<html> <head><title></title></head> <body> <?PHP if (isset ($_POST['posted'])) { if ($_POST['question1'] == "Lisbon") { echo "You are correct,$_POST[question1] is the right answer<hr>"; } if ($_POST['question1'] != "Lisbon") { echo "You are incorrect,$_POST[question1] is not. the right answer<hr>"; } } ?> <form method="POST" action="quiz.PHP"> <input type="hidden" name="posted" value="true"> What is the capital of Portugal? <br> <br> <input name=''question1" type=''radio" value=''Porto''> Porto <br> <input name=''question1" type="radio" value=''Lisbon''> Lisbon <br> <input name="question1" type="radio" value=''Madrid''> Madrid <br> <br> <input type=''submit''> </form> </body> </html>
这是整个部分,它来自PDF.但事实上,他们没有说明为什么他们在if语句中使用”作为question1但在echo语句中没有使用引号.
简而言之：为什么$_POST [‘question1’]在if语句中有”
以及为什么$_POST [question1]在echo语句中没有.它们是同一个变量.
谢谢.
解决方法
始终使用引号(对于字符串键),除非在双引号字符串中.请参见手册的
the string parsing section.
$juices = array("apple","orange","koolaid1" => "purple");
echo "He drank some $juices[0] juice.".PHP_EOL;
echo "He drank some $juices[1] juice.".PHP_EOL;
echo "He drank some juice made of $juice[0]s.".PHP_EOL; // Won't work
echo "He drank some $juices[koolaid1] juice.".PHP_EOL;
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