Online PHP editor | output for 4TN3d

@ 2016-06-17T15:32:06Z

<?php

abstract class Singleton
{
    /**
     * @var Singleton[] The reference to *Singleton* instances of any child class.
     */
    private static $instances = array();
    
    /**
     * Returns the *Singleton* instance of this class.
     *
     * @return static The *Singleton* instance.
     */
    public static function getInstance()
    {
        if (!isset(self::$instances[static::class])) {
            self::$instances[static::class] = new static();
        }

        return self::$instances[static::class];
    }

    /**
     * Protected constructor to prevent creating a new instance of the
     * *Singleton* via the `new` operator from outside of this class.
     */
    protected function __construct()
    {
    }

    /**
     * Private clone method to prevent cloning of the instance of the
     * *Singleton* instance.
     *
     * @return void
     */
    private function __clone()
    {
    }

    /**
     * Private unserialize method to prevent unserializing of the *Singleton*
     * instance.
     *
     * @return void
     */
    private function __wakeup()
    {
    }
}

class SingletonChild extends Singleton
{
}

class AnotherChild extends Singleton
{
}

echo 'Expect: true, true, true, false' . PHP_EOL;

var_dump(SingletonChild::getInstance() === SingletonChild::getInstance());
var_dump(AnotherChild::getInstance() === AnotherChild::getInstance());

$a = AnotherChild::getInstance();
var_dump($a === AnotherChild::getInstance());
var_dump($a === SingletonChild::getInstance());

Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.28, 8.4.1 - 8.4.14, 8.5.0 - 8.5.1: Warning: The magic method Singleton::__wakeup() must have public visibility in /in/4TN3d on line 48 Expect: true, true, true, false bool(true) bool(true) bool(true) bool(false)
Output for 8.4.15: /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33: Expect: true, true, true, false bool(true) bool(true) bool(true) bool(false)
Output for 5.4.0 - 5.4.45: Parse error: syntax error, unexpected 'class' (T_CLASS), expecting identifier (T_STRING) or variable (T_VARIABLE) or '{' or '$' in /in/4TN3d on line 17
Process exited with code 255.
Output for 5.3.0 - 5.3.29: Parse error: syntax error, unexpected T_CLASS, expecting T_STRING or T_VARIABLE or '$' in /in/4TN3d on line 17
Process exited with code 255.
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17: Parse error: syntax error, unexpected T_STATIC, expecting ']' in /in/4TN3d on line 17
Process exited with code 255.
Output for 5.0.0 - 5.0.5: Parse error: parse error, unexpected T_STATIC, expecting ']' in /in/4TN3d on line 17
Process exited with code 255.
Output for 4.4.2 - 4.4.9: Parse error: syntax error, unexpected T_CLASS in /in/4TN3d on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1: Parse error: parse error, unexpected T_CLASS in /in/4TN3d on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error in /in/4TN3d on line 3
Process exited with code 255.

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