New in php 7

Conference Confirmed
http://truenorthphp.ca
November 5, 6, 7
@TrueNorthPHP
Talk to Pete or Vic
about sponsorship
opportunities. Call for
speakers and tickets
coming soon.
http://gtaphp.org/ks

O’Reilly has offered our group 50% off all e-Books,
other items also discounted. Discount code: PCBW

• Ask questions at any time
• Point out mistakes at any time
• Slides will be posted online so there is no need to
photograph slides

Roadmap
• New Features
• Backwards Compatibility Breaks
• Bug Fixes
• Wrap-up
• “Get the most” tips as we go

6.0?
5.7?
Used with permission from https://www.flickr.com/photos/jeepersmedia/8030074932/.
"PHP 7" on hat is a modification from the original image.

Faster than PHP 7
Based on phpng
Many additional optimizations
Still getting considerably faster
Should rival hack for performance

Return types
function foo(): array {
return [];
}
function foo(): DateTime {
return null; // invalid
}

Return types
Class constructors, destructors and clone
methods may not declare return types.
No void return type

Scalar Type Declarations
int, float, string and bool
“an atomic quantity that can hold
only one value at a time”
- Wikipedia
integer or boolean
declare(strict_types=1)

function add(int $a, int $b) {
return $a + $b;
}
echo add(1, 2); // 3
echo add(1.1, 2); // 3

declare(strict_types=1);
function add(int $a, int $b) {
return $a + $b;
}
echo add(1, 2); // 3
echo add(1.1, 2); // Error
1.0 would also throw an error,
but coercing an int to a float is ok.

<=>
function order_func($a, $b) {
return $a <=> $b;
}
echo 1 <=> 1; // 0
echo 1 <=> 2; // -1
echo 2 <=> 1; // 1

Anonymous classes
class MyLogger {
public function log($msg) {
print_r($msg . "n");
}
}
$pusher->setLogger( new MyLogger() );
$pusher->setLogger(new class {
public function log($msg) {
print_r($msg . "n");
}
});
Old:
New:

Generator Return Values
function foo() {
yield 1;
yield 2;
return 42;
}
$bar = foo();
foreach ($bar as $element) {
echo $element, "n";
}
var_dump($bar->getReturn());
1
2
int(42)

Generator Delegationfunction myGeneratorFunction($foo) {
// ... do some stuff with $foo ...
$bar = yield from factoredComputation1($foo);
// ... do some stuff with $bar ...
$baz = yield from factoredComputation2($bar);
return $baz;
}
function factoredComputation1($foo) {
yield ...; // pseudo-code (something we factored out)
return 'zanzibar';
}
function factoredComputation2($bar) {
return 42;

Engine Exceptions
try {
$o = null;
$o->method();
} catch (EngineException $e) {
echo "Exception: {$e->getMessage()}n";
}
try {
eval("Hello GTA-PHP!");
} catch (ParseException $e) {
echo "Exception: {$e->getMessage()}n";
}

Engine Exceptions
BaseException (abstract)
EngineException
ParseException
Exception
ErrorException
RuntimeException
calls to a member function of a non-object now raise a non fatal E

Group Use Declarations
use FooLibraryBarBaz{ ClassA, ClassB, ClassC, ClassD as Fizbo };
use SymfonyComponentConsole{
HelperTable,
InputArrayInput,
InputInputInterface,
OutputNullOutput,
OutputOutputInterface,
QuestionQuestion,
QuestionChoiceQuestion as Choice,
QuestionConfirmationQuestion,
};

Uniform Variable Syntax
// support missing combinations of operations
$foo()['bar']()
[$obj1, $obj2][0]->prop
getStr(){0}
// support nested ::
$foo['bar']::$baz
$foo::$bar::$baz
$foo->bar()::baz()
// support nested ()
foo()()
$foo->bar()()
Foo::bar()()
$foo()()

// support operations on arbitrary (...) expressions
(...)['foo']
(...)->foo
(...)->foo()
(...)::$foo
(...)::foo()
(...)()
// two more practical examples for the last point
(function() { ... })()
($obj->closure)()
// support all operations on dereferencable scalars (not very
useful)
"string"->toLower()
[$obj, 'method']()
'Foo'::$bar
Uniform Variable Syntax

Unicode Escape Syntax
echo "We u{2665} PHPn";
We ♥ PHP

Coalesce ??
isset($_GET['user']) ? $_GET['user'] : 'nobody'
$_GET['user'] ?? 'nobody'
“COALESCE, an SQL command that selects
the first non-null from a range of values”
- Wikipedia
$x = ["yarr" => "meaningful_value"];
echo $x["aharr"] ?? $x["waharr"] ?? $x["yarr"];

Closure::call
class Foo {
private $x = 3;
}
$foo = new Foo;
$foobar = function () {
var_dump($this->x);
};
$foobar->call($foo); // prints int(3)

Filtered unserialize()
// Unserialize everything as before
$data = unserialize($foo);
// Convert all objects into __PHP_Incomplete_Class object
$data = unserialize($foo, ["allowed_classes" => false]);
//Convert all objects except MyClass / MyClass2 into __PHP_Incomplete_Class
$data = unserialize($foo, ["allowed_classes" => [
"MyClass",
“MyClass2",
]);
//accept all classes as in default
$data = unserialize($foo, ["allowed_classes" => true]);

Turn gc_collect_cycles into
function pointer

Remove the
date.timezone warning

Remove E_STRICT in favour
of E_DEPRECATED,
E_NOTICE, E_WARNING or
removal

Continue output
buffering despite
aborted connection

Better i18n/l10n with
IntlChar class

session_start() read_only and lazy_write options

Backwards
Compatibility Breaks

Reserved words: int, float, bool,
string, true, false, null
Reserved for future use: resource,
object, scalar, mixed, numeric

Constructor behaviour of internal classes:
what returned null now throws an error

"Remove" PHP 4 constructors
with E_DEPRECATED

Much that was deprecated is
now GONE - the big one is mysql

Extension API: Big changes, possible “PNI”

Custom session handlers will
return true or false, not
0 (SUCCESS) or 1
(FAILURE)

Remove alternative PHP tags
<% opening tag
<%= opening tag with echo
%> closing tag
(<scripts+languages*=s*(php|"php"|'php')s*>)i opening tag
(</script>)i closing tag
ot remove short opening tags (<?) or short opening tags with echo

Bottom line: Modern PHP should work fine

foreach
$a = [1,2,3];
foreach($a as $v) {
echo $v . " - " .
current($a) . "n";
}
1 - 2
2 - 2
3 - 2
$a = [1,2,3];
$b = $a;
foreach($a as $v) {
echo $v . " - " .
current($a) . "n";
}
1 - 1
2 - 1
3 - 1
PHP 7’s foreach doen’t change
an array’s internal pointer

Remove hex support in
numeric strings
$str = '0x123';
if (!is_numeric($str)) {
throw new Exception('Not a number');
}
$n = (int) $str;
// Exception not thrown, instead the
// wrong result is generated here:
// 0

Multiple Default Cases in a
Switch
switch ($expr) {
default:
doSomething();
break;
default:
somethingElse();
}
Previously called last default
PHP 7 raises
E_COMPILE_ERROR

Fix list() Inconsistency
list($a,$b) = "aa";
var_dump($a,$b);
$a[0]="ab";
list($a,$b) = $a[0];
var_dump($a,$b);
NULL
NULL
string(1) "a"
string(1) "b"
PHP 7’s list treats
strings like arrays

References
• PHP 7 at a glance:
http://devzone.zend.com/4693/php-7-glance/
• What to Expect When You’re Expecting PHP 7:
https://blog.engineyard.com/2015/what-to-expect-
php-7
• https://wiki.php.net/rfc#php_70
https://wiki.php.net/rfc#pending_implementation

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