header 3</th>
</tr>
<tr>
<th rowspan=2>H1 Child 1</th>
<th rowspan=2>H1 Child 2</th>
<th rowspan=2>h2 Child 1</th>
<th colspan=4>h2 Child 2</th>
</tr>
<tr>
<th>H2 C2 C1</th>
<th>H2 C2 C2</th>
<th>H2 C2 C3</th>
<th>H2 C2 C4</th>
</tr>
結果應該是這樣的。
最后，如何擁有一個包含最低孩子 ID 的數組，就像這樣。
$lowest_child[0]=4; //because the ID of `H1 Child 1` is 4
$lowest_child[1]=5; //because the ID of `H1 Child 2` is 5 and so on
$lowest_child[2]=;
$lowest_child[3]=;
$lowest_child[4]=;
$lowest_child[5]=;
$lowest_child[6]=;
$lowest_child[7]=;
另一個使用 ggordon 提供的答案的示例數據集。
它輸出到這個。 似乎沒有遵循孩子的順序。
這可以在生成一些有用的元數據后實現。 下面的代碼遍歷並在關聯數組中構建一棵樹。 在一些輔助函數getRowSpan和getColSpan的幫助下，表格是從元數據生成的。 生成的json元數據已包含在下面。
為了得到最低孩子的數組。 您只需要使用$levels[$depth]將返回最低深度的子關聯數組。 鍵是孩子的 ID。
<!DOCTYPE html>
<html>
<body>
<?php
$headings = []; # store heading data as array
$numOfRows = count($headings); # 3
$levels = [];
$depth = 0;
$subHeadings = [];
$levels[$depth]=[];
for($i=0;$i<$numOfRows;$i++){
if($headings[$i]["parent_id"]==null){
$headings[$i]["child_count"]=0;
$headings[$i]["child_ids"]=[];
$headings[$i]["depth"]=0;
$levels[$depth][$headings[$i]["id"]]=$headings[$i];
}else{
$subHeadings[]=$headings[$i];
}
}
while(count($subHeadings)>0){
$depth++;
$levels[$depth]=[];
$subHeadingNext=[];
foreach($subHeadings as $sub){
if(
isset( $levels[$depth-1][
$sub["parent_id"]
])
){
$levels[$depth-1][$sub["parent_id"]]["child_count"]++;
$levels[$depth-1][$sub["parent_id"]]["child_ids"][]=$sub["id"];
$sub["child_count"]=0;
$sub["child_ids"]=[];
$sub["depth"]=$depth;
$levels[$depth][$sub["id"]]=$sub;
}else{
$subHeadingNext[] = $sub;
}
}
$subHeadings=$subHeadingNext;
}
#echo json_encode($levels,true);
#colspan is total of all child nodes
function getColSpan($node,$levels){
$childCount = $node["child_count"];
$visitor = $node;
$childrenIds = $visitor["child_ids"];
foreach($childrenIds as $childId){
$childCount+= getColspan($levels[$visitor["depth"]+1][$childId],$levels);
}
return $childCount;
}
#max depth - depth of last child
function getRowSpan($node,$maxDepth){
return $node["child_count"] > 0 ? 1 : $maxDepth - $node["depth"]+1;
}
?>
<table border="3">
<?php
foreach($levels as $level => $nodes){
?>
<tr>
<?php
foreach($nodes as $node){
?>
<td colspan="<?php echo getColSpan($node,$levels) ?>" rowspan="<?php echo getRowSpan($node,$depth) ?>"><?php echo $node["header"] ?></td>
<?php
}
?>
</tr>
<?php
}
?>
</table>
</body>
</html>
<table border="3"> <tbody><tr> <td colspan="2" rowspan="1">Header 1</td> <td colspan="6" rowspan="1">Header 2</td> <td colspan="0" rowspan="3">Header 3</td> </tr> <tr> <td colspan="0" rowspan="2">H1 Child 1</td> <td colspan="0" rowspan="2">H1 Child 2</td> <td colspan="0" rowspan="2">H2 Child 1</td> <td colspan="4" rowspan="1">H2 Child 2</td> </tr> <tr> <td colspan="0" rowspan="1">H2-C2-C1</td> <td colspan="0" rowspan="1">H2-C2-C2</td> <td colspan="0" rowspan="1">H2-C2-C3</td> <td colspan="0" rowspan="1">H2-C2-C4</td> </tr> </tbody></table>
這是存儲在$levels中的處理結果。 它是一個關聯數組。 可以使用$levels[0]訪問從0開始的每個級別。 在每個級別內都有另一個關聯數組，其中包含節點/ tr /表格單元格/標題。 每個標題節點都由 id 索引，即要獲得Heading 1 ，我們將使用$levels[0][1] 。 您可能會在下面看到生成和存儲的其他元數據（深度、子 ID 和子數）：
[
{
"1":{
"id":"1",
"header":"Header 1",
"parent_id":null,
"order_number":"1",
"child_count":2,
"child_ids":[
"4",
"5"
],
"depth":0
},
"2":{
"id":"2",
"header":"Header 2",
"parent_id":null,
"order_number":"1",
"child_count":2,
"child_ids":[
"6",
"7"
],
"depth":0
},
"3":{
"id":"3",
"header":"Header 3",
"parent_id":null,
"order_number":"1",
"child_count":0,
"child_ids":[
],
"depth":0
}
},
{
"4":{
"id":"4",
"header":"H1 Child 1",
"parent_id":"1",
"order_number":"1",
"child_count":0,
"child_ids":[
],
"depth":1
},
"5":{
"id":"5",
"header":"H1 Child 2",
"parent_id":"1",
"order_number":"1",
"child_count":0,
"child_ids":[
],
"depth":1
},
"6":{
"id":"6",
"header":"H2 Child 1",
"parent_id":"2",
"order_number":"1",
"child_count":0,
"child_ids":[
],
"depth":1
},
"7":{
"id":"7",
"header":"H2 Child 2",
"parent_id":"2",
"order_number":"1",
"child_count":4,
"child_ids":[
"12",
"13",
"14",
"15"
],
"depth":1
}
},
{
"12":{
"id":"12",
"header":"H2-C2-C1",
"parent_id":"7",
"order_number":"1",
"child_count":0,
"child_ids":[
],
"depth":2
},
"13":{
"id":"13",
"header":"H2-C2-C2",
"parent_id":"7",
"order_number":"2",
"child_count":0,
"child_ids":[
],
"depth":2
},
"14":{
"id":"14",
"header":"H2-C2-C3",
"parent_id":"7",
"order_number":"3",
"child_count":0,
"child_ids":[
],
"depth":2
},
"15":{
"id":"15",
"header":"H2-C2-C4",
"parent_id":"7",
"order_number":"4",
"child_count":0,
"child_ids":[
],
"depth":2
}
}
]
以下 function 遍歷levels提取沒有子節點的節點
function getNodesWithNoChildren($levels){
$nodesWithNoChildren = [];
foreach($levels as $level => $nodes){
foreach($nodes as $node){
if($node['child_count']==0){
$nodesWithNoChildren[]=$node;
}
}
}
return $nodesWithNoChildren;
}
$nodeNamesWithNoChildren = array_map(function($node){
return $node["header"];
}, getNodesWithNoChildren($levels));
echo implode(", ",$nodeNamesWithNoChildren);
Output
Header 3, H1 Child 1, H1 Child 2, H2 Child 1, H2-C2-C1, H2-C2-C2, H2-C2-C3, H2-C2-C4
function getLeftToRightNodesWithoutChildren($startNode,$levels){
$nodesWithNoChildren = [];
if($startNode == null){
foreach($levels[0] as $headerNode){
$subNodes = getLeftToRightNodesWithoutChildren($headerNode,$levels);
foreach($subNodes as $node){
$nodesWithNoChildren[]=$node;
}
}
}else{
if($startNode['child_count']==0){
$nodesWithNoChildren[]=$startNode;
}
foreach($startNode['child_ids'] as $childId){
$childNode = $levels[$startNode["depth"]+1][$childId];
$subNodes = getLeftToRightNodesWithoutChildren($childNode,$levels);
foreach($subNodes as $node){
$nodesWithNoChildren[]=$node;
}
}
}
return $nodesWithNoChildren;
}
$nodeNamesWithNoChildren = array_map(function($node){
return $node["header"];
}, getLeftToRightNodesWithoutChildren(null,$levels));
echo implode(", ",$nodeNamesWithNoChildren);
Output
H1 Child 1, H1 Child 2, H2 Child 1, H2-C2-C1, H2-C2-C2, H2-C2-C3, H2-C2-C4, Header 3
獲取“包含最低孩子 ID 的數組”
$lowest_child = array_map(function($node){
return $node["id"];
}, getLeftToRightNodesWithoutChildren(null,$levels));
echo implode(", ",$lowest_child);
Output
4, 5, 6, 12, 13, 14, 15, 3
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