mysql select query with php foreach

问题

I am trying to write a function where I will get the id's from a table and then I want to have the all the id's in the array so that these id's used in another function to be processed. I wrote the below but it's not array method and also it's printing the id's twice. I searched online and they all suggest to use mysql_fetch_assoc and remove for each..but in my case I am using the zend adapter fetchAll to get the output. Please let me know how I can get the id's in the array and also only once so that I can pass this array and each id is processed one by one..right now with what I have is just stopping after the first one is processed. Thanks.

function getID()
  {
    $sql = 'SELECT user_id FROM users WHERE ready = "1" ';
    $idList = $this->getAdapter()->fetchAll($sql);
    if(!empty($idList)) {
        foreach($idList as $value) {
            echo $value['user_id']."\n";
        }
    }
   }


Output 
201
223
231
334
201
223
231
334

回答1:

Try this.

function getIDs() {
  $result = array();
  $sql = 'SELECT user_id FROM users WHERE ready = "1" ';
  $idList = $this->getAdapter()->fetchAll($sql);
  if(!empty($idList)) {
    foreach($idList as $value) {
      echo $value['user_id']."\n";
      array_push(result, $value['user_id']);
    }
  }
  // $result = array_unique($result);
  return $result;
}

You will then get the array by:

$bunch_of_ids = getIDs();

You should figure out why they are being duplicated, but in case you can't, you can make the array content unique with:

$result = array_unique($result);

Put that right before return $result; inside the function. I've commented it in the function above because would be much better to find out why it's being duplicated in the first place. As I noted in a comment to your question, please make sure that the function isn't being called twice. Also check the database for duplicate entries (although that shouldn't be possible if 'user_id' is a primary key).

(Please also note that I renamed the function to getIDs() because it makes no sense to have a getID() function returning multiple values. :) )

回答2:

this function is correct, but if you want an array:

if(!empty($idList)) {
    foreach($idList as $value) {
        $array[] = $value['user_id'];
    }

and if 'user_id' really are repeated:

$array = array_unique($array);

回答3:

Your function looks correct to me, are you sure you are not calling it twice to explain the double output?

回答4:

<?php
 function getID(){
 $get = mysql_query("SELECT user_id FROM users WHERE ready = '1'", $yhteys);

  for ($i = 0; $i < mysql_num_rows($get); $i++) {
  $id = mysql_result($get, $i, "user_id");
  $userids[] = $id;
  }
 return $userids;
 }
 ?>

回答5:

I think that code is fine. I don't see any mistake there.

来源：https://stackoverflow.com/questions/7417275/mysql-select-query-with-php-foreach

标签

php

zend-framework

select

foreach