如何在 PHP 中检查整数是否在一个数字范围内？

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if (($num >= $lower_boundary) && ($num <= $upper_boundary)) {

You may want to adjust the comparison operators if you want the boundary values not to be valid.

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最佳答案

The expression:

 ($min <= $value) && ($value <= $max)

will be true if $value is between $min and $max, inclusively

See the PHP docs for more on comparison operators

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You can use filter_var

filter_var(
$yourInteger,
FILTER_VALIDATE_INT,
array(
'options' => array(
'min_range' => $min,
'max_range' => $max
)
)
);

This will also allow you to specify whether you want to allow octal and hex notation of integers. Note that the function is type-safe. 5.5 is not an integer but a float and will not validate.

Detailed tutorial about filtering data with PHP:

https://phpro.org/tutorials/Filtering-Data-with-PHP.html

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using a switch case

    switch ($num){


case ($num>= $value1 && $num<= $value2):
echo "within range 1";
break;
case ($num>= $value3 && $num<= $value4):
echo "within range 2";
break;
.
.
.
.
.


default: //default
echo "within no range";
break;
}

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function limit_range($num, $min, $max)
{
// Now limit it
return $num>$max?$max:$num<$min?$min:$num;
}


$min = 0;  // Minimum number can be
$max = 4;  // Maximum number can be
$num = 10;  // Your number
// Number returned is limited to be minimum 0 and maximum 4
echo limit_range($num, $min, $max); // return 4
$num = 2;
echo limit_range($num, $min, $max); // return 2
$num = -1;
echo limit_range($num, $min, $max); // return 0

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You can try the following one-statement:

if (($x-$min)*($x-$max) < 0)

or:

if (max(min($x, $max), $min) == $x)

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You could whip up a little helper function to do this:

/**
* Determines if $number is between $min and $max
*
* @param  integer  $number     The number to test
* @param  integer  $min        The minimum value in the range
* @param  integer  $max        The maximum value in the range
* @param  boolean  $inclusive  Whether the range should be inclusive or not
* @return boolean              Whether the number was in the range
*/
function in_range($number, $min, $max, $inclusive = FALSE)
{
if (is_int($number) && is_int($min) && is_int($max))
{
return $inclusive
? ($number >= $min && $number <= $max)
: ($number > $min && $number < $max) ;
}


return FALSE;
}

And you would use it like so:

var_dump(in_range(5, 0, 10));        // TRUE
var_dump(in_range(1, 0, 1));         // FALSE
var_dump(in_range(1, 0, 1, TRUE));   // TRUE
var_dump(in_range(11, 0, 10, TRUE)); // FALSE


// etc...

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Another way to do this with simple if/else range. For ex:

$watermarkSize = 0;


if (($originalImageWidth >= 0) && ($originalImageWidth <= 640)) {
$watermarkSize = 10;
} else if (($originalImageWidth >= 641) && ($originalImageWidth <= 1024)) {
$watermarkSize = 25;
} else if (($originalImageWidth >= 1025) && ($originalImageWidth <= 2048)) {
$watermarkSize = 50;
} else if (($originalImageWidth >= 2049) && ($originalImageWidth <= 4096)) {
$watermarkSize = 100;
} else {
$watermarkSize = 200;
}

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Some other possibilities:

if (in_array($value, range($min, $max), true)) {
echo "You can be sure that $min <= $value <= $max";
}

Or:

if ($value === min(max($value, $min), $max)) {
echo "You can be sure that $min <= $value <= $max";
}

Actually this is what is use to cast a value which is out of the range to the closest end of it.

$value = min(max($value, $min), $max);

Example

/**
* This is un-sanitized user input.
*/
$posts_per_page = 999;


/**
* Sanitize $posts_per_page.
*/
$posts_per_page = min(max($posts_per_page, 5), 30);


/**
* Use.
*/
var_dump($posts_per_page); // Output: int(30)

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Might help:

if ( in_array(2, range(1,7)) ) {
echo 'Number 2 is in range 1-7';
}

http://php.net/manual/en/function.range.php

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I created a function to check if times in an array overlap somehow:

    /**
* Function to check if there are overlapping times in an array of \DateTime objects.
*
* @param $ranges
*
* @return \DateTime[]|bool
*/
public function timesOverlap($ranges) {
foreach ($ranges as $k1 => $t1) {
foreach ($ranges as $k2 => $t2) {
if ($k1 != $k2) {
/* @var \DateTime[] $t1 */
/* @var \DateTime[] $t2 */
$a = $t1[0]->getTimestamp();
$b = $t1[1]->getTimestamp();
$c = $t2[0]->getTimestamp();
$d = $t2[1]->getTimestamp();


if (($c >= $a && $c <= $b) || $d >= $a && $d <= $b) {
return true;
}
}
}
}


return false;
}

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Here is my little contribution:

function inRange($number) {
$ranges = [0, 13, 17, 24, 34, 44, 54, 65, 200];
$n = count($ranges);


while($n--){
if( $number > $ranges[$n] )
return $ranges[$n]+1 .'-'. $ranges[$n + 1];
}

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$ranges = [
1 => [
'min_range' => 0.01,
'max_range' => 199.99
],
2 => [
'min_range' => 200.00,
],
];


foreach($ranges as $value => $range){
if(filter_var($cartTotal, FILTER_VALIDATE_FLOAT, ['options' => $range])){
return $value;
}
}

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Thank you so much and I got my answer by adding a break in the foreach loop and now it is working fine.

Here are the updated answer:

foreach ($this->crud->getDataAll('shipping_charges') as $ship) {
if ($weight >= $ship->low && $weight <= $ship->high) {
$val = $ship->amount;
break;
}
else
{
$val = 900;
}
}
echo $val ;

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I have function for my case

Use:

echo checkRangeNumber(0);
echo checkRangeNumber(1);
echo checkRangeNumber(499);
echo checkRangeNumber(500);
echo checkRangeNumber(501);
echo checkRangeNumber(3001);
echo checkRangeNumber(999);

//return

function checkRangeNumber($number, $per_page = 500)
{
//$per_page = 500; // it's fixed number, but...


if ($number == 0) {
return "0";
}


$num_page = ceil($number / $per_page); // returns 65
$low_limit = ($num_page - 1) * $per_page + 1; // returns 32000
$up_limit = $num_page * $per_page; // returns 40
return  "$low_limit-$up_limit";
}

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I've created a simple helper function.

if ( !function_exists('number_between') )
{
/**
* number_between
*
* @param {integer} $number
* @param {array} $range [min, max]
* @return {boolean}
*/
function number_between(
int $number,
array $range
){
        

if(
count($range) !== 2 ||
is_numeric($range[0]) === FALSE ||
is_numeric($range[1]) === FALSE
){
throw new \Exception("number_between second parameter must contain two numbers.", E_WARNING);
}
        

if(
in_array($number, range($range[0], $range[1]))
){
return TRUE;
}else{
return FALSE;
}
}
    

}