An awesome PHP cheatsheet.

<?php

// Exit the file, string inside get's echo'ed
die("This file is not ment to be ran. ¯\_(ツ)_/¯");
exit("This file is not ment to be ran. ¯\_(ツ)_/¯");

/**
 * Printing
 */
echo ""; // Print a string or type that can be made into a string(I.E int, float).
print_r($arr); // Print anything, with type hints for array's and object's
var_dump($arr); // Print anything, with type hints for any value and sizes

/**
 * Ways of looping
 */
continue; // Skip current iter
break;    // Exit loop

// Foreach
foreach($arr as $key => $value) {
    $key = $key;
    $value = $value;
}

// For
for($i = 0; $i < count($arr) - 1; $i++) {
    $key = $i;
    $value = $arr[$i];
}

// While
$i = 0;
while($i < count($arr) - 1) {
    $key = $i;
    $value = $arr[$i];
}

// Do while
$i = 0;
do {
    $key = $i;
    $value = $arr[$i];
} while($i < count($arr));

// Switch
switch($arr) {
    case 1:
        break;
    case 2:
        break;
    case 3:
        break;
    default:
}

/**
 * Global variables
 * http://php.net/manual/en/language.variables.superglobals.php
 */
$_SERVER; // SERVER variables
$_GET; // Query params
$_POST; // Post fields
$_REQUEST; // GET and POST together
$GLOBALS; // Array of global variables
$_SESSION; // Browser session
$_FILES; // Array of files that are sent in request
$_COOKIE; // Array of cookies sent in request
$_ENV; // php.ini options
$argv; // Array of terminal arguments (filename included)
$argc; // Number of arguments passed into terminal

/**
 * Class
 * http://php.net/manual/en/language.oop5.basic.php
 */
class NormalClass extends AbstractClassName implements InterfaceName
{

    use TraitName;

    // --> PROPERTY TYPES <--

    /**
     * Public property, everyone can access this property.
     * @var Type
     */
    public $property;

    /**
     * Private property, only this instance can access this property.
     * @var Type
     */
    private $property;

    /**
     * Protected property, this instance and childs can access this property.
     * @var Type
     */
    protected $property;

    /**
     * Static property, is the same for all instances of this class.
     * @var Type
     */
    static $property;

    // --> FUNCTION TYPES <--

    /**
     * Public function, everyone can access this function.
     * @param Type
     * @return Type
     */
    public function publicFunction(Type $var = null): Type
    {
    }

    /**
     * Private function, only this instance can access this function.
     * @param Type
     * @return Type
     */
    private function privateFunction(Type $var = null): Type
    {
    }

    /**
     * Protected function, this instance and childs can access this function.
     * @param Type
     * @return Type
     */
    protected function protectedFunction(Type $var = null): Type
    {
    }

    /**
     * Static function, doesn't need an instance to be executed.
     * @param Type
     * @return Type
     */
    public static function staticFunction(Type $var = null): Type
    {
    }

    // --> MAGIC METHODS <--

    /**
     * Gets triggered on creating a new class instance
     * http://php.net/manual/en/language.oop5.decon.php
     * @param Type
     * @return void
     */
    public function __construct(Type $var = null)
    {
    }

    /**
     * Gets triggered on destruction of a class instance
     * http://php.net/manual/en/language.oop5.decon.php
     * @return void
     */
    public function __destruct()
    {
    }

    /**
     * __set() is run when writing data to inaccessible properties.
     * http://php.net/manual/en/language.oop5.overloading.php
     * @param string name
     * @param mixed value
     * @return void
     */
    public function __set(string $name , mixed $value)
    {
    }

    /**
     * __get() is utilized for reading data from inaccessible properties.
     * http://php.net/manual/en/language.oop5.overloading.php
     * @param string name
     * @return mixed
     */
    public function __get(string $name)
    {
    }

    /**
     * __isset() is triggered by calling isset() or empty() on inaccessible properties.
     * http://php.net/manual/en/language.oop5.overloading.php
     * @param string name
     * @return bool
     */
    public function __isset(string $name)
    {
    }

    /**
     * __unset() is invoked when unset() is used on inaccessible properties.
     * http://php.net/manual/en/language.oop5.overloading.php
     * @param string name
     * @return void
     */
    public function __unset(string $name)
    {
    }

    /**
     * __call is triggered when invoking inaccessible methods in an object context.
     * http://php.net/manual/en/language.oop5.overloading.php
     * @param string name
     * @param array arguments
     * @return mixed
     */
    public function __call(string $name, array $arguments)
    {
    }

    /**
     * __callStatic() is triggered when invoking inaccessible methods in a static context.
     * http://php.net/manual/en/language.oop5.overloading.php
     * @param string name
     * @param array arguments
     * @return mixed
     */
    public static function __callStatic(string $name, array $arguments)
    {
    }

    /**
     * http://php.net/manual/en/language.oop5.magic.php
     * @return array
     */
    public function __sleep()
    {
    }

    /**
     * http://php.net/manual/en/language.oop5.magic.php
     * @return void
     */
    public function __wakeup()
    {
    }

    /**
     * http://php.net/manual/en/language.oop5.magic.php
     * @return string
     */
    public function __toString()
    {
    }

    /**
     * http://php.net/manual/en/language.oop5.magic.php
     * @param Type
     * @return mixed
     */
    public function __invoke(Type $var = null)
    {
    }

    /**
     * http://php.net/manual/en/language.oop5.magic.php
     * @param array properties
     * @return object
     */
    public static function __set_state(array $properties)
    {
    }

    /**
     * http://php.net/manual/en/language.oop5.magic.php
     * @return array
     */
    public function __debugInfo()
    {
    }

}

/**
 * Every class that has implemented this interface need to have the same functions.
 */
interface InterfaceName
{

    public function FunctionName(Type $var = null): Type;

}

/**
 * Combination of class and interface.
 */
abstract class AbstractClassName
{

    /**
     * Classes extending this abstract class need to have this function.
     * @param Type
     * @return Type
     */
    abstract function abstractFunction(Type $var = null): Type;

}