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Three ways to represent strings in PHP
- 墨辰丷Original
- 2018-05-16 14:51:555204browse
This article mainly introduces the three representation methods of strings in PHP. Interested friends can refer to it. I hope it will be helpful to everyone.
(1) Use single quotes
The escape characters within single quotes can only be: \\, \'
(2) Use double quotes
Within double quotes, all Escape characters can be used. Such as: \\, \', \", \$, \n, \r, \t
(3) Representation method of long string
Long string representation must be placed in "<<
heredoc can customize the name.
Can directly parse PHP variables.
Notes on strings
1. Within double quotes, the output is the value of the variable. For example: echo "{$name}'s age is 24 years old"
2. Within single quotes, the name of the variable is output, not the value.
3. Within double quotes, if a variable name is followed by A non-empty character will confuse the compiler. The solution to this situation is: it can be followed by a space or punctuation marks (special characters) in English, which will parse the variable. The common method is to add a Braces, {$name}
<!DOCTYPE HTML>
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META name="Generator" content="EditPlus">
<META name="Author" content="">
<META name="Keywords" content="">
<META name="Description" content="">
<style type="text/css">
</style>
<script type="text/javascript">
</script>
</HEAD>
<BODY>
<?php
$name="张三";
$age=24;
$str=<<<heredoc
这是一个很长很长很长的字符串，可以有HTML，js，css代码，但是不能有php代码。可以读取php变量的值，但不能作运算<br>
{$name}的年龄是：{$age}
heredoc;
//heredoc 必须顶头写,且单独一行
echo $str;
?>
</BODY>
</HTML>Related recommendations:
php long string definition method
An example of php long string (here document) definition method
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