PHP定界符
echo.php
PHP定界符 alertSTR; $a1 = <<alert0
STR; $a2 = <<alert1
STR; $content = $_REQUEST['vehicle']; if ($content == "Bike"){ echo $a0;} else if ($content == "Car") { echo $a0;echo $a1;} else if ($content == "Airplane") { echo $a0;echo $a1;echo $a2;} ?>