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:

start <= value <= end

For example:

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

2. Use the range operator

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

start ... end

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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