PHP Array Exercises : Floor decimal numbers with precision

Last update on May 30 2022 11:48:21 (UTC/GMT +8 hours)

PHP Array: Exercise-18 with Solution

Write a PHP function to floor decimal numbers with precision.

Note: Accept three parameters number, precision, and $separator
Sample Data :
1.155, 2, "."
100.25781, 4, "."
-2.9636, 3, "."

Sample Solution:

PHP Code:

<?php
function floorDec($number, $precision, $separator)
{
$number_part=explode($separator, $number);
$number_part[1]=substr_replace($number_part[1],$separator,$precision,0);
if($number_part[0]>=0)
{$number_part[1]=floor($number_part[1]);}
else
{$number_part[1]=ceil($number_part[1]);}

$ceil_number= array($number_part[0],$number_part[1]);
return implode($separator,$ceil_number);
}
print_r(floorDec(1.155, 2, ".")."\n");
print_r(floorDec(100.25781, 4, ".")."\n");
print_r(floorDec(-2.9636, 3, ".")."\n");
?>

Sample Output:

1.15                                                        
100.2578                                                    
-2.964

Flowchart:

PHP Code Editor:

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Previous: Write a PHP function that returns the lowest integer that is not 0.
Next: Write a PHP script to print "second" and Red from the specified array.

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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