Pattern matching

[thekid]

Rough draft:

// Type checks, already possible today
$value is int;

// Literal checks
$value is 1;

// Omitting values
$value is [, $second];

// Deconstruction 
$value is Person(name: $name);

See also:

• Pattern matching iluuu1994/php-src#102
• Pattern matching Kotlin/KEEP#213
• https://openjdk.org/jeps/441 (including "Future work" section)