How can I use this function?I take it from other project - php

Question

I am new to php language. I just copy a database connection function from another sample project. The code is below.
public function getRows($conditions = array()){
$sql = 'SELECT ';
$sql .= array_key_exists("select",$conditions)?$conditions['select']:'*';
$sql .= ' FROM '.$this->table;
if(array_key_exists("where",$conditions)){
$sql .= ' WHERE ';
$i = 0;
foreach($conditions['where'] as $key => $value){
$pre = ($i > 0)?' AND ':'';
$sql .= $pre.$key." = '".$value."'";
$i++;
}
}
if(array_key_exists("order_by",$conditions)){
$sql .= ' ORDER BY '.$conditions['order_by'];
}
if(array_key_exists("start",$conditions) && array_key_exists("limit",$conditions)){
$sql .= ' LIMIT '.$conditions['start'].','.$conditions['limit'];
}elseif(!array_key_exists("start",$conditions) && array_key_exists("limit",$conditions)){
$sql .= ' LIMIT '.$conditions['limit'];
}
$query = $this->db->prepare($sql);
$query->execute();
if(array_key_exists("return_type",$conditions) && $conditions['return_type'] != 'all'){
switch($conditions['return_type']){
case 'count':
$data = $query->rowCount();
break;
case 'single':
$data = $query->fetch(PDO::FETCH_ASSOC);
break;
default:
$data = '';
}
}else{
if($query->rowCount() > 0){
$data = $query->fetchAll();
}
}
return !empty($data)?$data:false;
}
Can anyone show me example how to use this function?I want to use WHERE,LIMIT,GROUP_BY and SELECT clauses. When I put in an array like this, I got error message " Invalid argument supplied for foreach()"
$conditions = array('where' => "user_name = '$username'");
$data = $userMo -> getRows($conditions);

Answer 1

you are making a mistake, as its said Invalid argument supplied for foreach()
that means its not getting an array, and think if there are multiple WHERE then??
so try this
$conditions = array('where' => array('user_name' => $username));