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    himanshidalal74
    There are three types of arrays in PHP: indexed arrays which use numeric indexes; associative arrays which use named keys; and multidimensional arrays which contain one or more arrays. Indexed arrays can be automatically indexed starting from 0 or manually assigned indexes. Associative arrays use named keys assigned to values. Multidimensional arrays contain nested arrays and require multiple indexes to access elements.

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    Notes

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    There are three types of arrays in PHP: indexed arrays which use numeric indexes; associative arrays which use named keys; and multidimensional arrays which contain one or more arrays. Indexed arrays can be automatically indexed starting from 0 or manually assigned indexes. Associative arrays use named keys assigned to values. Multidimensional arrays contain nested arrays and require multiple indexes to access elements.

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    There are three types of arrays in PHP: indexed arrays which use numeric indexes; associative arrays which use named keys; and multidimensional arrays which contain one or more arrays. Indexed arrays can be automatically indexed starting from 0 or manually assigned indexes. Associative arrays use named keys assigned to values. Multidimensional arrays contain nested arrays and require multiple indexes to access elements.

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    Download as docx, pdf, or txt
    16 views5 pages

    Notes

    Uploaded by

    himanshidalal74
    There are three types of arrays in PHP: indexed arrays which use numeric indexes; associative arrays which use named keys; and multidimensional arrays which contain one or more arrays. Indexed arrays can be automatically indexed starting from 0 or manually assigned indexes. Associative arrays use named keys assigned to values. Multidimensional arrays contain nested arrays and require multiple indexes to access elements.

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    of 5

    In PHP, there are three types of arrays:

     Indexed arrays - Arrays with a numeric index


     Associative arrays - Arrays with named keys
     Multidimensional arrays - Arrays containing one or more arrays

    PHP Indexed Arrays


    PHP Indexed Arrays
    There are two ways to create indexed arrays:

    The index can be assigned automatically (index always starts at 0), like this:

    $cars = array("Volvo", "BMW", "Toyota");

    or the index can be assigned manually:

    $cars[0] = "Volvo";
    $cars[1] = "BMW";
    $cars[2] = "Toyota";

    The following example creates an indexed array named $cars, assigns three
    elements to it, and then prints a text containing the array values:

    ExampleGet your own PHP Server


    <?php
    $cars = array("Volvo", "BMW", "Toyota");
    echo "I like " . $cars[0] . ", " . $cars[1] . " and " . $cars[2] . ".";
    ?>

    Try it Yourself »
    Loop Through an Indexed Array
    To loop through and print all the values of an indexed array, you could use
    a for loop, like this:

    Example
    <?php
    $cars = array("Volvo", "BMW", "Toyota");
    $arrlength = count($cars);

    for($x = 0; $x < $arrlength; $x++) {


    echo $cars[$x];
    echo "<br>";
    }
    ?>

    PHP Associative Arrays


    PHP Associative Arrays
    Associative arrays are arrays that use named keys that you assign to them.

    There are two ways to create an associative array:

    $age = array("Peter"=>"35", "Ben"=>"37", "Joe"=>"43");

    or:

    $age['Peter'] = "35";
    $age['Ben'] = "37";
    $age['Joe'] = "43";

    The named keys can then be used in a script:


    ExampleGet your own PHP Server
    <?php
    $age = array("Peter"=>"35", "Ben"=>"37", "Joe"=>"43");
    echo "Peter is " . $age['Peter'] . " years old.";
    ?>

    Try it Yourself »

    Loop Through an Associative Array


    To loop through and print all the values of an associative array, you could use
    a foreach loop, like this:

    Example
    <?php
    $age = array("Peter"=>"35", "Ben"=>"37", "Joe"=>"43");

    foreach($age as $x => $x_value) {


    echo "Key=" . $x . ", Value=" . $x_value;
    echo "<br>";
    }
    ?>

    PHP Multidimensional Arrays


    PHP - Multidimensional Arrays
    A multidimensional array is an array containing one or more arrays.

    PHP supports multidimensional arrays that are two, three, four, five, or more
    levels deep. However, arrays more than three levels deep are hard to manage
    for most people.

    The dimension of an array indicates the number of indices you need to


    select an element.
     For a two-dimensional array you need two indices to select an element
     For a three-dimensional array you need three indices to select an element

    PHP - Two-dimensional Arrays


    A two-dimensional array is an array of arrays (a three-dimensional array is an
    array of arrays of arrays).

    First, take a look at the following table:

    Name Stock

    Volvo 22

    BMW 15

    Saab 5

    Land Rover 17

    We can store the data from the table above in a two-dimensional array, like
    this:

    $cars = array (
    array("Volvo",22,18),
    array("BMW",15,13),
    array("Saab",5,2),
    array("Land Rover",17,15)
    );
    Now the two-dimensional $cars array contains four arrays, and it has two
    indices: row and column.

    To get access to the elements of the $cars array we must point to the two
    indices (row and column):

    ExampleGet your own PHP Server


    <?php
    echo $cars[0][0].": In stock: ".$cars[0][1].", sold: ".$cars[0]
    [2].".<br>";
    echo $cars[1][0].": In stock: ".$cars[1][1].", sold: ".$cars[1]
    [2].".<br>";
    echo $cars[2][0].": In stock: ".$cars[2][1].", sold: ".$cars[2]
    [2].".<br>";
    echo $cars[3][0].": In stock: ".$cars[3][1].", sold: ".$cars[3]
    [2].".<br>";
    ?>

    <?php
    for ($row = 0; $row < 4; $row++) {
    echo "<p><b>Row number $row</b></p>";
    echo "<ul>";
    for ($col = 0; $col < 3; $col++) {
    echo "<li>".$cars[$row][$col]."</li>";
    }
    echo "</ul>";
    }
    ?>

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