string连接全局变量

Question

I have fetched the value from database using query and trace the variable using foreach. I want to get the mail id append with the variable $cc_test.

Initially the variable is empty. for first iteration [e-mail] 2nd iteration [e-mail] and for 3rd [e-mail].

Finally I want to get [e-mail],[e-mail],[e-mail], but now I get '[e-mail],[e-mail]'.

$cc_check is an indexed array print_r($cc_test) in for loop prints [e-mail] for 1st and [e-mail] for 2nd and so on.

$cc_check=asset_status_tracker::where('request_id','=',$data['id'])->where('status_before','!=',null)->get();
$cc_test=''; //dump requestor mail id
foreach($cc_check as $cc_inner){
    $cc_mail=$cc_inner->changed_by;
    print_r($cc_mail);
    $cc_test=users::where('id','=',$cc_mail)->first()->mail;
    $cc_test=$cc_test.','.$cc_test;
    //print_r($cc_test); 
}
print_r($cc_test); //[e-mail],[e-mail],[e-mail]

Answer 1

If I understand you, you don't need a counter, you just need to concatenate all of the values using commas as glue.

You can do this without excess commas or iterating conditions by running implode() after the loop is finished.

Save the emails in an array, and implode the array to generate a string of comma-separated values.

Code:

$emails=[];
foreach($cc_check as $cc_inner){
    $emails[]=users::where('id','=',$cc_inner->changed_by)->first()->mail;
}
$email_string=implode(',',$emails);
echo $email_string;