How to Edit a Grid With PHP

A grid is a structure composed of intersecting horizontal and vertical lines that form boxes called cells. In software development, programming languages like PHP can represent a grid and a grid's cells in a structure called an array. By using an array, developers can create a grid structure, define and alter the grid's display and access data in the grid's cells. Arrays typically hold a single row of data with multiple columns, and multidimensional arrays represent a grid with multiple rows and multiple columns.

How to Edit a Grid With PHP

• 1

  Open a text editor and create an array in PHP using the array() function. Name the array $table. Place the code inside of <?php and ?> script delimiters.

  <?php

  $table = array();

  ?>

• 2

  Since $table is an array that contains no values, add three more arrays to the $table array so that $table is an array holding three more arrays. The $table array represents the grid's rows, and the three new arrays represent the grid's columns.

  <?php

  $table = array(array(), array(), array());

  ?>

• 3

  Add three numeric values to each of the three arrays inside of the $table array. These arrays are now arrays that hold individual values. The values represent data held in the grid's cells.

  <?php

  $table = array(

  array(1, 2, 3), array(4, 5, 6), array(7, 8, 9));

  ?>

• 4

  Use two for loops to display the rows, columns and cells in the $table array. Write a new line after each row to visually distinguish rows from columns in the grid.

  <?php

  $table = array(array(1, 2, 3), array(4, 5, 6), array(7, 8, 9));

  for ($row = 0; $row < 3; $row++)

  {

  echo "";

  for ($col = 0; $col < 3; $col++)

  {

  echo $table[$row][$col];

  }

  }

  ?>

• 5

  Edit the cells in the grid, accessing each cell by retrieving each row and column. Add 1 to each cell value.

  <?php

  $table = array(array(1, 2, 3), array(4, 5, 6), array(7, 8, 9));

  for ($row = 0; $row < 3; $row++)

  {

  echo "";

  for ($col = 0; $col < 3; $col++)

  {

  echo $table[$row][$col];

  }

  }

  for ($row = 0; $row < 3; $row++)

  {

  for ($col = 0; $col < 3; $col++)

  {

  $table[$row][$col] = $table[$row][$col] + 1;

  }

  }

  ?>

• 6

  Loop through $table again to display the edited array.

  <?php

  $table = array(array(1, 2, 3), array(4, 5, 6), array(7, 8, 9));

  for ($row = 0; $row < 3; $row++)

  {

  echo "";

  for ($col = 0; $col < 3; $col++)

  {

  echo $table[$row][$col];

  }

  }

  for ($row = 0; $row < 3; $row++)

  {

  for ($col = 0; $col < 3; $col++)

  {

  $table[$row][$col] = $table[$row][$col] + 1;

  }

  }

  for ($row = 0; $row < 3; $row++)

  {

  echo "";

  for ($col = 0; $col < 3; $col++)

  {

  echo $table[$row][$col];

  }

  }

  ?>

• 7

  Save the file on the server with the name grid.php and access it in a Web browser. The page shows the original grid and the edited grid.