One, separating from HTML
When PHP parses a file, it looks for a start and end tag, and the tag tells PHP to start and stop interpreting the code. The parsing of this approach allows PHP to be embedded in a variety of documents, which are ignored by the PHP parser for everything except a pair of start and end tags. In most cases, PHP is embedded in an HTML document.
<p>a</p>
<?php Echo ' B ';? >
<p>c</p>
Of course, you can embed a large section of PHP code
<?php
if (1 = = True) {
Echo ' <p>this is true.</p> ';
}else{
Echo ' <p>this is false.</p> ';
}
?>
You can also write the output of Echo,print,print_r.
<p>a</p>
<p><?= ' B '?></p>
<p>c</p>
Second, the instruction separator
PHP is the same as most languages, and every sentence ends with the words ";" Tell the parser I'm done.
Third, note
PHP supports multiple annotation formats
such as C + + style "//comment content"
such as C-style "* * Comment content * * *
such as Shell-style "#注释内容" This article link http://www.cxybl.com/html/wlbc/Php/20130320/37258.html
