Posted in php
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12:13 am, March 22, 2019

calculate a percentage (dec) difference based on two numbers

this function will show you the percentage difference between two numbers

PHP

// calc_percentage_dec.php

$template_result = "";

// function - calc_percentage_dec($total, $diff)
function calc_percentage_dec($total, $diff) {
  $dec = $total - $diff;
  return $dec_percent = ( $dec / $total ) * 100;
}   

// Usage examples, as shown in demo.:

// total
$total = 2406;
$diff = 356;

// % difference
$perc_diff = calc_percentage_dec($total, $diff);
$perc_diff_rounded = number_format($perc_diff, 2);

$template_result .= "<p>The percentage difference between <b>$total</b> and <b>$diff</b> is <b>$perc_diff%</b></p>";
$template_result .= "<p>You can round this number down using number_format($perc_diff, 2) which should give you <b>$perc_diff_rounded</b></p>";

// and another more simple one to test the numbers are calculating correctly

// total
$total = 100;
$diff = 50;
$perc_diff = calc_percentage_dec($total, $diff);

$template_result .= "<p>The percentage difference between $total and $diff is: $perc_diff%</p>";

The percentage difference between 2406 and 356 is 85.20365752286%

You can round this number down using number_format(85.20365752286, 2) which should give you 85.20

The percentage difference between 100 and 50 is: 50%

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