<?php


if (! function_exists('arrayReduceToOneColumn')) {
	function arrayReduceToOneColumn($array, $column_key) {
		return array_map(function($row) use ($column_key) {
			if (is_callable($column_key)) {
				return $column_key($row);

			} else {
				return $row[$column_key];
			}
		}, $array);
	}
}

if (! function_exists('arrayAddKeyFromColumn')) {
	function arrayAddKeyFromColumn($array, $column_key) {
		$results = array();
		foreach ($array as $row) {
			if (is_callable($column_key)) {
				$key = $column_key($row);
			} else if (is_array($column_key)) {
				$key_parts = [];
				foreach ($column_key as $column_key_item) {
					$key_parts[] = $row[$column_key_item];
				}
				$key = implode('-', $key_parts);
			}else{
				$key = $row[$column_key];
			}
			$results[$key] = $row;
		}
		if (empty($results)) {
			//return new stdClass();
		}
		return $results;
	}
}

if (! function_exists('arrayGroupByColumn')) {
	function arrayGroupByColumn($array, $column_key) {
		$results = array();
		foreach ($array as $k => $v) {
			if (is_callable($column_key)) {
				$key_value = $column_key($v);
			} else {
				$key_value = $v[$column_key];
				
			}
			if (! isset($results[$key_value])) {
				$results[$key_value] = array();
			}
			$results[$key_value][$k] = $v;
		}
		return $results;
	}
}


if (! function_exists('get_csv')) {
	function get_csv($arr, $fields=array(), $sep=";") {
		$str = '';
		if (! empty($arr)) {

			if (empty($fields)) {
				$fields = array_keys($arr[0]);
			}

			$line = array();
			foreach ($fields as $k => $v) {
				if (! is_numeric($k)) {
					$line[] = $k;

				} else {
					$line[] = $v;
				}
			}
			$str .= implode($sep, $line) . PHP_EOL;

			foreach ($arr as $row) {
				$line = array();
				foreach ($fields as $field) {
					$line[] = $row[$field];
				}
				//$str .= implode($sep, $line) . PHP_EOL;
				//$str .= '"' . implode('"' . $sep . '"', str_replace('"', '\\"', $line)) . '"' . PHP_EOL;
				$str .= '"' . implode('"' . $sep . '"', str_replace('"', '""', $line)) . '"' . PHP_EOL;
			}
		}
		return $str;
	}
}