How to take user input for two dimensional (2D) array in PHP ?
Last Updated : 28 Apr, 2023
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There are two methods to take user input in PHP in two dimensional (2D) array.
Approach 1:
- Use HTML forms through PHP GET & POST method to take user input in two dimensional (2D) array.
- First, input data into HTML forms.
- Then use the GET or POST method of PHP to get or post those input data into a variable.
- Finally, use that variable that holds input data and process using for loop.
- Though it is from a two-dimensional array so, you need two indices/variables for processing in for loop.
- Enter input one below another to state as two variables.
Example 1: Below example illustrate how to input user data for 2D-array using the Form POST method.
<?php
echo "Enter n for nxn : <br>";
echo "<form method='POST'>
Row:<input type='number' min='2'
max='5' name='1d' value='1'/>
Column:<input type='number' min='2'
max='5' name='2d' value='1'/>
<input type='submit' name='submit'
value='Submit'/>
</form>";
// Submit user input data for 2D array
if (isset($_POST['submit'])) {
// POST submitted data
$dimention1 = $_POST["1d"];
// POST submitted data
$dimention2 = $_POST["2d"];
echo "Entered 2d nxn: " . $dimention1
. "x" . $dimention2 . " <br>";
$d = [];
$k = 0;
for($row = 0; $row < $dimention1; $row++) {
for ($col = 0; $col < $dimention2; $col++) {
$d[$row][$col]= $k++;
}
}
for ($row = 0; $row < $dimention1; $row++) {
for ($col = 0; $col < $dimention2; $col++) {
echo $d[$row][$col]." ";
}
echo "<br>";
}
}
?>
Output:
Approach 2:
- To take user input in PHP for two dimensional (2D) by using fopen() function which helps to get user input either at runtime or by the external input file.
- First, assign those input data to variables.
- Finally, use those variables which hold input data and process using for loop.
- Though it is from a two-dimensional array so, you need two indices/variables for processing in for loop.
Example: Below example illustrates how to input user data for a 2D array using fopen() function.
<?php
// fopen() using standard input
$stdin = fopen('php://stdin', 'r');
?>
<?php
error_reporting(0);
echo "\n\n\nEnter row and column: \n";
// Right trim fgets(user input)
$dimention1 = rtrim(fgets($stdin));
// Right trim fgets(user input)
$dimention2 = rtrim(fgets($stdin));
echo "Entered row and column: " .
$dimention1 . "x" . $dimention1 . " \n";
$d = [];
$k = 0;
for ($row = 0; $row < $dimention1; $row++) {
for ($col = 0; $col < $dimention2; $col++) {
$d[$row][$col]= $k++;
}
}
for ($row = 0; $row < $dimention1; $row++) {
for ($col = 0; $col < $dimention2; $col++) {
echo $d[$row][$col]." ";
}
echo "\n";
}
?>
Output:
Reference: https://www.geeksforgeeks.org/php-fopen-function-open-file-or-url/
