PHP two-dimensional array deduplication example analysis-PHP Tutorial-php.cn

PHP two-dimensional array deduplication example analysis

高洛峰

Release： 2023-03-03 13:42:01

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This article analyzes the method of deduplication of two-dimensional arrays in PHP through examples. Share it with everyone for your reference, the details are as follows:

Everyone knows that one-dimensional arrays can reuse the system function array_unique($arr)

And today I used a two-dimensional array, and I also want to reuse it. Baidu has a lot of them. Convert 2D to 1D and then use array_unique($arr)

I was very annoyed by it, so I decided to write one myself. Simpler and easier to understand than his, record it for later use

header(&#39;content-type:text/html;charset=utf8&#39;);
$arr = array(
array(&#39;id&#39;=>1,&#39;psid&#39;=>&#39;P101&#39;,&#39;fullname&#39;=>&#39;课程计划全称 101&#39;,&#39;userid&#39;=>4),
array(&#39;id&#39;=>1,&#39;psid&#39;=>&#39;P101&#39;,&#39;fullname&#39;=>&#39;课程计划全称 101&#39;,&#39;userid&#39;=>3),
array(&#39;id&#39;=>1,&#39;psid&#39;=>&#39;P101&#39;,&#39;fullname&#39;=>&#39;课程计划全称 101&#39;,&#39;userid&#39;=>3),
array(&#39;id&#39;=>1,&#39;psid&#39;=>&#39;P101&#39;,&#39;fullname&#39;=>&#39;课程计划全称 101&#39;,&#39;userid&#39;=>2),
array(&#39;id&#39;=>2,&#39;psid&#39;=>&#39;P102&#39;,&#39;fullname&#39;=>&#39;新课程计划&#39;,&#39;userid&#39;=>4),
array(&#39;id&#39;=>2,&#39;psid&#39;=>&#39;P102&#39;,&#39;fullname&#39;=>&#39;新课程计划&#39;,&#39;userid&#39;=>3),
array(&#39;id&#39;=>2,&#39;psid&#39;=>&#39;P102&#39;,&#39;fullname&#39;=>&#39;新课程计划&#39;,&#39;userid&#39;=>3),
array(&#39;id&#39;=>2,&#39;psid&#39;=>&#39;P102&#39;,&#39;fullname&#39;=>&#39;新课程计划&#39;,&#39;userid&#39;=>2)
);
$arr = er_array_unique($arr);
foreach($arr as $v){
  echo &#39;id: &#39;.$v[&#39;id&#39;].&#39;psid: &#39;.$v[&#39;psid&#39;].&#39; fullname: &#39;.$v[&#39;fullname&#39;].&#39; userid: &#39;.$v[&#39;userid&#39;].&#39;<br/>&#39;;
}
//二维数组简单去重
function er_array_unique($arr){
  $newarr = array();
  if(is_array($arr)){
    foreach($arr as $v){
      if(!in_array($v,$newarr,true)){
        $newarr[] = $v;
      }
    }
  }else{
     return false;
  }
  return $newarr;
}

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Print result:

id: 1psid: P101 fullname: 课程计划全称 101 userid: 4
id: 1psid: P101 fullname: 课程计划全称 101 userid: 3
id: 1psid: P101 fullname: 课程计划全称 101 userid: 2
id: 2psid: P102 fullname: 新课程计划 userid: 4
id: 2psid: P102 fullname: 新课程计划 userid: 3
id: 2psid: P102 fullname: 新课程计划 userid: 2

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Note: in_array($need,$arr,$strict)

in this method Prior to PHP version 4.2.0, $need was not allowed to be an array. If $stric is true, it will strictly match the types to be found in $need and $arr