OOP plugins

adding-provider.php

function __construct( $config ) {
	$this->providers = $config['providers'];
	$this->provider = $config['provider'];
  // Actions and filters here
}

age.php

add_filter( 'msf/form_fields', 'age_field_extension' );

function age_field_extension( $fields ) {
	$fields[] = '<input type="text" placeholder="Age" name="age">';
	return $fields;
}

constructor.php

function __construct( $config ) {
	$this->api_key = $config['api_key'];

	add_filter( 'the_content', array( $this, 'form' ) );
	add_action( 'wp_enqueue_scripts', array( $this, 'assets' ) );
	add_action( 'wp_ajax_msf_form_submit', array( $this, 'submissionHandler' ) );
	add_action( 'wp_ajax_nopriv_msf_form_submit', array( $this, 'submissionHandler' ) );
}

filter.php

function form( $content ) {
	if( ! is_singular() ) {
		return $content;
	}

	wp_enqueue_style( 'msf-style' );

	$nonce_field = wp_nonce_field( 'msf_form_submit', 'msf_nonce', true, false );

	if( !empty( $_GET['msf_success'] ) ) {
		$msf_display = '<div class="msf-success">Thanks for subscribing</div>';
	}
	else {

		$defaults = array(
			'email' => '<input type="email" placeholder="Email" required="required" name="email">'
		);

		$msf_fields = apply_filters( 'msf/form_fields', $defaults );

		$msf_display = '
			<h4>Get Free Awesome!</h4>
		    <form method="post" class="msf-form" action="' . admin_url( 'admin-ajax.php' ) . '">
				' . implode( "", $msf_fields  ) . '
		        <input type="submit" value="Subscribe Now">
				<input type="text" name="name">
				<input type="hidden" name="action" value="msf_form_submit">
		        ' . $nonce_field . '
		    </form>
		';
	}


	return $content . $msf_display;
}

final-config.php

$config = array(  
  'provider' => 'mailchimp',
  'providers' => array(
    'mailchimp' => array(
      'api_key' => 'cd64539dd19283cdcc637f2ccddcd45-us6'
    ),
    'madmimi' => array(
      'api_key' => 'JBJiwneJKNJBEhbfwbj2983hu43e'
    )
  )
);

full-oop.php

<?php
/*
Plugin Name: My Subscription Form
Plugin URI: http://danielpataki.com
Description: An OOP based project for WPMU DEV
Author: Daniel Pataki
Author URI: http://danielpataki.com
Version: 1.0.0
*/

$config = array(
	'api_key' => 'cd64539dd19283cdcc637f2ccddcd45-us6'
);

class MySubscriptionForm {
	var $api_key;

	function __construct( $config ) {
		$this->api_key = $config['api_key'];
		add_filter( 'the_content', array( $this, 'form' ) );
		add_action( 'wp_enqueue_scripts', array( $this, 'assets' ) );
		add_action( 'wp_ajax_msf_form_submit', array( $this, 'submissionHandler' ) );
		add_action( 'wp_ajax_nopriv_msf_form_submit', array( $this, 'submissionHandler' ) );
	}


	function form( $content ) {
		if( ! is_singular() ) {
			return $content;
		}

		wp_enqueue_style( 'msf-style' );

		$nonce_field = wp_nonce_field( 'msf_form_submit', 'msf_nonce', true, false );

		if( !empty( $_GET['msf_success'] ) ) {
			$msf_display = '<div class="msf-success">Thanks for subscribing</div>';
		}
		else {
			$msf_display = '
				<h4>Get Free Awesome!</h4>
			    <form method="post" class="msf-form" action="' . admin_url( 'admin-ajax.php' ) . '">
			        <input type="email" required="required" name="email">
			        <input type="submit" value="Subscribe Now">
					<input type="text" name="name">
					<input type="hidden" name="action" value="msf_form_submit">
			        ' . $nonce_field . '
			    </form>
			';
		}


		return $content . $msf_display;
	}

	function assets() {
		wp_register_style( 'msf-style', plugin_dir_url( __FILE__ ) . 'msf-styles.css' );
	}

	function submissionHandler() {
		if ( !empty( $_POST['name'] ) || !isset( $_POST['msf_nonce'] ) || ! wp_verify_nonce( $_POST['msf_nonce'], 'msf_form_submit' )
	) {
		die();
		return;
	}

	    wp_remote_post('https://us6.api.mailchimp.com/3.0/lists/bbcd6546db/members', array(
	        'headers' => array(
	            'Authorization' => 'Basic ' . base64_encode( 'mywebsite' . ':' . $this->api_key ),
	            'Content-Type' => 'application/json'
	        ),
	        'body' => json_encode( array(
	            'email_address' => $_POST['email'],
	            'status' => 'subscribed'
	        ))

	    ));

		$url = add_query_arg( 'msf_success', 'true', $_SERVER['HTTP_REFERER'] );
		wp_redirect( $url );

		die();

	}


}

new MySubscriptionForm( $config );

full-procedural.php

<?php
/*
Plugin Name: My Subscription Form
Plugin URI: http://danielpataki.com
Description: An OOP based project for WPMU DEV
Author: Daniel Pataki
Author URI: http://danielpataki.com
Version: 1.0.0
*/

add_filter( 'the_content', 'msf_post_form' );
function msf_post_form( $content ) {
	if( ! is_singular() ) {
		return $content;
	}

	wp_enqueue_style( 'msf-style' );

	$nonce_field = wp_nonce_field( 'msf_form_submit', 'msf_nonce', true, false );

	if( !empty( $_GET['msf_success'] ) ) {
		$msf_display = '<div class="msf-success">Thanks for subscribing</div>';
	}
	else {
		$msf_display = '
			<h4>Get Free Awesome!</h4>
		    <form method="post" class="msf-form" action="' . admin_url( 'admin-ajax.php' ) . '">
		        <input type="email" required="required" name="email">
		        <input type="submit" value="Subscribe Now">
				<input type="text" name="name">
				<input type="hidden" name="action" value="msf_form_submit">
		        ' . $nonce_field . '
		    </form>
		';
	}


	return $content . $msf_display;
}


add_action( 'wp_enqueue_scripts', 'msf_assets' );
function msf_assets() {
	wp_register_style( 'msf-style', plugin_dir_url( __FILE__ ) . 'msf-styles.css' );
}

add_action( 'wp_ajax_msf_form_submit', 'msf_form_submit' );
add_action( 'wp_ajax_nopriv_msf_form_submit', 'msf_form_submit' );

function msf_form_submit() {
	if ( !empty( $_POST['name'] ) || !isset( $_POST['msf_nonce'] ) || ! wp_verify_nonce( $_POST['msf_nonce'], 'msf_form_submit' )
) {
	die();
	return;
}

    wp_remote_post('https://us6.api.mailchimp.com/3.0/lists/bbcd6546db/members', array(
        'headers' => array(
            'Authorization' => 'Basic ' . base64_encode( 'mywebsite' . ':' . 'cd64539dd19283cdcc637f2ccddcd45-us6' ),
            'Content-Type' => 'application/json'
        ),
        'body' => json_encode( array(
            'email_address' => $_POST['email'],
            'status' => 'subscribed'
        ))

    ));

	$url = add_query_arg( 'msf_success', 'true', $_SERVER['HTTP_REFERER'] );
	wp_redirect( $url );

	die();

}

full.php

<?php
/*
Plugin Name: My Subscription Form
Plugin URI: http://danielpataki.com
Description: An OOP based project for WPMU DEV
Author: Daniel Pataki
Author URI: http://danielpataki.com
Version: 1.1.0
*/

$config = array(
    'provider' => 'mailchimp',
    'providers' => array(
        'mailchimp' => array(
            'api_key' => 'bdbdbdb4b4b4b4bdbdb4b4b-us6'
        ),
        'madmimi' => array(
            'api_key' => 'wiefsbjkHJBwhlabHJbflh34bwf'
        )
    )
);

class MySubscriptionForm {
	var $providers;
	var $provider;

	function __construct( $config ) {
		$this->providers = $config['providers'];
		$this->provider = $config['provider'];
		add_filter( 'the_content', array( $this, 'form' ) );
		add_action( 'wp_enqueue_scripts', array( $this, 'assets' ) );
		add_action( 'wp_ajax_msf_form_submit', array( $this, 'submissionHandler' ) );
		add_action( 'wp_ajax_nopriv_msf_form_submit', array( $this, 'submissionHandler' ) );
	}


	function form( $content ) {
		if( ! is_singular() ) {
			return $content;
		}

		wp_enqueue_style( 'msf-style' );

		$nonce_field = wp_nonce_field( 'msf_form_submit', 'msf_nonce', true, false );

		if( !empty( $_GET['msf_success'] ) ) {
			$msf_display = '<div class="msf-success">Thanks for subscribing</div>';
		}
		else {

			$defaults = array(
				'email' => '<input type="email" placeholder="Email" required="required" name="email">'
			);

			$msf_fields = apply_filters( 'msf/form_fields', $defaults );

			$msf_display = '
				<h4>Get Free Awesome!</h4>
			    <form method="post" class="msf-form" action="' . admin_url( 'admin-ajax.php' ) . '">
					' . implode( "", $msf_fields  ) . '
			        <input type="submit" value="Subscribe Now">
					<input type="text" name="name">
					<input type="hidden" name="action" value="msf_form_submit">
			        ' . $nonce_field . '
			    </form>
			';
		}


		return $content . $msf_display;
	}

	function assets() {
		wp_register_style( 'msf-style', plugin_dir_url( __FILE__ ) . 'msf-styles.css' );
	}

	function mailchimpHandler() {
		if ( !empty( $_POST['name'] ) || !isset( $_POST['msf_nonce'] ) || ! wp_verify_nonce( $_POST['msf_nonce'], 'msf_form_submit' )
	) {
		die();
		return;
	}

	    wp_remote_post('https://us6.api.mailchimp.com/3.0/lists/bdbbdbdbd/members', array(
	        'headers' => array(
	            'Authorization' => 'Basic ' . base64_encode( 'mywebsite' . ':' . $this->providers['mailchimp']['api_key'] ),
	            'Content-Type' => 'application/json'
	        ),
	        'body' => json_encode( array(
	            'email_address' => $_POST['email'],
	            'status' => 'subscribed'
	        ))
		
	    ));

		$url = add_query_arg( 'msf_success', 'true', $_SERVER['HTTP_REFERER'] );
		wp_redirect( $url );

		die();

	}


	function submissionHandler() {
		if( method_exists($this, $this->provider . 'Handler' ) ) {
            call_user_func( array( $this, $this->provider . 'Handler' ) );
		}
        else {
            echo $this->provider . 'Handler does not exist' ;
        }
	}

}

new MySubscriptionForm( $config );

new-constructor.php

var $providers;

function __construct( $config ) {
	$this->providers = $config['providers'];
 	// rest of the constructor
}

new-handler.php

wp_remote_post('https://us6.api.mailchimp.com/3.0/lists/bbcd6546db/members', array(
    'headers' => array(
        'Authorization' => 'Basic ' . base64_encode( 'mywebsite' . ':' . $this->providers['mailchimp']['api_key'] ),
        'Content-Type' => 'application/json'
    ),
    'body' => json_encode( array(
        'email_address' => $_POST['email'],
        'status' => 'subscribed'
    ))

));

oop-skeleton.php

$config = array(
  'api_key' => 'cd64539dd19283cdcc637f2ccddcd45-us6'
);

class MySubscriptionForm {
  var $api_key;

  function __constructor( $config ) {
    $this->api_key = $config['api_key'];
  }

}

new MySubscriptionForm( $config );

provider-config.php

$config = array(
  'providers' => array(
    'mailchimp' => array(
      'api_key' => 'cd64539dd19283cdcc637f2ccddcd45-us6'
    ),
    'madmimi' => array(
      'api_key' => 'JBJiwneJKNJBEhbfwbj2983hu43e'
    )
  )
);

styles.css

.msf-form {
    display:flex;
}

.msf-success {
    background: #ABFFAC;
    color: #60C661;
    text-align: center;
    width:100%;
    padding:22px;
}

submissionHandler.php

function submissionHandler() {
	if( method_exists($this, $this->provider . 'Handler' ) ) {
        call_user_func( array( $this, $this->provider . 'Handler' ) );
	}
    else {
        echo $this->provider . 'Handler does not exist' ;
    }
}