examples.md

Examples

class, interface, trait, method, function

Interfaces and traits follow the same rules as classes. Functions follow the same rules as methods.

namespace Vendor\Package;

use FooInterface;
use BarClass as Bar;
use OtherVendor\OtherPackage\BazClass;

class Foo extends Bar implements FooInterface {

    const X = 0;
    private $any;
	
    function __constructor() {
        $this->any = self::X;
    }

    public function sampleFunction( $a, $b = null ) {
        // method body
    }

    public static final function bar( Foo &$obj ) {
        return $obj->sampleFunction( $a );
    }

}

closure

$closureWithArgs = function ( $arg1, $arg2 ) {
    // body
};

$closureWithArgsAndVars = function ( $arg1, $arg2 ) use ( $var1, $var2 ) {
    // body
};

if, else, else if

if ( $a > $b ) {
    // body
} else if ( $b > $c && $a < SOME_CONSTANT ) {
    // body
} else {
    // body
}

switch

switch ( $value ) {
    case 10: {
        $x = 100;
        break;
    }
    case 20: ; // no break
    case 30: ; // no break
    case 40: {
        $x = 200;
        // no break
    }
    case 50: {
        return ++$x;
    }
    default: {
        $x = 0;
    }
}

while, do while

$i = 0;
while ( $i < 100 ) {
    ++$i;
}

$i = 0;
do {
    ++$i;
} while ( $i < 100 );

for, foreach

for ( $i = 0; $i < 100; ++$i ) {
    // body
}

$ages = array( 'Bob' => 20, 'Suzan' = 19, 'Paul' = 35 );
foreach ( $ages as $name => $age ) {
    echo $name, ' is ', $age, ' years old.';
}

try, catch, finally

$pdo = null;
$result = 'connected!';
try {
    $pdo = new PDO('mysql:host=127.0.0.1;dbname=test', 'root', '' );
} catch ( \PDOException $pe ) {
    $result = 'Database connection error: ' . $e->getMessage();
} finally {
    logMe( $result );
}

operators

$min = $value < 0 ? 0 : $value;
if ( $max < $min || $max === ( $min / 2 ) ) {
    // ...
}