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PHP Array Exercises : Display array values within a string

PHP Array: Exercise-1 with Solution

$color = array('white', 'green', 'red', 'blue', 'black');
Write a script which will display the following string
"The memory of that scene for me is like a frame of film forever frozen at that moment: the red carpet, the green lawn, the white house, the leaden sky. The new president and his first lady. - Richard M. Nixon"
and the words 'red', 'green' and 'white' will come from $color.

Sample Solution:

PHP Code:

<?php
$color = array('white', 'green', 'red', 'blue', 'black');
echo "The memory of that scene for me is like a frame of film forever frozen at that moment: the $color[2] carpet, the $color[1] lawn, the $color[0] house, the leaden sky. The new president and his first lady. - Richard M. Nixon"."\n";
?>

Sample Output: 

The memory of that scene for me is like a frame of film fore
ver frozen at that moment: the red carpet, the green lawn, t
he white house, the leaden sky. The new president and his fi
rst lady. - Richard M. Nixon

Flowchart:

Flowchart: Display array values within a string

PHP Code Editor:

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PHP: Tips of the Day

How to Sort Multi-dimensional Array by Value?

Try a usort, If you are still on PHP 5.2 or earlier, you'll have to define a sorting function first:

Example:

function sortByOrder($a, $b) {
    return $a['order'] - $b['order'];
}

usort($myArray, 'sortByOrder');

Starting in PHP 5.3, you can use an anonymous function:

usort($myArray, function($a, $b) {
    return $a['order'] - $b['order'];
});

And finally with PHP 7 you can use the spaceship operator:

usort($myArray, function($a, $b) {
    return $a['order'] <=> $b['order'];
});

To extend this to multi-dimensional sorting, reference the second/third sorting elements if the first is zero - best explained below. You can also use this for sorting on sub-elements.

usort($myArray, function($a, $b) {
    $retval = $a['order'] <=> $b['order'];
    if ($retval == 0) {
        $retval = $a['suborder'] <=> $b['suborder'];
        if ($retval == 0) {
            $retval = $a['details']['subsuborder'] <=> $b['details']['subsuborder'];
        }
    }
    return $retval;
});

If you need to retain key associations, use uasort() - see comparison of array sorting functions in the manual

Ref : https://bit.ly/3i77vCC