PHP的方括号：什么时候引用引号而什么时候不引用？
发布时间：2020-12-13 16:47:14 所属栏目：PHP教程 来源：网络整理
导读：htmlheadtitle/title/headbody?phpif (isset ($_POST['posted'])) {if ($_POST['question1'] == "Lisbon") { echo "You are correct,$_POST[question1] is the right answerhr";}if ($_POST['question1'] != "Lisbon") { echo "You are incorrect,$_POST[que
<html>
<head><title></title></head>
<body>
<?php
if (isset ($_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” 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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