How to get the value of a two-dimensional array in php

In PHP, a two-dimensional array is an array containing one or more arrays, where each sub-array has its own key and value. To get the values ​​of a 2D array, you have to choose between an outer loop that iterates over each subarray, and an inner loop that iterates over the keys and values ​​in each subarray.

The following are several ways to obtain the value of a two-dimensional array:

1. foreach loop

You can use a foreach loop to obtain the value of a two-dimensional array. You can use a foreach statement in an outer loop to iterate through each sub-array in the main array. And inside the inner loop, you can use another foreach loop to iterate over the keys and values ​​in each sub-array.

Sample code:

<?php 
$grades = array( 
   array("Maths", 85), 
   array("English", 82), 
   array("Science", 90) 
); 

foreach ($grades as $subject) { 
   echo $subject[0].": ".$subject[1]."<br>"; 
} 
?>

Result:

Maths: 85
English: 82
Science: 90

2. for loop

You can use a for loop to obtain the value of a two-dimensional array . In the outer loop, the for statement iterates through each sub-array in the main array. Within the inner loop, you can use a for loop to iterate over the keys and values ​​in each sub-array.

Sample code:

<?php 
$grades = array( 
   array("Maths", 85), 
   array("English", 82), 
   array("Science", 90) 
); 

for ($row = 0; $row < count($grades); $row++) { 
   echo $grades[$row][0].": ".$grades[$row][1]."<br>"; 
} 
?>

Result:

Maths: 85
English: 82
Science: 90

3. while loop

You can use a while loop to obtain the value of a two-dimensional array . In the outer loop, use a while statement to loop through each sub-array in the main array. Within the inner loop, you can use another while loop to iterate over the keys and values ​​in each sub-array.

Sample code:

<?php 
$grades = array( 
   array("Maths", 85), 
   array("English", 82), 
   array("Science", 90) 
); 

$row = 0; 
while ($row < count($grades)) { 
   $col = 0; 
   while ($col < count($grades[$row])) { 
      echo $grades[$row][$col]." "; 
      $col++; 
   } 
   echo "<br>"; 
   $row++; 
} 
?>

Result:

Maths 85
English 82
Science 90

Summary

The above are three methods of obtaining two-dimensional array values. Among them, the foreach loop is suitable for traversing small two-dimensional arrays, while using the for loop is suitable for larger arrays. The use of while loops is suitable for situations where other operations need to be performed within the inner loop.

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