{"id":629,"date":"2015-09-14T08:00:30","date_gmt":"2015-09-14T11:00:30","guid":{"rendered":"https:\/\/felipeelia.com.br\/?p=629"},"modified":"2019-07-04T19:57:11","modified_gmt":"2019-07-04T22:57:11","slug":"hooks-no-wordpress-actions-e-filters","status":"publish","type":"post","link":"https:\/\/felipeelia.com.br\/hooks-no-wordpress-actions-e-filters\/","title":{"rendered":"Hooks no WordPress: Actions e Filters"},"content":{"rendered":"\n<p>Este artigo \u00e9 uma explica\u00e7\u00e3o sobre o uso e divis\u00e3o de hooks no WordPress. O artigo <a href=\"https:\/\/felipeelia.com.br\/o-que-sao-hooks\/\">O que s\u00e3o Hooks?<\/a> e alguns outros listados <a href=\"https:\/\/felipeelia.com.br\/curso-de-wordpress\/\">nesta p\u00e1gina<\/a> podem ajudar a entender melhor.<\/p>\n\n\n\n<p>Eu tamb\u00e9m fiz uma s\u00e9rie inteira sobre esse assunto l\u00e1 no meu <a rel=\"noreferrer noopener\" href=\"https:\/\/www.youtube.com\/c\/FelipeEliaWP\" target=\"_blank\">canal do YouTube<\/a> com mais exemplos e mais profundidade. <strong>Se gostar, n\u00e3o esque\u00e7a de se inscrever!<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-embed-youtube wp-block-embed is-type-video is-provider-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<p class=\"responsive-video-wrap clr\"><iframe loading=\"lazy\" title=\"Hooks no WordPress: Actions e Filters - Parte 1\" width=\"1200\" height=\"675\" src=\"https:\/\/www.youtube.com\/embed\/JBF0yax3nUY?list=PLQOxYa_OXt8iu6Q37cAZbF3i1t0TkvFF3\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen><\/iframe><\/p>\n<\/div><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Recapitulando<\/h2>\n\n\n\n<p>Se voc\u00ea caiu de paraquedas neste artigo \u00e9 preciso s\u00f3 relembrar o que s\u00e3o hooks e sua import\u00e2ncia. <strong>Hooks s\u00e3o formas de alterar o comportamento de um programa sem alterar seu c\u00f3digo original<\/strong>, o que \u00e9 especialmente importante&nbsp;quando se usa ferramenta de terceiros.<\/p>\n\n\n\n<p>Podemos encarar os hooks como formas de estender uma funcionalidade, isto \u00e9, acrescentar algum comportamento a um plugin ou ao pr\u00f3prio core do WordPress para&nbsp;que eles se adequem \u00e0&nbsp;nossa necessidade.<\/p>\n\n\n\n<figure><iframe loading=\"lazy\" style=\"border: 1px solid #CCC; border-width: 1px; margin-bottom: 5px; max-width: 100%;\" src=\"\/\/www.slideshare.net\/slideshow\/embed_code\/key\/HW838njaXX61DX\" width=\"100%\" height=\"400\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\" allowfullscreen=\"allowfullscreen\"> <\/iframe><\/figure>\n\n\n\n<div style=\"margin-bottom: 5px;\"><strong> <a title=\"Hooks no WordPress\" href=\"\/\/www.slideshare.net\/felipe_elia\/hooks-no-wordpress\" target=\"_blank\" rel=\"noopener noreferrer\">Hooks no WordPress<\/a> <\/strong> de <strong><a href=\"https:\/\/www.slideshare.net\/felipe_elia\" target=\"_blank\" rel=\"noopener noreferrer\">Felipe Elia<\/a><\/strong><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Um exemplo pr\u00e1tico antes de continuar<\/h2>\n\n\n\n<p>Quase todos os temas tem na tag &lt;head&gt;&nbsp;uma chamada \u00e0 fun\u00e7\u00e3o wp_head(). Veja o c\u00f3digo da fun\u00e7\u00e3o:<\/p>\n\n\n\n<pre class=\"wp-block-code php\"><code>function wp_head() {\n\t\/**\n\t * Print scripts or data in the head tag on the front end.\n\t *\n\t * @since 1.5.0\n\t *\/\n\tdo_action( 'wp_head' );\n}<\/code><\/pre>\n\n\n\n<p>A fun\u00e7\u00e3o \u00e9 meramente um hook, onde \u00e9 poss\u00edvel &#8220;pendurar&#8221; qualquer coisa que se queira. <strong>O pr\u00f3prio WordPress faz uso do hook<\/strong>, como \u00e9 poss\u00edvel ver no arquivo <code>wp-includes\/default-filters.php<\/code>, l\u00e1 pela linha 200. O que mais importa neste&nbsp;momento \u00e9 que voc\u00ea tamb\u00e9m pode fazer uso disto de um modo muito simples. No <code>functions.php<\/code> do seu tema voc\u00ea pode incluir:<\/p>\n\n\n\n<pre class=\"wp-block-code php\"><code>function exemplo_de_hook () {\n\techo '&lt;!-- S\u00f3 um coment\u00e1rio HTML -->';\n}\nadd_action('wp_head', 'exemplo_de_hook');<\/code><\/pre>\n\n\n\n<p>Assim o coment\u00e1rio&nbsp;ser\u00e1 impresso no cabe\u00e7alho do seu WordPress, <strong>sem que voc\u00ea tenha editado diretamente o c\u00f3digo da fun\u00e7\u00e3o<\/strong> wp_head().<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Divis\u00e3o entre actions e filters<\/h2>\n\n\n\n<p>Os hooks no WordPress s\u00e3o classificados entre <strong>A\u00e7\u00f5es (actions) e Filtros (filters)<\/strong>. Em termos de execu\u00e7\u00e3o eles s\u00e3o praticamente a mesma coisa (add_action \u00e9 s\u00f3 uma chamada para add_filter), mas conceitualmente elas s\u00e3o um pouco diferentes.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">A\u00e7\u00f5es (actions)<\/h3>\n\n\n\n<p>As a\u00e7\u00f5es s\u00e3o chamadas atrav\u00e9s da fun\u00e7\u00e3o <code>do_action<\/code> e s\u00e3o <strong>utilizadas em pontos onde se prev\u00ea a execu\u00e7\u00e3o de alguma coisa<\/strong>, por exemplo, quando se salva um post (<a href=\"https:\/\/codex.wordpress.org\/Plugin_API\/Action_Reference\/save_post\" target=\"_blank\" rel=\"noopener noreferrer\">save_post<\/a>),&nbsp;se deleta um usu\u00e1rio (<a href=\"https:\/\/codex.wordpress.org\/Plugin_API\/Action_Reference\/delete_user\" target=\"_blank\" rel=\"noopener noreferrer\">delete_user<\/a>), um pouco antes de exibir o carrinho de compras do woocommerce (<a href=\"https:\/\/github.com\/woothemes\/woocommerce\/search?utf8=%E2%9C%93&amp;q=woocommerce_before_cart\" target=\"_blank\" rel=\"noopener noreferrer\">woocommerce_before_cart<\/a>) ou logo depois de criar uma tabela no tablepress (tablepress_event_added_table). Importante perceber como&nbsp;bons plugins deixam previstos eventos como estes e como <strong>plugins excelentes n\u00e3o s\u00f3 preveem como tamb\u00e9m fornecem documenta\u00e7\u00e3o<\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Filtros (filters)<\/h3>\n\n\n\n<p>Filtros s\u00e3o normalmente usados quando h\u00e1 a previs\u00e3o para a <strong>altera\u00e7\u00e3o de uma vari\u00e1vel<\/strong> e, por isso, normalmente espera-se um retorno de uma fun\u00e7\u00e3o adicionada com o <code>add_filter()<\/code>. Observe a fun\u00e7\u00e3o nativa <code>the_content()<\/code>, por exemplo, que imprime o conte\u00fado de um post:<\/p>\n\n\n\n<pre class=\"wp-block-code php\"><code>function the_content( $more_link_text = null, $strip_teaser = false) {\n    $content = get_the_content( $more_link_text, $strip_teaser );\n\n    \/**\n     * Filter the post content.\n     *\n     * @since 0.71\n     *\n     * @param string $content Content of the current post.\n     *\/\n    $content = apply_filters( 'the_content', $content );\n    $content = str_replace( ']]>', ']]>', $content );\n    echo $content;\n}<\/code><\/pre>\n\n\n\n<p>Simplificando, ela pega o conte\u00fado, aplica os filtros e imprime o resultado. No arquivo wp-includes\/default-filters.php temos:<\/p>\n\n\n\n<pre class=\"wp-block-code php\"><code>add_filter( 'the_content', 'wptexturize'        );\nadd_filter( 'the_content', 'convert_smilies'    );\nadd_filter( 'the_content', 'convert_chars'      );\nadd_filter( 'the_content', 'wpautop'            );\nadd_filter( 'the_content', 'shortcode_unautop'  );\nadd_filter( 'the_content', 'prepend_attachment' );<\/code><\/pre>\n\n\n\n<p>Ou seja, <strong>o pr\u00f3prio WordPress pendura alguns filtros no the_content<\/strong>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Pendurar e despendurar: add_filter e remove_filter<\/h2>\n\n\n\n<p>T\u00e3o importante quanto poder&nbsp;incluir&nbsp;fun\u00e7\u00f5es nos hooks \u00e9 a <strong>possibilidade de retir\u00e1-los conforme a nossa necessidade<\/strong>. Vamos supor, por exemplo, que n\u00e3o queiramos que o WordPress insira automaticamente par\u00e1grafos no nosso conte\u00fado. Basta que no nosso tema ou plugin escrevamos:<\/p>\n\n\n\n<pre class=\"wp-block-code php\"><code>remove_filter('the_content', 'wpautop');<\/code><\/pre>\n\n\n\n<p>Algumas vezes n\u00e3o podemos retirar o filtro para&nbsp;todas as ocasi\u00f5es, ent\u00e3o podemos <strong>retir\u00e1-lo, usar a fun\u00e7\u00e3o com o apply_filters e inclu\u00ed-lo novamente<\/strong>:<\/p>\n\n\n\n<pre class=\"wp-block-code php\"><code>remove_filter('the_content', 'wpautop');\nthe_content();\nadd_filter('the_content', 'wpautop');<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">A ordem \u00e9 importante<\/h2>\n\n\n\n<p>Como voc\u00ea j\u00e1 deve ter&nbsp;imaginado,&nbsp;<strong>a ordem em que as fun\u00e7\u00f5es s\u00e3o executadas pode ser&nbsp;importante<\/strong>. Por exemplo: se voc\u00ea precisa criar um c\u00f3digo para cada novo post e precisa que este c\u00f3digo seja enviado por e-mail, a fun\u00e7\u00e3o que cria o c\u00f3digo deve ser necessariamente chamada antes do envio. Para isso <strong>existe o par\u00e2metro (opcional) de prioridades<\/strong>&nbsp;tanto nas actions quanto nos filters. Com valor padr\u00e3o 10, as fun\u00e7\u00f5es s\u00e3o executadas da menor prioridade para a maior, ou seja, fun\u00e7\u00f5es adicionadas com prioridade 1 s\u00e3o executadas antes das adicionadas com prioridade 2. Este par\u00e2metro tamb\u00e9m pode ser necess\u00e1rio para&nbsp;retirar fun\u00e7\u00f5es dos hooks.<\/p>\n\n\n\n<p>Necess\u00e1rio pensar tamb\u00e9m que os cen\u00e1rios de uso s\u00e3o extremamente variados e, por isso, o n\u00famero de par\u00e2metros esperados pelas fun\u00e7\u00f5es tamb\u00e9m varia. Para isso tamb\u00e9m existe um par\u00e2metro opcional.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Resumindo<\/h2>\n\n\n\n<p>O diagrama que eu criei no post sobre <a href=\"https:\/\/felipeelia.com.br\/como-remover-protegido-e-privado-dos-titulos-no-wordpress\/\">como remover \u201cProtegido\u201d e \u201cPrivado\u201d dos t\u00edtulos no WordPress<\/a>&nbsp;pode ajudar a entender de uma forma mais gr\u00e1fica como um filtro \u00e9 usado.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">A\u00e7\u00f5es<\/h3>\n\n\n\n<pre class=\"wp-block-code php\"><code>add_action( $hook, $function_to_add, $priority, $accepted_args ); \/\/ Adiciona uma a\u00e7\u00e3o\nremove_action( $tag, $function_to_remove, $priority ); \/\/ Retira uma a\u00e7\u00e3o\ndo_action( $tag, $arg ); \/\/ Executa todas as fun\u00e7\u00f5es adicionadas com o add_action()\n<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Filtros<\/h3>\n\n\n\n<pre class=\"wp-block-code php\"><code>add_filter( $tag, $function_to_add, $priority, $accepted_args ); \/\/ Adiciona um filtro\nremove_filter( $tag, $function_to_remove, $priority ); \/\/ Retira um filtro\napply_filters( $tag, $value, $var ... ); \/\/ Aplica os filtros, mas n\u00e3o \u00e9 uso comum.\n\n\/\/ Filtro com echo:\necho apply_filters( $tag, $value );\n\n\/\/ Filtro para uma vari\u00e1vel:\n$var = apply_filters( $tag, $value );<\/code><\/pre>\n\n\n\n<p>Gostou? N\u00e3o se esque\u00e7a de comentar e deixar sua contribui\u00e7\u00e3o. Agora que voc\u00ea sabe mais sobre os hooks, que tal olhar suas aplica\u00e7\u00f5es nos <a href=\"https:\/\/felipeelia.com.br\/wordpress-tudo-sobre-widgets\/\">widgets do WordPress<\/a>?<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Uma explica\u00e7\u00e3o sobre o uso e divis\u00e3o de hooks no Wordpress, um assunto fundamental para quem deseja programar no WP.<\/p>\n","protected":false},"author":1,"featured_media":630,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","footnotes":""},"categories":[30],"tags":[46],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.9.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Hooks no WordPress: Actions e Filters | Felipe Elia<\/title>\n<meta name=\"description\" content=\"Entenda como funcionam os hooks no WordPress, sua divis\u00e3o entre action e filter e porque a ordem de execu\u00e7\u00e3o \u00e9 importante. 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