How is the php match function used?

The match function in PHP is a new feature introduced in PHP 8 that is used to match expressions and execute corresponding code blocks based on the match result. It is similar to a switch statement, but more flexible and expressive.

The basic syntax of the match function is as follows:

match ($value) {
    pattern1 => expression1,
    pattern2 => expression2,
    // more patterns and expressions
    default => defaultExpression,
}

The value to be matched is represented by $value, pattern1, pattern2, etc. are the matching patterns, expression1, expression2, etc. are the expressions to be executed when matching with the corresponding pattern, default is the optional default case, and defaultExpression is the expression to be executed when no pattern is matched.

For example:

$value = 2;

$result = match ($value) {
    1 => 'One',
    2 => 'Two',
    3 => 'Three',
    default => 'Other',
};

echo $result; // 输出：Two

In this example, if the value of $value is 1, output “One”; if the value of $value is 2, output “Two”; if the value of $value is 3, output “Three”; if the value of $value is not any of 1, 2, or 3, output “Other”.

The match function allows matching with values of any type and supports various pattern matching methods such as constants, expressions, types, regular expressions, etc. Using the match function, developers can handle complex conditional logic more concisely and clearly.