1<documentation title="Silenced Errors">
2    <standard>
3    <![CDATA[
4    Suppressing Errors is not allowed.
5    ]]>
6    </standard>
7    <code_comparison>
8        <code title="Valid: isset() is used to verify that a variable exists before trying to use it.">
9        <![CDATA[
10if (<em>isset($foo)</em> && $foo) {
11    echo "Hello\n";
12}
13        ]]>
14        </code>
15        <code title="Invalid: Errors are suppressed.">
16        <![CDATA[
17if (<em>@</em>$foo) {
18    echo "Hello\n";
19}
20        ]]>
21        </code>
22    </code_comparison>
23</documentation>
24