Code to pretty-output JSON to files

index.php

<?php

include 'JsonTextOutputter.php';

$dados = [
	'arroz' => 16.1,
	'feijao' => ['preto','branco','fradinho','azuki','carioca'],
	'chip' => [
		'fabricante' => 'Intel',
		'modelo' => 'i9-12800',
		'preco' => 3509.11,
		'aplicacoes' => [
			'tipos' => ['cientifico','profissional','caseiro','gamer','editor de video'],
			'ranks' => [
				['tier' => 1, 'quaker' => 1.00821],
				['tier' => 2, 'quaker' => 1.00639],
				['tier' => 3, 'quaker' => 1.00397],
				['tier' => 4, 'quaker' => 1.00182],
				['tier' => 5, 'quaker' => 1.00091],
			]
		],
	]
];

$dados_json = json_encode($dados);

echo '<pre>' . JsonTextOutputter::print($dados_json) . '</pre>';

file_put_contents('./json-pretty-output.txt', JsonTextOutputter::print($dados_json));

JsonTextOutputter.php

<?php

/**
 * @class \JsonTextOutputter
 * @author Kendall Hopkins @link https://stackoverflow.com/users/188044/kendall-hopkins
 * @author George G @link https://stackoverflow.com/users/3172092/george-g
 * @source https://stackoverflow.com/a/9776726/21986565 
 **/
class JsonTextOutputter
{
	/**
	 * Outputs pretty-formatted JSON string
	 *
	 * @param string $json
	 * @return string
	 **/
	public static function print($json)
	{
	    $result = '';
	    $level = 0;
	    $in_quotes = false;
	    $in_escape = false;
	    $ends_line_level = NULL;
	    $json_length = strlen( $json );
		//
	    for( $i = 0; $i < $json_length; $i++ ) {
	    	// current char
	        $char = $json[$i];
	        // indentation
	        $new_line_level = NULL;
	        // partial results
	        $post = "";
	        //
	        // if no indent set...
	        //
	        if( $ends_line_level !== NULL ) {
	            $new_line_level = $ends_line_level;
	            $ends_line_level = NULL;
	        }
	        //
	        // controls indentation level
	        //
	        if ($in_escape) {
	            $in_escape = false;
	        } else if( $char === '"' ) {
	            $in_quotes = !$in_quotes;
	        } else if( ! $in_quotes ) {
	            switch( $char ) {
	                case '}':
	                case ']':
	                    $level--;
	                    $ends_line_level = NULL;
	                    $new_line_level = $level;
	                    break;
	                case '{':
	                case '[':
	                    $level++;
	                case ',':
	                    $ends_line_level = $level;
	                    break;
	                case ':':
	                    $post = " ";
	                    break;
	                case " ":
	                case "\t":
	                case "\n":
	                case "\r":
	                    $char = "";
	                    $ends_line_level = $new_line_level;
	                    $new_line_level = NULL;
	                    break;
	            }
	        } elseif ($char === '\\') {
	            $in_escape = true;
	        }
	        //
	        // applies current indented level
	        //
	        if ($new_line_level !== NULL) {
	            $result .= "\n".str_repeat( "\t", $new_line_level );
	        }
	        // aggregates partials to full result
	        $result .= $char.$post;
	    }
		//
	    return $result;
	}
}