Nguyễn Khánk's Wiki

# New Syntax in PHP7

# Spaceship Operator

//integer comparison
echo 1 <=> 1;      // 0
echo 1 <=> 2;      // -1

//float comparison
echo 1.5 <=> 1.5;  // 0
echo 0.5 <=> 1.5;  // 0

//string comparison
echo "a" <=> "a";  // 0
echo "a" <=> "b";  // -1

# Null Coalescing Operator

// fetch the value of $_GET['user'] and returns 'not passed'
// if username is not passed
$username = $_GET['username'] ?? 'not passed';

// Chaining ?? operation
$username = $_GET['username'] ?? $_POST['username'] ?? 'not passed';

# Contant Arrays

define('animals', [
    'dog',
    'cat',
    'bird'
]);

# Closure::call()

Pre PHP7

class A {
    private $x = 1;
}

// Define a closure Pre PHP 7 code
$getValue = function() {
    return $this->x;
};

// Bind a clousure
$value = $getValue->bindTo(new A, 'A'); 

print($value());

PHP 7+

class A {
    private $x = 1;
}

// PHP 7+ code, Define
$value = function() {
    return $this->x;
};

print($value->call(new A));

# use Statement

// Before PHP 7
use com\tutorialspoint\ClassA;
use com\tutorialspoint\ClassB;
use com\tutorialspoint\ClassC as C;

// PHP 7+ code
use com\tutorialspoint\{ClassA, ClassB, ClassC as C};

# Scalar Type Declarations & Return Type Declarations

# Coercive mode

// Coercive mode
function sum(int ...$ints) : int {
    return array_sum($ints);
}
print(sum(2, '3', 4.1)); // 9

# Strict Mode

 // Strict mode
declare(strict_types=1);
function sum(int ...$ints) : int {
    return array_sum($ints);
}
print(sum(2, '3', 4.1));

Fatal error: Uncaught TypeError: Argument 2 passed to sum() must be of the type integer, string given, ...

# New methods

TIP

random_bytes() generates an arbitrary-length string of cryptographic random bytes that are suitable for cryptographic use, such as when generating salts, keys or initialization vectors.

// string random_bytes ( int $length )
$bytes = random_bytes(5);
bin2hex($bytes); // 54cc305593

TIP

random_int() generates cryptographic random integers that are suitable for use where unbiased results are critical.

// int random_int ( int $min , int $max )
random_int(-1000, 0) ; // -882

TIP

intdiv(), which performs integer division of its operands and return the division as int.

intdiv(10,3);  // 3

← OOP →