How to express a range of values ​​in php

There are two ways to express range in PHP: Between operator: start <= value <= end (inclusive range) Range operator: start ... end (exclusive range, only applicable to PHP 5.3 and later, and only for numeric types)

Methods for representing ranges in PHP

PHP The range of a value can be expressed in two ways:

1. Use the between operator

The syntax of the between operator (inclusive range) is:

<code class="php">start <= value <= end</code>

For example:

<code class="php">if ($age >= 18 && $age <= 65) {
    // 18 岁到 65 岁之间的成年人
}</code>

2. Use the range operator

The syntax of the range operator (exclusive range) is:

<code class="php">start ... end</code>

For example:

if ($age >= 18 && $age < 65) {
    // 不包括 65 岁，18 岁到 64 岁之间的成年人
}

Note: 

The range operator is only available in PHP 5.3 and above. 
For floating point numbers, the range operator will return false even if the number is within the range. 
The between operator can be used with strings, numbers, and datetime objects. 
Range operators can only be used with numeric types such as integers and floating point numbers. 

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