Detailed graphic explanation of PHP two-dimensional array deduplication algorithm-PHP Tutorial-php.cn

Detailed graphic explanation of PHP two-dimensional array deduplication algorithm

墨辰丷

Release： 2023-03-28 10:54:01

Original

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The code shared with you in this article is an algorithm for merging two-dimensional arrays and deduplicating them based on key values implemented in PHP. It is very practical. Friends in need can refer to it

Requirements

Now there is the following set of two-dimensional arrays:

array(8) {
 [0]=>
 array(2) {
  ["name"]=>
  string(4) "name"
  ["value"]=>
  string(6) "青叶"
 }
 [1]=>
 array(2) {
  ["name"]=>
  string(5) "phone"
  ["value"]=>
  string(11) "13812341234"
 }
 [2]=>
 array(2) {
  ["name"]=>
  string(12) "fileds_507[]"
  ["value"]=>
  string(12) "我是青叶"
 }
 [3]=>
 array(2) {
  ["name"]=>
  string(12) "fileds_508[]"
  ["value"]=>
  string(6) "合肥"
 }
 [4]=>
 array(2) {
  ["name"]=>
  string(12) "fileds_509[]"
  ["value"]=>
  string(3) "男"
 }
 [5]=>
 array(2) {
  ["name"]=>
  string(12) "fileds_510[]"
  ["value"]=>
  string(6) "足球"
 }
 [6]=>
 array(2) {
  ["name"]=>
  string(12) "fileds_510[]"
  ["value"]=>
  string(6) "棒球"
 }
 [7]=>
 array(2) {
  ["name"]=>
  string(12) "fileds_511[]"
  ["value"]=>
  string(16) "2016-12-15T11:15"
 }
}

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Needs to be in the second dimensional key The values of arrays named name with the same value are merged to form a new array.

For example, the two two-dimensional arrays named fields_510 in the above code should be merged into an array with the values of football and baseball.

Thoughts

When it comes to arrays, we first think of loops in PHP, so it is obviously more suitable to use for loop processing here, which is similar to bubble sorting , one by one comparison, the best processing.

Code

The code is as follows:

$public_info = 数组;
for ($i=0;$i<count($public_info);$i++) {
  for ($j=$i+1;$j<count($public_info);$j++) {
    if ($public_info[$j][&#39;name&#39;] == $public_info[$i][&#39;name&#39;]) {
      $public_info[$i][&#39;value&#39;] .= &#39;,&#39; . $public_info[$j][&#39;value&#39;];
      unset($public_info[$j]);
    }
  }
}

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## Execution result:

array(7) {
 [0]=>
 array(2) {
  ["name"]=>
  string(4) "name"
  ["value"]=>
  string(6) "青叶"
 }
 [1]=>
 array(2) {
  ["name"]=>
  string(5) "phone"
  ["value"]=>
  string(11) "13812341234"
 }
 [2]=>
 array(2) {
  ["name"]=>
  string(12) "fileds_507[]"
  ["value"]=>
  string(12) "我是青叶"
 }
 [3]=>
 array(2) {
  ["name"]=>
  string(12) "fileds_508[]"
  ["value"]=>
  string(6) "合肥"
 }
 [4]=>
 array(2) {
  ["name"]=>
  string(12) "fileds_509[]"
  ["value"]=>
  string(3) "男"
 }
 [5]=>
 array(2) {
  ["name"]=>
  string(12) "fileds_510[]"
  ["value"]=>
  string(13) "足球,棒球"
 }
 [7]=>
 array(2) {
  ["name"]=>
  string(12) "fileds_511[]"
  ["value"]=>
  string(16) "2016-12-15T11:15"
 }
}

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The above is the entire content of this article, I hope it will be helpful to everyone's study.

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