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@jonathanlaf
Last active August 14, 2018 12:54
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[Closest value operator] Get closest value (of an array) before a given one #php #operand
<?php
function valueExpected ($analyse, $expect, $strict = false)
{
if ($strict)
{
if ($analyse === $expect)
{
return '<span style="background-color:darkolivegreen; color:darkgrey;">Received : ' .
$analyse .
', Expected : ' .
$expect .
' > Test->Passed</span>';
}
}
if (!$strict)
{
if ($analyse == $expect)
{
return '<span style="background-color:darkolivegreen; color:darkgrey;">Received : ' .
$analyse .
', Expected : ' .
$expect .
' > Test->Passed</span>';
}
}
return '<span style="background-color:lightcoral; color:black;">Received : ' .
$analyse .
', Expected : ' .
$expect .
' > Test->Failed</span>';
}
function getClosestLowerValue ($search, $haystack)
{
$closest = null;
$testStack = $haystack;
$TotalLoop = count($testStack);
//Removed higher value again tested value in $testStack
for ($i = 0; $TotalLoop > $i; $i++)
{
if ($testStack[ $i ] > $search)
{
unset($testStack[ $i ]);
}
}
//If no value left in $testStack, rerun function with a search greater by twelve (searching for month) to move position on "infinite timeline"
if (empty($testStack))
{
$search = $search + 12;
return getClosestLowerValue($search, $haystack);
}
else
{
//Since $testStack was not empty, we asume that maybe some key been removed, so we reassign position for a clean for loop.
$haystack = array_values($testStack);
$TotalLoop = count($haystack);
//Search for the nearest value
for ($i = 0; $TotalLoop > $i; $i++)
{
if ($closest === null || abs($search - $closest) > abs($haystack[ $i ] - $search))
{
$closest = $haystack[ $i ];
}
}
return $closest;
}
}
echo 'Testing 01 > ' . valueExpected(getClosestLowerValue(1, array (1, 5, 9, 12)), 1) . '<br>';
echo 'Testing 02 > ' . valueExpected(getClosestLowerValue(2, array (1, 5, 9, 12)), 1) . '<br>';
echo 'Testing 03 > ' . valueExpected(getClosestLowerValue(3, array (1, 5, 9, 12)), 1) . '<br>';
echo 'Testing 04 > ' . valueExpected(getClosestLowerValue(4, array (1, 5, 9, 12)), 1) . '<br>';
echo 'Testing 05 > ' . valueExpected(getClosestLowerValue(5, array (1, 5, 9, 12)), 5) . '<br>';
echo 'Testing 06 > ' . valueExpected(getClosestLowerValue(6, array (1, 5, 9, 12)), 5) . '<br>';
echo 'Testing 07 > ' . valueExpected(getClosestLowerValue(7, array (1, 5, 9, 12)), 5) . '<br>';
echo 'Testing 08 > ' . valueExpected(getClosestLowerValue(8, array (1, 5, 9, 12)), 5) . '<br>';
echo 'Testing 09 > ' . valueExpected(getClosestLowerValue(9, array (1, 5, 9, 12)), 9) . '<br>';
echo 'Testing 10 > ' . valueExpected(getClosestLowerValue(10, array (1, 5, 9, 12)), 9) . '<br>';
echo 'Testing 11 > ' . valueExpected(getClosestLowerValue(11, array (1, 5, 9, 12)), 9) . '<br>';
echo 'Testing 12 > ' . valueExpected(getClosestLowerValue(12, array (1, 5, 9, 12)), 12) . '<br>';
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