PHP array_diff() convert to string [closed]

Question

Closed. This question needs details or clarity. It is not currently accepting answers.

Want to improve this question? As written, this question is lacking some of the information it needs to be answered. If the author adds details in comments, consider editing them into the question. Once there's sufficient detail to answer, vote to reopen the question.

Closed last year.

Improve this question

Hi I'm trying to remove the results of one array from another and store the result as a comma seperated list of strings.

This is the code I have so far:

function bpdev_include_users(){
 //list of users to exclude

global $wpdb;
$frndsof = array();
$frnds = array();
$result = array();
$friendsid = array();

$currentuser_id = get_current_user_id();
echo $currentuser_id;
?><br />
<?php

$sql= "SELECT friend_user_id  FROM wp_bp_friends WHERE initiator_user_id='".$currentuser_id."' AND is_confirmed = 1";
$friendsid = $wpdb->get_results($sql);
print_r($friendsid);
?><br />
<?php
$myexcluded_users=array();
foreach($friendsid as $oneitem){
    $myexcluded_users[]=$oneitem->friend_user_id;
} 
$excluded_user =implode(", ",$myexcluded_users);
echo $excluded_user;
?><br />
<?php

foreach ( $friendsid as $row )
{
$sql1= "SELECT friend_user_id  FROM wp_bp_friends WHERE initiator_user_id='".$row->friend_user_id."' AND is_confirmed = 1";
$ffid = $wpdb->get_results($sql1);
print_r($ffid);
?><br />
<?php
}

More code (sorry weird formatting issues...)

$my_users = array();foreach($ffid as $oneitem){
    $my_users[]=$oneitem->friend_user_id;
} 
$my_user =implode(", ",$my_users);
echo $my_user;


$sql2= "SELECT user_id FROM wp_bp_xprofile_data";
$users = $wpdb->get_results($sql2);



$result = array_merge($friendsid, $ffid);


//$excluded_user = array_diff($users , $result); //comma separated ids of users whom you want to exclude

}


bpdev_include_users();

What I'm trying to end up with is

$excluded_user = 1, 2, 3, 4;

Currently I'm getting an error at the array_diff stage: Object of class stdClass could not be converted to string

This is the output from the above code

1

Array ( [0] => stdClass Object ( [friend_user_id] => 54 ) [1] => stdClass Object ( [friend_user_id] => 48 ) [2] => stdClass Object ( [friend_user_id] => 61 ) )

54, 48, 61

Array ( [0] => stdClass Object ( [friend_user_id] => 62 ) [1] => stdClass Object ( [friend_user_id] => 51 ) [2] => stdClass Object ( [friend_user_id] => 60 ) [3] => stdClass Object ( [friend_user_id] => 65 ) [4] => stdClass Object ( [friend_user_id] => 56 ) ) Array ( [0] => stdClass Object ( [friend_user_id] => 43 ) [1] => stdClass Object ( [friend_user_id] => 50 ) [2] => stdClass Object ( [friend_user_id] => 64 ) [3] => stdClass Object ( [friend_user_id] => 45 ) [4] => stdClass Object ( [friend_user_id] => 44 ) ) Array ( [0] => stdClass Object ( [friend_user_id] => 57 ) )

57

Thanks in advance for any help!

Are you sure it should be $ffid = $wpdb->get_results($sql1) and not $ffid .= $wpdb->get_results($sql1) ? (concatenation) — Maximus2012
– Maximus2012, Commented Feb 24, 2015 at 17:35

emotality · Accepted Answer · 2023-07-06 12:29:12Z

1

You need to access the stdclass in the array.

$myexcluded_users = [];

foreach ($excluded_user as $oneitem) {
    $myexcluded_users[] = $oneitem->friend_user_id;
} 

$excluded_user = implode(', ', $myexcluded_users);

Edit:

So this line,

$excluded_user = array_diff($users , $result); // comma separated ids of users whom you want to exclude

both $users and $result are the arrays that have the stdClass inside them?

How about this?

$usersarray = [];
    
foreach ($users as $oneitem) {
    $usersarray[] = $oneitem->friend_user_id;
} 

$resultarray = [];
    
foreach ($result as $oneitem) {
    $resultarray[] = $oneitem->friend_user_id;
} 

$excluded_user = array_diff($usersarray, $resultarray);
$excluded_user = implode(', ', $excluded_user);

edited Jul 6, 2023 at 12:29

emotality

13.1k4 gold badges43 silver badges60 bronze badges

answered Feb 24, 2015 at 17:51

greg_diesel

2,9701 gold badge18 silver badges24 bronze badges

Sign up to request clarification or add additional context in comments.

6 Comments

Ian Butler Over a year ago

thanks for your suggestion - I think it has definitely put me in the right direction. I've edited the original question now to reflect how I've tried to implement this

greg_diesel Over a year ago

I'm confused by your edit. The snippet I posted just needed to be added at the bottom after $excluded_user = array_diff($users , $result); //comma separated ids of users whom you want to exclude It takes the current result that you had in $excluded_user and formats it to the output that you wanted.

Ian Butler Over a year ago

I cant include $excluded_user = array_diff($users , $result); //comma separated ids of users whom you want to exclude - that's what gives me the Object of class stdClass could not be converted to string

Ian Butler Over a year ago

thanks for your help and patience - I've accepted this as the answer. There is still one part which is confusing me though. When I use print_r($ffid); it outputs 3 arrays and using implode and echo outputs the id 57, ignoring the id's in the other arrays (you can see this output in my question). This messes up the result in $excluded_user... Have you any idea why it might put the $ffid into 3 arrays?

Ian Butler Over a year ago

just figured it out $friendsid has 3 results,hence the 3 arrays.... Just need to work out how to store them all in $results now!

|

Utkarsh Dixit · Accepted Answer · 2015-02-24 17:35:25Z

1

You can use implode() for this purpose. This function will separate the array using the string you specified. Check out this reference Use the code below

echo implode(", ", array("HELLO", "WORLD", "lan", "Butler")); // Will Seprate the array

Hope this helps you

answered Feb 24, 2015 at 17:35

Utkarsh Dixit

4,2853 gold badges18 silver badges42 bronze badges

1 Comment

Ian Butler Over a year ago

that also gives the error Object of class stdClass could not be converted to string

Collectives™ on Stack Overflow

PHP array_diff() convert to string [closed]

2 Answers 2

6 Comments

1 Comment

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

6 Comments

1 Comment

Related