{"id":1020,"date":"2024-05-16T20:27:24","date_gmt":"2024-05-16T23:27:24","guid":{"rendered":"https:\/\/thiagorossi.com.br\/blog\/?p=1020"},"modified":"2025-12-02T12:49:43","modified_gmt":"2025-12-02T15:49:43","slug":"map-filter-reduce-php","status":"publish","type":"post","link":"https:\/\/thiagorossi.com.br\/blog\/map-filter-reduce-php\/","title":{"rendered":"Map Filter Reduce PHP"},"content":{"rendered":"<span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Tempo de leitura: <\/span> <span class=\"rt-time\"> 4<\/span> <span class=\"rt-label rt-postfix\">minutos<\/span><\/span>\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>Map Filter Reduce PHP<\/strong>: A <strong>Programa\u00e7\u00e3o Funcional<\/strong> oferece uma abordagem poderosa e declarativa para manipular dados, tratando a transforma\u00e7\u00e3o de dados como a aplica\u00e7\u00e3o de fun\u00e7\u00f5es. No <strong>PHP<\/strong>, as fun\u00e7\u00f5es nativas <strong><code>array_map<\/code><\/strong>, <strong><code>array_filter<\/code><\/strong> e <strong><code>array_reduce<\/code><\/strong> s\u00e3o as ferramentas prim\u00e1rias para aplicar esses conceitos, simplificando tarefas complexas em arrays.<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">O uso dessas fun\u00e7\u00f5es resulta em um c\u00f3digo mais <strong>leg\u00edvel<\/strong>, <strong>conciso<\/strong> e <strong>f\u00e1cil de testar<\/strong>.<\/p>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading has-large-font-size\">1. \ud83d\uddfa\ufe0f Fun\u00e7\u00e3o <code>array_map<\/code>: Transformando Elementos<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">A fun\u00e7\u00e3o <code>array_map<\/code> aplica uma fun\u00e7\u00e3o de <em>callback<\/em> a <strong>cada elemento<\/strong> de um array de entrada e <strong>retorna um novo array<\/strong> com os resultados transformados. O array original permanece inalterado.<\/p>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">Sintaxe<\/h3>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">PHP<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>array_map(callable $callback, array $array)\n<\/code><\/pre>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">Exemplo: Dobrando Valores<\/h3>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Ideal para transformar todos os elementos de um array seguindo uma regra espec\u00edfica (ex: convers\u00e3o de moeda, altera\u00e7\u00e3o de <em>strings<\/em>).<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">PHP<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;?php\n$numeros = &#91;1, 2, 3, 4, 5];\n\n$dobros = array_map(function($numero) {\n    \/\/ A fun\u00e7\u00e3o de callback deve retornar o valor transformado\n    return $numero * 2;\n}, $numeros);\n\nprint_r($dobros); \n\/\/ Sa\u00edda: Array ( &#91;0] =&gt; 2 &#91;1] =&gt; 4 &#91;2] =&gt; 6 &#91;3] =&gt; 8 &#91;4] =&gt; 10 )\n?&gt;\n<\/code><\/pre>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading has-large-font-size\">2. \ud83d\udee1\ufe0f Fun\u00e7\u00e3o <code>array_filter<\/code>: Selecionando Elementos<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">A fun\u00e7\u00e3o <code>array_filter<\/code> itera sobre um array e <strong>retorna um novo array<\/strong> contendo apenas os elementos que satisfazem uma determinada condi\u00e7\u00e3o.<\/p>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">Sintaxe<\/h3>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">PHP<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>array_filter(array $array, callable $callback)\n<\/code><\/pre>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">Exemplo: Filtrando N\u00fameros Pares<\/h3>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">A fun\u00e7\u00e3o de <em>callback<\/em> deve retornar <code>true<\/code> para manter o elemento, ou <code>false<\/code> para descart\u00e1-lo.<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">PHP<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;?php\n$numeros = &#91;1, 2, 3, 4, 5];\n\n$pares = array_filter($numeros, function($numero) {\n    \/\/ Retorna TRUE para manter o n\u00famero, se for par\n    return $numero % 2 === 0;\n});\n\nprint_r($pares); \n\/\/ Sa\u00edda: Array ( &#91;1] =&gt; 2 &#91;3] =&gt; 4 ) - Note que as chaves originais s\u00e3o preservadas\n?&gt;\n<\/code><\/pre>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>Dica:<\/strong> O <code>array_filter<\/code> \u00e9 frequentemente usado para remover valores &#8220;false&#8221; (como <code>null<\/code>, <code>0<\/code>, <code>false<\/code> ou <em>strings<\/em> vazias) de um array, bastando omitir o <em>callback<\/em>: <code>array_filter($array);<\/code>.<\/p>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading has-large-font-size\">3. \ud83c\udfaf Fun\u00e7\u00e3o <code>array_reduce<\/code>: Reduzindo a um Valor \u00danico<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">A fun\u00e7\u00e3o <code>array_reduce<\/code> aplica uma fun\u00e7\u00e3o de <em>callback<\/em> acumulativa a cada valor do array, eventualmente <strong>reduzindo-o a um \u00fanico valor<\/strong>.<\/p>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">Sintaxe<\/h3>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">PHP<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>array_reduce(array $array, callable $callback, mixed $initial = null)\n<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">O par\u00e2metro <strong><code>$initial<\/code><\/strong> (valor inicial) \u00e9 crucial, pois define o valor inicial do acumulador (ex: <code>0<\/code> para soma, <code>1<\/code> para produto).<\/p>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">Exemplo: Somando Valores<\/h3>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">A fun\u00e7\u00e3o de <em>callback<\/em> recebe dois argumentos: o <strong>acumulador<\/strong> (resultado parcial) e o <strong>valor atual<\/strong> do array.<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">PHP<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;?php\n$numeros = &#91;1, 2, 3, 4, 5];\n\n$soma = array_reduce($numeros, function($acumulador, $numero) {\n    \/\/ A fun\u00e7\u00e3o deve retornar o novo valor do acumulador\n    return $acumulador + $numero;\n}, 0); \/\/ O '0' \u00e9 o valor inicial do acumulador\n\necho $soma; \/\/ Sa\u00edda: 15\n?&gt;\n<\/code><\/pre>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading has-large-font-size\">4. \ud83e\uddea Exemplos Pr\u00e1ticos Combinados<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Essas fun\u00e7\u00f5es s\u00e3o poderosas quando aplicadas a arrays associativos complexos.<\/p>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">A. Aumentando Pre\u00e7os (Map)<\/h3>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">PHP<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;?php\n$produtos = &#91;\n    &#91;'nome' =&gt; 'Camiseta', 'preco' =&gt; 20],\n    &#91;'nome' =&gt; 'Cal\u00e7a', 'preco' =&gt; 50],\n];\n\n$produtosComAumento = array_map(function($produto) {\n    $produto&#91;'preco'] *= 1.1; \/\/ Aumenta 10%\n    return $produto;\n}, $produtos);\n\n\/\/ $produtosComAumento agora cont\u00e9m os novos pre\u00e7os.\n?&gt;\n<\/code><\/pre>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">B. Filtrando por Condi\u00e7\u00e3o (Filter)<\/h3>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">PHP<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;?php\n$usuarios = &#91;\n    &#91;'nome' =&gt; 'Jo\u00e3o', 'idade' =&gt; 25],\n    &#91;'nome' =&gt; 'Maria', 'idade' =&gt; 17],\n];\n\n$adultos = array_filter($usuarios, function($usuario) {\n    return $usuario&#91;'idade'] &gt;= 18;\n});\n\n\/\/ $adultos cont\u00e9m apenas o array do 'Jo\u00e3o'.\n?&gt;\n<\/code><\/pre>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">C. Calculando M\u00e9dia (Reduce e Count)<\/h3>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">PHP<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;?php\n$notas = &#91;8, 7, 9, 10];\n\n\/\/ 1. Usa array_reduce para somar todas as notas, come\u00e7ando do 0\n$somaTotal = array_reduce($notas, function($soma, $nota) {\n    return $soma + $nota;\n}, 0);\n\n\/\/ 2. Calcula a m\u00e9dia (Soma \/ Contagem)\n$media = $somaTotal \/ count($notas); \n\necho \"M\u00e9dia: \" . $media; \/\/ Sa\u00edda: M\u00e9dia: 8.5\n?&gt;\n<\/code><\/pre>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">\u2705 Conclus\u00e3o Map Filter Reduce PHP<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>Map Filter Reduce PHP<\/strong>: As fun\u00e7\u00f5es <strong><code>array_map<\/code><\/strong>, <strong><code>array_filter<\/code><\/strong> e <strong><code>array_reduce<\/code><\/strong> s\u00e3o fundamentais para adotar o estilo de <strong>Programa\u00e7\u00e3o Funcional<\/strong> em PHP. Elas permitem que a manipula\u00e7\u00e3o de arrays seja feita de maneira <strong>declarativa<\/strong> (&#8220;o que fazer&#8221;, em vez de &#8220;como fazer&#8221;), resultando em c\u00f3digo mais limpo, menos propenso a erros de itera\u00e7\u00e3o manual (como em <em>loops<\/em> <code>for<\/code> tradicionais) e mais f\u00e1cil de entender em projetos colaborativos.<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Toda jornada tem um in\u00edcio, e o in\u00edcio para se tornar um desenvolvedor back-end \u00e9 dominar as seguintes tecnologias, que voc\u00ea encontra aqui mesmo:<\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-8f761849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"\/category\/sql\"><img loading=\"lazy\" decoding=\"async\" width=\"758\" height=\"426\" src=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/05\/Capa-Artigos-2.webp\" alt=\"SQL\" class=\"wp-image-942\" srcset=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/05\/Capa-Artigos-2.webp 758w, https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/05\/Capa-Artigos-2-300x169.webp 300w\" sizes=\"auto, (max-width: 758px) 100vw, 758px\" \/><\/a><figcaption class=\"wp-element-caption\">SQL<\/figcaption><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"\/category\/php\"><img loading=\"lazy\" decoding=\"async\" width=\"758\" height=\"426\" src=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/11\/Capa-PHP.png\" alt=\"Capa Curso PHP\" class=\"wp-image-2835\" srcset=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/11\/Capa-PHP.png 758w, https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/11\/Capa-PHP-300x169.png 300w\" sizes=\"auto, (max-width: 758px) 100vw, 758px\" \/><\/a><figcaption class=\"wp-element-caption\">PHP<\/figcaption><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"\/category\/laravel\"><img loading=\"lazy\" decoding=\"async\" width=\"758\" height=\"426\" src=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/11\/Laravel.webp\" alt=\"Laravel\" class=\"wp-image-1642\" srcset=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/11\/Laravel.webp 758w, https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/11\/Laravel-300x169.webp 300w\" sizes=\"auto, (max-width: 758px) 100vw, 758px\" \/><\/a><figcaption class=\"wp-element-caption\">Laravel<\/figcaption><\/figure>\n<\/div>\n<\/div>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">E se voc\u00ea gosta do nosso conte\u00fado, n\u00e3o deixe de contribuir adquirindo os servi\u00e7os e produtos dos nossos apoiadores e empresas que somos associados:<\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-8f761849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/hostinger.com.br\/?REFERRALCODE=1THIAGO62\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"250\" src=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/03\/hostinger.png\" alt=\"Hospedagem Hostinger\" class=\"wp-image-92\"\/><\/a><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/amzn.to\/3SNDYlc\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"250\" src=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/08\/ofertas-amazon.webp\" alt=\"Ofertas Amazon\" class=\"wp-image-1308\"\/><\/a><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/amzn.to\/3SNKmt0\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"250\" src=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/08\/amazonprime.webp\" alt=\"Amazon Prime\" class=\"wp-image-1307\"\/><\/a><\/figure>\n<\/div>\n<\/div>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p><span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Tempo de leitura: <\/span> <span class=\"rt-time\"> 4<\/span> <span class=\"rt-label rt-postfix\">minutos<\/span><\/span>Map Filter Reduce PHP: A Programa\u00e7\u00e3o Funcional oferece uma abordagem poderosa e declarativa para manipular&#8230;<\/p>\n","protected":false},"author":1,"featured_media":2835,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[],"class_list":["post-1020","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-php","wpcat-11-id"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Map Filter Reduce PHP - BLOG THIAGO ROSSI<\/title>\n<meta name=\"description\" content=\"Map Filter Reduce PHP: Neste artigo, vamos explorar como essas fun\u00e7\u00f5es podem simplificar suas tarefas de programa\u00e7\u00e3o, tornando seu c\u00f3digo...\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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