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POProblems with parent / inheritance in PHP
 

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  1. POProblems with parent / inheritance in PHP
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    <p><strong>EDIT: I got this working now. I have updated the code:</strong></p> <p>I've looked at a few examples in here, and they all look logical. But I can't get it to work. I have a class that extends my Data Access Layer (DAL). I would like to call parent class to retrieve DB results. What am I doig wrong?</p> <p>DAL class</p> <pre><code>class DAL { protected $username; // the username for db connect protected $pwd; // the pwd to use when connecting protected $host; // the host to which one connects protected $dbname; // the db to select public $conn; // reference to the db link resource public $db; // result of db_select public $query_result; // the stored result of the last query you ran public function __construct() { $this-&gt;username = ""; $this-&gt;pwd = ""; $this-&gt;host = ""; $this-&gt;dbname = ""; } public function connect() { /* connects to DB here */ } private function query($sql) { /* Executes the query here and stores the result in $this-&gt;query_result */ } public function getAllCountries() { $sql =" SELECT id, name FROM country"; //Process query $this-&gt;query($sql); if($this-&gt;query_result) return $this-&gt;query_result; } } </code></pre> <p>And this is my other class</p> <pre><code>class myOtherClass extends DAL{ public function __construct() { parent::__construct(); parent::connect(); } public function getCountryListBox() { $result = parent::getAllCountries(); if($result) { $selectbox = "&lt;select id='countryListBox' name='countryListBox'&gt;"; while ($row = mysql_fetch_array($result)) { $selectbox .= "&lt;option value='".($row['id'])."'&gt;".($row['name'])."&lt;/option&gt;"; } $selectbox .= "&lt;/select&gt;"; } else $selectbox = "Countries could not be retrievd from database."; return $selectbox; } } </code></pre> <p>This is the code in my template:</p> <pre><code>$sl = new myOtherClass(); echo '&lt;form id="label_data_form"&gt;'; $sl-&gt;getCountryListBox(); echo '&lt;/form&gt;'; </code></pre>
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    1. COI'm getting a lot of good feedback here. I'm testing this and that now.
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    2. COAs I said in my response, you're not handling all the possible cases in getAllCountries() and probably in query().
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    3. COI'm a bit confused by some answers here now. SHould I use $this-> or should I use paretn:: ?
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