Why are html and php mixed? Four ways to mix html and php
The following editor will bring you a summary of four methods of PHP/HTML mixed writing. The editor thinks it’s pretty good, so I’ll share it with you now and give it as a reference. Let’s follow the editor and take a look.
PHP is a back-end language. In order to output it to the browser for the browser to display, it is inevitable to output HTML code. The following is an introduction to the three methods I have used. A PHP/HTML hybrid method
1. Single/double quotation mark enclosing method
This is the most basic method. The usage is like As follows
<?php
echo '
<!DOCTYPE html>
<html>
<head>
<title> </title>
</head>
<body>
<span>测试页面</span>
</body>
</html>
';
?>This is the simplest method, just wrap it with single quotes
As for the difference between double quotes and single quotes, it lies inThe former parses the quotes The latter does not parse variables within quotes, see the following example
<?php $Content='Hello!'; echo "$Content"; echo '<br>'; echo '$Content'; ?>
Output
1 Hello!
2 $Content
It can be seen that the variable name in the string surrounded by double quotes is automatically parsed into the variable value, while the variable name
## is still displayed when surrounded by single quotes. #There are two disadvantages to writing this way
1. If the output content contains single/double quotes, it will be extremely difficult to process, because PHP cannot determine whether the quotes belong to the program or not. Output content, so an error will be reported 2. Write some modern text in this way
2. Use HEREDOC/ NOWDOC##HEREDOC and NOWDOC are a new feature that PHP5.3 began to support. It allows the use of a custom identifier to surround text in the program, while HEREDOC and NOWDOC The relationship is similar to that between double quotes and single quotes.
The former parses the variables in the block, while the latter does not parse the variables in the blockIntroduced below The usage of HEREDOC and NOWDOC<?php
$Content='Hello!';
//下面写出了一个HEREDOC，其中标识LABEL可以自定义为任何字符串，但要保证开头的标识和结尾的标识一样
echo <<<LABEL
$Content
LABEL;
//结尾的方法：另起一行，打上LABEL。注意结尾的标识前面和后面不要插入任何字符，空格也不行
echo '<br>';//为了演示方便换行
//NOWDOC和HEREDOC的书写方式差别在于NOWDOC的标识符需要用单引号包围
echo <<<'LABEL'
$Content
LABEL;
//其他无异
?>
wiki.php.net/rfc /heredoc-with-double-quotesWriting with HEREDOC/NOWDOC perfectly solves the problem of surrounding quotation marks, but it still does not solve the problem of invalid syntax coloring
3. Embed PHP program blocks in HTML (recommended)
This is a very suitable method, and this method is widely used in WordPress templates such as
<?php
//首先在这里写好相关的调用代码
function OutputTitle(){
echo 'TestPage';
}
function OutputContent(){
echo 'Hello!';
}
//然后再下面调用相关函数就可以了
?>
<!DOCTYPE html>
<html>
<head>
<title><?php OutputTitle(); ?></title>
</head>
<body>
<span><?php OutputContent(); ?></span>
</body>
</html>template engine As the importance of the front-end is increasing day by day in the entire web development, now Front-end/back-end engineers are gradually being separated into two professions. Therefore, in order to ensure that front-end/back-end engineers can cooperate with each other and make the things developed by front-end development and back-end development more perfect, a series of front-ends have gradually been spawned Template
engines, such as Smarty. The implementation code written using Smarty is very readable, which makes the separation of front/back end more efficient and convenient. Interested students can search and find outThe above is the detailed content of Why are html and php mixed? Four ways to mix html and php. For more information, please follow other related articles on the PHP Chinese website!
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