How to remove duplicate array values ​​in php

php method to remove duplicate array values: first open the corresponding PHP code file; then remove duplicate strings through "array_unique($ordernum);"; finally output the deduplicated array.

The operating environment of this article: windows7 system, PHP7.1 version, DELL G3 computer

php removes duplicate values ​​​​in the array and returns the result!

$data = db('order')->field('ordernum')->where(array('user_id' => $user_id))->select();

Query array format

array(16) {
  [0] => array(1) {
    ["ordernum"] => string(18) "190415165656156213"
  }
  [1] => array(1) {
    ["ordernum"] => string(18) "190415165656156213"
  }
  [2] => array(1) {
    ["ordernum"] => string(18) "190415165656156213"
  }
  [3] => array(1) {
    ["ordernum"] => string(18) "190415170056183687"
  }
  [4] => array(1) {
    ["ordernum"] => string(18) "190415170056183687"
  }
  [5] => array(1) {
    ["ordernum"] => string(18) "190415170056183687"
  }
  [6] => array(1) {
    ["ordernum"] => string(18) "190415170345120966"
  }
  [7] => array(1) {
    ["ordernum"] => string(18) "190415170345120966"
  }
  [8] => array(1) {
    ["ordernum"] => string(18) "190415170345120966"
  }
  [9] => array(1) {
    ["ordernum"] => string(18) "190416174929158053"
  }
  [10] => array(1) {
    ["ordernum"] => string(18) "190416174929158053"
  }
  [11] => array(1) {
    ["ordernum"] => string(18) "190416194457158437"
  }
  [12] => array(1) {
    ["ordernum"] => string(18) "190416194457158437"
  }
  [13] => array(1) {
    ["ordernum"] => string(18) "190416195027154990"
  }
  [14] => array(1) {
    ["ordernum"] => string(18) "190416195027154990"
  }
  [15] => array(1) {
    ["ordernum"] => string(18) "190417124518178758"
  }
}
foreach ($data as $k => $v) {
     $ordernum[] = $v['ordernum'];
}

ordernum array format [Recommended learning: PHP video tutorial]

array(16) {
  [0] => string(18) "190415165656156213"
  [1] => string(18) "190415165656156213"
  [2] => string(18) "190415165656156213"
  [3] => string(18) "190415170056183687"
  [4] => string(18) "190415170056183687"
  [5] => string(18) "190415170056183687"
  [6] => string(18) "190415170345120966"
  [7] => string(18) "190415170345120966"
  [8] => string(18) "190415170345120966"
  [9] => string(18) "190416174929158053"
  [10] => string(18) "190416174929158053"
  [11] => string(18) "190416194457158437"
  [12] => string(18) "190416194457158437"
  [13] => string(18) "190416195027154990"
  [14] => string(18) "190416195027154990"
  [15] => string(18) "190417124518178758"
}
$ordernum = array_unique($ordernum); //去掉重复的字符串

ordernum array format after deduplication

array(7) {
  [0] => string(18) "190415165656156213"
  [3] => string(18) "190415170056183687"
  [6] => string(18) "190415170345120966"
  [9] => string(18) "190416174929158053"
  [11] => string(18) "190416194457158437"
  [13] => string(18) "190416195027154990"
  [15] => string(18) "190417124518178758"
}
foreach ($ordernum as $k => $v) {
      $new_ordernum[] = $v; //拆分后的重组
}

The new array format generated

array(7) {
  [0] => string(18) "190415165656156213"
  [1] => string(18) "190415170056183687"
  [2] => string(18) "190415170345120966"
  [3] => string(18) "190416174929158053"
  [4] => string(18) "190416194457158437"
  [5] => string(18) "190416195027154990"
  [6] => string(18) "190417124518178758"
}

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