PHP时间判断语句

Question

<?php 判断：6点到9点就调用 echo "/css/css1.css"10点到14点就调用 echo "/css/css2.css"15点到17点就调用 echo "/css/css3.css"18点到21点就调用 echo "/css/css4.css"22点到次日点就调用 echo "/css/css4.css"?>

Answer 1

date_default_timezone_set('PRC');
$hour = date('H',time());
if($hour>6 && $hour<9){
$css = "/css/css1.css";
}elseif($hour>10 && $hour<14){
$css = "/css/css2.css";
}elseif($hour>15 && $hour<17){
$css = "/css/css3.css";
}elseif($hour>18 && $hour<21){
$css = "/css/css4.css";
}else{
$css = "/css/css5.css";
}

echo "现在是{$hour}点，调用{$css}";
echo "<link href=\"{$css}\" rel=\"stylesheet\" type=\"text/css\" />";

Answer 2

date_default_timezone_set('PRC');
$hour = date('H',time());
if($hour>6 && $hour<9){
$css = "/css/css1.css";
}elseif($hour>10 && $hour<14){
$css = "/css/css2.css";
}elseif($hour>15 && $hour<17){
$css = "/css/css3.css";
}elseif($hour>18 && $hour<21){
$css = "/css/css4.css";
}else{
$css = "/css/css5.css";
}

echo "现在是{$hour}点，调用{$css}";
echo "<link href=\"{$css}\" rel=\"stylesheet\" type=\"text/css\" />";