PHP method to convert two-dimensional associative array into string

This article mainly introduces the method of converting two-dimensional associative arrays into strings in PHP, involving PHP array recursive traversal, conversion, deduplication, splicing and other related operation skills. Friends in need can refer to the following

The details are as follows:

Requirements

#In the project, I encountered the problem of converting a two-dimensional associative array to a string. I checked the relevant information and wrote The following program can filter duplicate keywords.

For example, the two-dimensional array of php is as follows:

$name = array(
    "self" => "wangzhengyi",
    "student" => array(
        "chenshan",
        "xiaolingang"
    ),
    "unkmow" => "chaikun",
    "teacher" => array(
        "huangwei",
        "fanwenqing"
    )
);

The final string format to be obtained is:

wangzhengyi,chenshan,xiaolingang,chaikun,huangwei,fanwenqing

Ideas

Method

Use the static keyword and recursion Thoughts to traverse the array

Custom function code (php)

function arrToStr ($array)
{
  // 定义存储所有字符串的数组
  static $r_arr = array();
  if (is_array($array)) {
    foreach ($array as $key => $value) {
      if (is_array($value)) {
        // 递归遍历
        arrToStr($value);
      } else {
        $r_arr[] = $value;
      }
    }
  } else if (is_string($array)) {
      $r_arr[] = $array;
  }
  //数组去重
  $r_arr = array_unique($r_arr);
  $string = implode(",", $r_arr);
  return $string;
}

Full sample code:

Run result:

wangzhengyi,chenshan,xiaolingang,chaikun,huangwei,fanwenqing

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