Basic PHP Class Example

gistfile1.php

<?php

// Only allow this script to be run via the command line
if ( strtoupper(PHP_SAPI) !== 'CLI' ) {
    header( 'Content-type: text/plain' );
    echo 'This script can only be run via the command line.',
        PHP_EOL, 'Usage: php -f ',
        array_pop(explode('/', $_SERVER['SCRIPT_NAME']));
    exit( 1 );
}

interface IMamal {
    public function eat( $food );
    public function sleep( $hours );
}

abstract class Human implements IMamal {
    
    public $name, $age,
        $eyeColor, $hairColor;
    
    public $energy = 0;
    
    abstract function eat( $food );
    
    abstract function sleep( $hours );
    
}

class Person extends Human {
    
    private $foodEmotions = array(
        'delicious', 'tasty', 'scrumptious',
        'savory', 'sweet', 'yummy', 'mouthwatering'
    );
    
    private $sleepBad = array( 'meager', 'paltry', 'pathetic' );
    private $sleepGood = array( 'healthy', 'somberous', 'wonderful', 'rejuvenating' );
    
    function __construct( $name, $age, $eyeColor, $hairColor ) {
        $this->name = $name;
        $this->age = $age;
        $this->eyeColor = $eyeColor;
        $this->hairColor = $hairColor;
    }
    
    public function eat( $food ) {
        
        if ( $this->energy >= 100 ) {
            echo 'Energy is already full. I can\'t eat anymore!';
            return;
        }
        
        $this->energy += rand( 10, 30 );
        
        echo PHP_EOL, sprintf( '%s just ate some %s %s! He is now %s%% rested.', $this->name,
            $this->foodEmotions[rand(0, (count($this->foodEmotions) - 1))], $food, $this->energy
        );
        
    }
    
    public function sleep( $hours = 1 ) {
        
        if ( $this->energy >= 100 ) {
            echo 'Too much sleep is bad, get back to work!';
            return;
        }
        
        $this->energy += $hours;
        
        if ( $hours <= 4 ) {
            $sleepType = $this->sleepBad[rand(0, (count($this->sleepBad) - 1))];
        }
        else {
            $sleepType = $this->sleepGood[rand(0, (count($this->sleepGood) - 1))];
        }
        
        echo PHP_EOL, sprintf( '%s slept a %s %s hours, and is now %s%% rested.',
            $this->name, $sleepType, $hours, $this->energy
        );
        
    }
    
    public function work( $hours ) {
        
        if ( $this->energy <= 0 ) {
            echo PHP_EOL, $this->name, ' is overworked and needs sleep!';
            return;
        }
        
        $this->energy -= $hours;
        
        echo PHP_EOL, $this->name, ' worked ', $hours, ' hours.';
        
    }
    
    public function isAsleep() {
        return ( $this->energy <= 10 );
    }
    
    public function info() {
        return sprintf(
            '%s is a %s year old %s, and has %s eyes and %s hair.',
            $this->name, $this->age, get_class($this), $this->eyeColor, $this->hairColor
        );
    }
    
}

$me = new Person( 'Wes', 28, 'brown', 'brown' );

echo PHP_EOL, $me->info(), PHP_EOL;

$me->eat( 'pizza' );
$me->sleep( rand(1, 10) );
$me->eat( 'lasagna' );
$me->eat( 'falafel' );

for ( $i = 0; $i < 9; $i++ ) {
    $me->work( rand(8, 12) );
}

echo PHP_EOL, $me->name, (
    $me->isAsleep() ? ' is now sleeping!' : ' is wide awake.'
);

echo PHP_EOL;

?>