PHP 7

[Tsygankov-Slava]

PHP 7.x added a lot of different things and changed a lot of behaviors.
This issue is tracking the status of PHP 7 implementation in KPHP.

The following emoji will be used to denote the task status:

• 🔆 — high priority
• 🔅 — low priority
• 🔸 — breaks backward compatibility
• 🔺 — will not be changed in KPHP
• ⏳ — syntax is supported at the parser level
• 🔨 - in progress

PHP 7

Added

New syntax

• Null Coalesce Operator (RFC)
• Combined Comparison (Spaceship) Operator $a <=> $b (RFC)
• Group Use Declarations use name\space\{A, B, C as c} (RFC)
• New types of function/method parameters int, float, bool (RFC)
• Types of function/method return int, float, bool, array (RFC)
• Anonymous Classes $class = new class{} (RFC) | 🔨 Add support for anonymous classes #273
• ⏳ Generator Return Expressions yield ... return 99 (RFC) | 🔨
• ⏳ Generator Delegation yield from func() (RFC) | 🔨

Other

• Array in define define( 'FOO', [1,2] ) (RFC)

Changed

• Fix "foreach" behavior (RFC)

PHP 7.1

Added

New syntax

• Nullable type ?int (RFC)
• Return type void (RFC)
• Square bracket syntax for array destructuring assignment ['key'=>$var] = ['key'=>'Значение'] (RFC)
• Key support in list() list( 'id'=>$id ) = $data (RFC)
• ⏳ New pseudo-type iterable (RFC) | 🔨
• Generalize support of negative string offsets$string[-1] (RFC)
• ⏳ Catching Multiple Exception Types catch (First | Second $e) (RFC) | 🔨

Other

• New static Closure method Closure::fromCallable() (RFC)
• Scope of constants in classes private const (RFC)

PHP 7.2

Added

New syntax

• Trailing Commas In List Syntax (RFC)

PHP 7.3

Added

New syntax

• ⏳ Links in list list( &$a ) (RFC) | 🔨

Other

• is_countable() (RFC)
• array_(key|value)_(first|last)() (RFC && RFC)

Changed

• Flexible Heredoc and Nowdoc Syntaxes (RFC)

PHP 7.4

Added

New syntax

• Spread Operator in Array Expression [ ...$arr ] (RFC)
• Null Coalescing Assignment Operator ??= (RFC)
• Numeric Literal Separator 299_792 (RFC)

Other

• Covariant Returns and Contravariant Parameters (RFC)
• strip_tags( $str, ['a', 'p'] ) (RFC)
• __serialize() __unserialize() (RFC && RFC)
• Call array_merge without arguments array_merge() (RFC)
• Allow throwing exceptions from __toString() (RFC)
• Weak References (RFC)

Changed

• Typed Properties 2.0 public int $id (RFC)
• Arrow Functions 2.0 fn( $x ) => $x (RFC)