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