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4 years ago
Sometimes the enclosure parameter of the str_getcsv function doesn't work, so I wrote a function that is equivalent to the function

<?php
/**
     * @param string $input
     * @param string $delimiter
     * @param string $enclosure
     * @param string $escape
     * @return array
     * @author TXX
     * @date   2021/1/25 15:03
     */
    function my_str_getcsv($input, $delimiter = ',', $enclosure = '"', $escape = '\\') {
        $output = array();

        if (empty($input) || !is_string($input)) {
            return $output;
        }

        if (preg_match("/". $escape . $enclosure ."/", $input)) {
            while ($strlen = strlen($input)) {
                $pos_delimiter       = strpos($input, $delimiter);    //分隔符出现位置
                $pos_enclosure_start = strpos($input, $enclosure);    //封闭符-开始出现位置

                //有封闭符并封闭符在分隔符之前
                if (is_int($pos_delimiter) && is_int($pos_enclosure_start) && $pos_enclosure_start < $pos_delimiter) {
                    $pos_enclosure_start += 1;
                    $enclosed_str = substr($input, $pos_enclosure_start);    //封闭字符串-开始
                    $pos_enclosure_end = strpos($enclosed_str, $enclosure);    //封闭符-结尾封闭字符串-开始中出现位置
                    $pos_enclosure_end += $pos_enclosure_start;    //封闭符-结尾在原始数据中出现位置

                    if ($pos_enclosure_end <  $pos_delimiter) {
                        //封闭符-结束在分隔符之前,无需进行封闭
                        $output[] = substr($input, 0, $pos_delimiter);
                        $offset = $pos_delimiter + 1;
                    } else {
                        //封闭符-结束在分隔符之后,需要封闭
                        $pos_enclosure_end += 1;
                        $before_enclosed_str = substr($input, 0, $pos_enclosure_end);
                        $enclosed_str = substr($input, $pos_enclosure_end);    //封闭字符串之后的字符串

                        $enclosed_arr = my_str_getcsv($enclosed_str, $delimiter, $enclosure);    //将封闭之后的字符串执行自身
                        $enclosed_arr[0] = $before_enclosed_str . $enclosed_arr[0];

                        $output = array_merge($output, $enclosed_arr);
                        $offset = strlen($input);    //光标移至结尾
                    }
                } else {
                    //无封闭
                    if (!is_int($pos_delimiter)) {
                        //无分隔符,直接将字符串加入输出数组
                        $output[] = $input;
                        //光标移至结尾
                        $offset = strlen($input);
                    } else if ($input == $delimiter) {
                        //如果字符串只剩下分隔符,需保存'',''
                        $output = array_merge($output, ['','']);
                        $offset = $pos_delimiter+1;    //光标移至分隔符后一位
                    } else {
                        $output[] = substr($input, 0, $pos_delimiter);    //将分割符之前的数据
                        $offset = $pos_delimiter+1;    //光标移至分隔符后一位
                    }
                }
                //将字符串更新至光标位置
                $input = substr($input,$offset);
            }
        } else {
            //字符串中不存在封闭符,直接通过分隔符分割
            $input = preg_split("/". $escape . $delimiter ."/", $input);

            if (is_array($input)) {
                $output = $input;
            }
        }

        return $output;
    }

?>
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