Solving PHP tables: the nature of elements, columns or rows?

PHP The essence of the table element: Table structure: The table is composed of

tags, the rows are composed of tags, and the cells are composed of row, forming columns. Row layout: elements are arranged next to each other in a

tags. Column layout:	elements are arranged next to each other within a

to form rows.

Solving PHP tables: the nature of elements, columns or rows?

Tables in PHP organize data using the <table>, <code><tr>, and <code><td> tags. <code><table> is the table itself, <code><tr> is the row, <code><td> is the cell. <p>Understanding the nature of elements is critical to traversing and manipulating tabular data. </p> <p><strong>Columns vs Rows</strong></p> <ul><li> <strong>Columns: </strong><code><td> Elements in a <code> Arrange adjacently within the row.

Row: <tr> An element is a group of <code><td> arranged adjacently in <table> <code> Cell.

Practical case: Get table data

Consider the following table:

<table>
  <tr>
    <td>姓名</td>
    <td>年龄</td>
  </tr>
  <tr>
    <td>Alice</td>
    <td>25</td>
  </tr>
  <tr>
    <td>Bob</td>
    <td>30</td>
  </tr>
</table>

To get the names of all rows in the table:

$table = document->getElementsByTagName('table')[0];
$rows = $table->getElementsByTagName('tr');

$names = [];
foreach ($rows as $row) {
  $cells = $row->getElementsByTagName('td');
  $name = $cells[0]->textContent;
  $names[] = $name;
}

To get all cells in column 1 of the table:

$cells = $table->getElementsByTagName('td');
$column1 = [];
foreach ($cells as $cell) {
  if ($cell->parentNode === $rows[0]) {
    $column1[] = $cell->textContent;
  }
}

Conclusion

Understanding the nature of PHP table elements (rows and columns) is essential to effectively Traversing and manipulating tabular data is critical.

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