PHP 7
PHP 7: The Important Stuff
Basic PHP 7 cheat sheet from symfonycasts.
Throwable
Both \Exception and \Error implements \Throwable:
<?php
try {
undefinedFunction();
} catch (\Throwable $error) {
echo 'Now if you write bad code, you can catch it! ' . $error->getMessage();
}
echo "\n\nContinue processing file...";
Scalar Type Hints
string, int, float, bool, array, callable, iterable
public function setName(string $name)
Weak Mode (defaut mode) versus Strict Mode
declare(strict_types = 1);
Return Types
string, int, float, bool, array, callable, iterable
public function getName(): string
Nullable Types
public function getFunFact(): ?string
Void Types
public function setFunFact(?string $funFact): void
Private Constants
private const AVATAR_FILE_PREFIX = '/images';
The iterable Pseudo-Type
public function feed(iterable $food): string
The Multi Exception Catch
try {
if (random_int(0, 1)) {
throw new NoCookieForYou();
}
throw new NoCookiesLeft();
} catch (NoCookieForYou | NoCookiesLeft $e) {
$whisper = sprintf('Crazy Dave whispered "%s"', $e->getMessage());
}
spaceship operator <=>
It returns -1, 0 or 1 when first expression is respectively less than, equal to, or greater than second expression.
print( 1 <=> 1);print("<br/>");
print( 1 <=> 2);print("<br/>");
print( 2 <=> 1);print("<br/>");
Null Coalescing Operator ??
$username = $_GET['username'] ?? 'not passed';
Equivalent code using ternary operator:
$username = isset($_GET['username']) ? $_GET['username'] : 'not passed';