Nested foreach in PHP

In this tutorial, you shall learn how to write nested foreach statements in PHP, with the help of example programs.

PHP – Nested foreach

Nested foreach is a statement in which we have a foreach as statement inside a foreach.

Nested foreach can used to iterate over values of multidimensional arrays in PHP.

Examples (2)

1. Iterate over 2D Indexed Array using nested foreach

Let us take a two-dimensional array, and use nested foreach to traverse the elements of the array.

PHP Program

<?php
$array2D = array(
    array(7, 8, 9),
    array(4, 5, 6),
    array(1, 2, 3)
);

foreach ($array2D as $array1D) {
    foreach ($array1D as $element) {
        echo $element;
        echo " ";
    }
    echo "<br>";
}
?>

Output

2. Iterate over an Associative Array where the values are Arrays using foreach

In the following program, we take a two dimensional array and iterate over the elements in inner-arrays using nested foreach statement.

PHP Program

<?php
$arr = array(
    "a" => array( 41, 96, 65 ),
    "b" => array( 88, 44, 22 ),
    "c" => array( 12, 23, 34 )
);

foreach ($arr as $key => $value) {
    echo $key . '<br>';
    foreach ($value as $element) {
        echo $element . ' ';
    }
    echo '<br>';
}
?>

Output

Conclusion

In this PHP Tutorial, we learned what a nested foreach statement is, and how to use this statement to iterate over a multidimensional array.