[WordPress] Sanitizing Arrays: The WordPress Settings API

1-sanitization-first-pass.php

<?php 
	
/**
 * A custom sanitization function that will take the incoming input, and sanitize
 * the input before handing it back to WordPress to save to the database.
 *
 * @since    1.0.0
 *
 * @param    array    $input        The address input.
 * @return   array    $new_input    The sanitized input.
 */
public function sanitize( $input ) {

	// Initialize the new array that will hold the sanitize values
	$new_input = array();

	// Loop through the input and sanitize each of the values
	foreach ( $input as $key => $val ) {

		switch ( $key ) {

			case 'address_1':

				$new_input[ $key ] = sanitize_text_field( $val );
				break;

			case 'address_2':

				$new_input[ $key ] = sanitize_text_field( $val );
				break;

			case 'city':

				$new_input[ $key ] = sanitize_text_field( $val );
				break;

			case 'province':

				$new_input[ $key ] = sanitize_text_field( $val );
				break;

			case 'postal_code':

				$new_input[ $key ] = sanitize_text_field( $val );
				break;

		}

	}

	return $new_input;

}

2-sanitization-second-pass.php

<?php 
	
/**
 * A custom sanitization function that will take the incoming input, and sanitize
 * the input before handing it back to WordPress to save to the database.
 *
 * @since    1.0.0
 *
 * @param    array    $input        The address input.
 * @return   array    $new_input    The sanitized input.
 */
public function sanitize( $input ) {

	// Initialize the new array that will hold the sanitize values
	$new_input = array();

	// Loop through the input and sanitize each of the values
	foreach ( $input as $key => $val ) {
		$new_input[ $key ] = sanitize_text_field( $val );
	}

	return $new_input;

}

3-sanitization-third-pass.php

<?php 
	
/**
 * A custom sanitization function that will take the incoming input, and sanitize
 * the input before handing it back to WordPress to save to the database.
 *
 * @since    1.0.0
 *
 * @param    array    $input        The address input.
 * @return   array    $new_input    The sanitized input.
 */
public function sanitize( $input ) {

	// Initialize the new array that will hold the sanitize values
	$new_input = array();

	// Loop through the input and sanitize each of the values
	foreach ( $input as $key => $val ) {
		
		$new_input[ $key ] = ( isset( $input[ $key ] ) ) ?
			sanitize_text_field( $val ) :
			'';

	}

	return $new_input;

}

4-sanitization-fourth-pass.php

<?php 
	
/**
 * A custom sanitization function that will take the incoming input, and sanitize
 * the input before handing it back to WordPress to save to the database.
 *
 * @since    1.0.0
 *
 * @param    array    $input        The address input.
 * @return   array    $new_input    The sanitized input.
 */
public function sanitize( $input ) {

	// Initialize the new array that will hold the sanitize values
	$new_input = array();

	// Loop through the input and sanitize each of the values
	foreach ( $input as $key => $val ) {
		$new_input[ $key ] = sanitize_text_field( $val );
	}

	return $new_input;

}