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    <p>The isset will only evaluate variables, no functions nor function return values are allowed. From the <a href="http://php.net/manual/en/function.isset.php" rel="nofollow">PHP Manual (isset)</a>:</p> <pre><code>&lt;?php $a = array ('test' =&gt; 1, 'hello' =&gt; NULL, 'pie' =&gt; array('a' =&gt; 'apple')); var_dump(isset($a['test'])); // TRUE var_dump(isset($a['foo'])); // FALSE var_dump(isset($a['hello'])); // FALSE // The key 'hello' equals NULL so is considered unset // If you want to check for NULL key values then try: var_dump(array_key_exists('hello', $a)); // TRUE // Checking deeper array values var_dump(isset($a['pie']['a'])); // TRUE var_dump(isset($a['pie']['b'])); // FALSE var_dump(isset($a['cake']['a']['b'])); // FALSE </code></pre> <p>If you put multiple conditions in an if statement using the AND operator, the if statement will stop evaluating as soon as it find the first false condition. In the following example foo() will never be called: </p> <pre><code>$a = (false &amp;&amp; foo()); $c = (false and foo()); </code></pre> <p>In a similar way you can give the isset multiple parameters to evaluate. The manual says "If multiple parameters are supplied then isset() will return TRUE only if all of the parameters are set. Evaluation goes from left to right and stops as soon as an unset variable is encountered." :</p> <pre><code>$a = "test"; $b = "anothertest"; var_dump(isset($a)); // TRUE var_dump(isset($a, $b)); // TRUE unset ($a); var_dump(isset($a)); // FALSE var_dump(isset($a, $b)); // FALSE </code></pre>
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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