检查范围内的值或不是PHP

Question

I want to check value with in range or not suppose if I have range D1 to D40 and if I enter D20 then it returns value with in range.

I check several solution but this are for only integer not for both string and integer.

EDIT

Range will be dynamic like AA20 to AA30 or like AC10D to AC30D

Answer 1

You can write something simpler like this...

$arr = range(1,40); //<--- Creating a range of 1 to 40 elements..
array_walk($arr,function (&$v){ $v = 'D'.$v;}); //<--- Concatenating D to all the elements..
echo in_array('D20',$arr) ? 'Found' : 'Not Found'; //<-- The search part.

Demonstration

Answer 2

First, you should remove the letter D from your string variable, like this:

// This is your first variable:
$rang1="D5";

// This is your second rang variable:
$rang2="D20";

$rang1=str_replace("D","",$rang1);
$rang2=str_replace("D","",$rang2);
$rang=$rang2-$rang1;
echo $rang;

---

Or if your variable looks like this:

$rang="D5 TO D20";

you can use the following:

$rang="D5 TO D20";
$rang=explode(" TO ",$rang);
$rang1=rang[0];
$rang2=rang[1];

$rang1=str_replace("D","",$rang1);
$rang2=str_replace("D","",$rang2);
$rang=$rang2-$rang1;
echo $rang;

Answer 3

// 1. build up array of valid entries
$prefix = "D";
$rangeArray = array();
for($i = 1; $i <= 40; $i++) {
    $rangeArray[] = $prefix . $i;
}

...

// 2. check against that array:
$inRange = in_array($needle, $rangeArray); // boolean

To get the position in the range:

$pos = array_search($needle, $rangeArray); // integer or false if not found

Where $needle would be your input value.

Answer 4

The following code will work with ranges with different letter in the beginning like A10 to B30 (assuming A20 is in that range, but A40 is not) :

$min = "A10";
$max = "B30";
$test = "A20";

$min_ascii = chr($min[0]);
$max_ascii = chr($max[0]);
$test_ascii = chr($max[0]);

$min_number = substr($min, 1);
$max_number = substr($max, 1);
$test_number = substr($test, 1);

if ($min_ascii <= $test_ascii and $test_ascii <= $max_ascii
    and $min_number <= $test_number and $test_number <= $max_number)
{
    echo "$test is in the range from $min to $max";
}