有没有其他方法可以在PHP中编写字符串文字(不带'或')?

问题描述

我可以在PHP中使用什么代替普通的'和(周围没有(或'或')符号)?

What could I use in PHP in place of the normal ' and (without ' or ") symbols around something?

示例:

echo("Hello, World!")

推荐答案

封装字符串有4种方法，单引号'，双引号"， heredoc 和 nowdoc .

There are 4 ways to encapsulate strings, single quotes ', double quotes ", heredoc and nowdoc.

阅读完整的php .net文章.

http://www.php.net/manual/zh-CN/language.types.string.php#language.types.string.syntax.heredoc

$str = <<<EOD
Example of string
spanning multiple lines
using heredoc syntax.
EOD;

---

Nowdoc

用相同的<<<<用于heredocs的序列，但其后的标识符用单引号引起来，例如<<<'EOT'.关于Heredoc标识符的所有规则也适用于nowdoc标识符，尤其是那些与结束标识符的外观有关的规则.

A nowdoc is identified with the same <<< sequence used for heredocs, but the identifier which follows is enclosed in single quotes, e.g. <<<'EOT'. All the rules for heredoc identifiers also apply to nowdoc identifiers, especially those regarding the appearance of the closing identifier.

http://www.php.net/manual/zh-CN/language.types.string.php#language.types.string.syntax.nowdoc

$str = <<<'EOD'
Example of string
spanning multiple lines
using nowdoc syntax.
EOD;

---

转义

如果要在单引号或双引号字符串中使用文字单引号或双引号，则必须转义它们:

---

Escaping

If you want to use literal single or double quotes within single or double quoted strings, you have to escape them:

$str = '\''; // single quote
$str = "\""; // double quote

如赫伯特所说，您不必在双引号引起来的字符串中转义单引号，也不必在单引号引起来的字符串中转义双引号.

As Herbert noted, you don't have to escape single quotes within a double quoted strings and you don't have to escape double quotes within a single quoted string.

如果必须大量添加引号，请使用 addslashes()函数:

If you have to add quotes on a large scale, use the addslashes() function:

$str = "Is your name O'reilly?";
echo addslashes($str); // Is your name O\'reilly?

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