PHP 8.0
Named Arguments
Constructor Property Promotion
first_name; // Rasmus
]]>
Nullsafe Operator with short-circuiting
Similar to |008822|?.| operator in Javascript, C# and Swift
user?->getAddress(geoip())?->country;
// instead of
if ($session !== null) {
$user = $session->user;
if ($user !== null) {
$address = $user->getAddress(geoip());
if ($address !== null) {
$country = $address->country;
}
}
}
]]>
Match Expression
lexer->lookahead['type']) {
Lexer::T_SELECT => $this->SelectStatement(),
Lexer::T_UPDATE => $this->UpdateStatement(),
Lexer::T_DELETE => $this->DeleteStatement(),
default => $this->syntaxError('SELECT, UPDATE or DELETE'),
};
// Throws UnhandledMatchError on no match and no default expr
// instead of
switch ($this->lexer->lookahead['type']) {
case Lexer::T_SELECT:
$statement = $this->SelectStatement();
break;
case Lexer::T_UPDATE:
$statement = $this->UpdateStatement();
break;
case Lexer::T_DELETE:
$statement = $this->DeleteStatement();
break;
default:
$this->syntaxError('SELECT, UPDATE or DELETE');
break;
}
]]>
match is an expression, so it can return a value unlike switch
Union Types
Using soft doc-comment union types in previous versions
Union Types
Careful switching to runtime fatals for types
weakMap
Map objects to arbitrary values without preventing GC
context = stream_context_create($opts);
$this->dfunc = $dfunc ? $dfunc : fn($x)=>$x;
}
}
class Api {
static public ?weakMap $cache = null;
static public function fetch(Endpoint $ep): string|object {
if(!self::$cache) self::$cache = new weakMap;
return self::$cache[$ep] ??=
$ep->dfunc->call($ep, file_get_contents($ep->url, context:$ep->context));
}
}
$xkcd = new Endpoint("http://xkcd.com/info.0.json", fn($x)=>json_decode($x, associative:false));
$joke = new Endpoint("https://icanhazdadjoke.com/", opts:['http'=>['header'=>"Accept:text/plain"]]);
echo '->img.')
'."\n";
echo Api::fetch($joke) . "\n";
echo Api::$cache->count() . "\n"; // 2
unset($xkcd);
echo Api::$cache->count() . "\n"; // 1
echo Api::fetch($joke) . "\n"; // Same bad joke
$joke = new Endpoint("https://icanhazdadjoke.com/", opts:['http'=>['header'=>"Accept:text/plain"]]);
echo Api::fetch($joke) . "\n"; // New bad joke
echo Api::$cache->count() . "\n"; // 2?
gc_collect_cycles(); // Force gc
echo Api::$cache->count() . "\n"; // 1
]]>
Run example at http://pres2.localhost/weakmap.php
Attributes
"The email '{{ value }}' is not a valid email."))]
private $email;
#[Assert\Range(["min" => 120, "max" => 180, "minMessage" => "You must be at least {{ limit }}cm tall to enter"])]
#[ORM\Column(ORM\Column::T_INTEGER)]
protected $height;
#[ORM\ManyToMany(Phonenumber::class)]
#[
ORM\JoinTable("users_phonenumbers"),
ORM\JoinColumn("user_id", "id"),
ORM\InverseJoinColumn("phonenumber_id", "id", ORM\JoinColumn::UNIQUE)
]
private $phonenumbers;
}
]]>
One per line, or comma-separated on same attribute line