How to validate an integer within a range in PHP
Problem statement: Given an integer, check if that integer is within the given range.
Example 1
- Input:
num=5,range=[3,10] - Output:
true
Example 2
- Input:
num=12,range=[3,10] - Output:
false
The filter_var() function
The filter_var() function in PHP is used to validate/filter a variable according to the specified filter.
Syntax
filter_var(var, filtername, options)
Parameters
var: The variable to be evaluated.filtername: The name of the filter to use. This is an optional parameter.options: Flags/options to use. This is an optional parameter.
Return value
The method returns the filtered data on successful. Otherwise, it returns false on failure.
The FILTER_VALIDATE_INT filter
The FILTER_VALIDATE_INT filter is used to check if the value is an integer. The filter optionally accepts a range when specified checks if the given integer value is within the range.
The options to specify for range check are as follows:
min_range: This specifies the minimum value in the integer range.max_range: This specifies the maximum value in the integer range.
By combining filter_var() and FILTER_VALIDATE_INT, we can check if the given number is within the given range.
Example
<?php$range = array('min_range' => 3, 'max_range' => 10,);$options = array('options' => $range);$num = 7;if (filter_var($num, FILTER_VALIDATE_INT, $options) == false){echo $num." is not in range ";print_r($range);} else{echo $num." is in range ";print_r($range);}?>
Explanation
- Line 3: We define the range as an array.
- Line 5: We construct the options parameter using the range array from line 3.
- Line 7: We define the number that we have to validate.
- Lines 9–15: We validate the number within the range using the
filter_var()function and theFILTER_VALIDATE_INTfilter. Depending on the result, we print a string.
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