why the array index is undefined?

Question

I am using Yii, and I want to print an index of an array, but I get an error that the index is undefined, here is my code:

 $criteria = new CDbCriteria;
 $criteria->select = 'username, password'; // select fields which you want in output
 $u = Users::model()->findAll($criteria);

 foreach($u as $u)
        $users["$u->username"] = "$u->password";

echo $users['a'];

I printed the array and make sure that a index is exist, so what is the problem here?

var_dump your array and see what indexes are there. Also ($u as $u) is BAAAD idea. — u_mulder
– u_mulder, Commented Aug 24, 2014 at 19:02
nothing to solve here, the index a was stored in the the db with w space so it is ` a`, I think I need to visit the ophthalmologist. — MD.MD
– MD.MD, Commented Aug 24, 2014 at 19:18
i would clean up the db and input functions then, but you can use trim() to just clean it up here... — doublesharp
– doublesharp, Commented Aug 24, 2014 at 19:21

doublesharp · Accepted Answer · 2014-08-24 19:21:05Z

3

When using foreach() you must first specify the array you want to iterate over ($u in this case) and and a different variable after "as" to indicate the variable it should be known as within the scope of the foreach() loop. You must also declare $users to be an array so that you can add items to it. You do not need double quotes when using it is an index or array value.

// create $users array to store values
$users = array();
// iterate over the $u array referring to elements as $user
foreach ( $u as $user ){
    // place properties of $user into the $users array
    $users[$user->username] = $user->password;
}

edited Aug 24, 2014 at 19:21

answered Aug 24, 2014 at 19:10

doublesharp

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MH2K9 · Accepted Answer · 2014-08-24 19:15:19Z

0

Try this

$criteria = new CDbCriteria;
$criteria->select = 'username, password'; 
$u = Users::model()->findAll($criteria);

foreach($u as $val){
    $users["$val->username"] = "$val->password";
}
print_r($users);

edited Aug 24, 2014 at 19:15

answered Aug 24, 2014 at 19:03

MH2K9

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2 Comments

u_mulder Over a year ago

You think that db query returns field value as an index?

doublesharp Over a year ago

Please provide a description of your answer and not just code.

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