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i have an ajax script that check if the user name is available or not, but it keeps taking the newest user name and the rest are out

$result = mysql_query("Select username from customer");

while ($row = mysql_fetch_array($result)){

$existing_users=array(''.$row['username'].',');     
}

i know i am doing something worng

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1 Answer 1

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4 
$result = mysql_query("select username from customer");

$existing_users = array();

while ($row = mysql_fetch_array($result)){  
   $existing_users[] = $row[ 'username' ];
}

$csv_array = implode( ',', $existing_users );
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