1<documentation title="Lowercase Control Structure Keywords"> 2 <standard> 3 <![CDATA[ 4 The php keywords if, else, elseif, foreach, for, do, switch, while, try, and catch should be lowercase. 5 ]]> 6 </standard> 7 <code_comparison> 8 <code title="Valid: Lowercase if keyword."> 9 <![CDATA[ 10<em>if</em> ($foo) { 11 $bar = true; 12} 13]]> 14 </code> 15 <code title="Invalid: Uppercase if keyword."> 16 <![CDATA[ 17<em>IF</em> ($foo) { 18 $bar = true; 19} 20]]> 21 </code> 22 </code_comparison> 23</documentation> 24