Custom Placeholder
Each placeholder is defined with a class responsible for replacing a specific string tag with a dynamic value. Placeholder class needs to extend
EasyWatermark\Placeholders\Abstracts\Placeholder and should implement the following methods:- 1.
resolve- returning the value of the placeholder - 2.
validate- checking if the value is correct - 3.
sanitize- sanitizing the value
There are also 4 abstract placeholders available that implement the
validate and sanitize methods for a given value type:- 1.
EasyWatermark\Placeholders\Abstracts\EmailPlaceholder - 2.
EasyWatermark\Placeholders\Abstracts\IntegerPlaceholder - 3.
EasyWatermark\Placeholders\Abstracts\StringPlaceholder - 4.
EasyWatermark\Placeholders\Abstracts\UrlPlaceholder
use EasyWatermark\Placeholders\Abstracts\StringPlaceholder;
/**
* Abstract placeholder
*/
class FavoriteColorPlaceholder extends StringPlaceholder {
/**
* Constructor
*
* @return void
*/
public function __construct() {
$this->slug = 'favorite_color';
$this->name = __( 'Favorite color', 'textdomain' );
$this->example = __( 'blue', 'textdomain' );
}
/**
* Resolves placeholder
*
* @param EasyWatermark\Placeholders\Resolver $resolver Placeholders resolver instance.
* @return string
*/
public function resolve( $resolver ) {
$user = wp_get_current_user();
return get_user_meta( 'favorite_color', $user->ID );
}
}
The above class will replace a
%favorite_color% string in the watermark text with the value of a favorite_color meta for logged-in user./**
* @param EasyWatermark\Placeholders\Resolver $resolver Placeholders resolver instance.
*/
add_action( 'easy-watermark/placeholders/load', function ( $resolver ) {
// Add custom placeholder instance to the resolver.
$resolver->add_placeholder( new FavoriteColorPlaceholder() );
} );
Last modified 2yr ago