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
Placeholder class
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use EasyWatermark\Placeholders\Abstracts\StringPlaceholder;
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/**
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* Abstract placeholder
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*/
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class FavoriteColorPlaceholder extends StringPlaceholder {
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/**
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* Constructor
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*
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* @return void
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*/
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public function __construct() {
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$this->slug = 'favorite_color';
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$this->name = __( 'Favorite color', 'textdomain' );
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$this->example = __( 'blue', 'textdomain' );
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}
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/**
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* Resolves placeholder
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*
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* @param EasyWatermark\Placeholders\Resolver $resolver Placeholders resolver instance.
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* @return string
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*/
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public function resolve( $resolver ) {
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$user = wp_get_current_user();
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return get_user_meta( 'favorite_color', $user->ID );
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}
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}
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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.Registering the Placeholder
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/**
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* @param EasyWatermark\Placeholders\Resolver $resolver Placeholders resolver instance.
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*/
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add_action( 'easy-watermark/placeholders/load', function ( $resolver ) {
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// Add custom placeholder instance to the resolver.
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$resolver->add_placeholder( new FavoriteColorPlaceholder() );
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} );
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Last modified 8mo ago
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