Whether a certain value is in the array value range php

When writing PHP code, we often need to check whether a specific value is within the range of an array value. This operation is relatively common, so it is necessary to learn how to complete it concisely and effectively. In this article, we will introduce a commonly used method to determine whether a value is within the range of array values.

We can use the following code to determine whether a value $value is within the value range of an array $range:

function isInRange($value, $range) {
   sort($range);  //将数组升序排列
   $min = $range[0];
   $max = end($range);
   return ($value >= $min) && ($value <= $max);  //判断$value是否在区间内
}

First, we sort the array $range in ascending order, which ensures The minimum value of the array is at the front and the maximum value is at the end. Next, we defined variables $min and $max respectively to record the minimum and maximum values ​​of the array $range.

Finally, we use the ($value >= $min) && ($value <= $max) expression to determine whether $value is within the range of $range array values. If the expression is true, it means that the value $value is within the value range of the array $range, and returns true; otherwise, returns false.

An example calling method:

$range = array(5, 10, 15, 20, 25);
$value = 12;
if (isInRange($value, $range)) {
   echo "值在数组值区间内";
} else {
   echo "值不在数组值区间内";
}

In this example, the values ​​of the $range array are 5, 10, 15, 20, 25, and the $value is 12. By running the calling method isInRange($value, $range), we can know that 12 is within the value range of the $range array, so "the value is within the array value range" is output.

The above method is simple, easy to understand, and can be applied to many situations, making it very practical. No matter what the occasion, you can easily use this method to check whether the value is within the array value range.

Finally, one thing to note is that when using this method, we need to pass in a sorted array $range. If the sorted array is not passed in, an error will occur when the code is run. Therefore, when using this method, we must first consider the array to be sorted before using it to test, so that we can get accurate results.

In short, this is an extremely simple and effective method that can help us easily determine whether a specific value is within the range of an array value. If you need to do something similar, try the method described in this article now!

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