测试PHP的字符串类型(string)-Part 1

下面的代码都是在PHP命令行模式下执行的。

字符串可以用两个单引号定义。

php > echo 'a string defined with single quotes';
a string defined with single quotes

字符串可以分多行来定义。

php > echo 'a string defined with single quotes
php ' but with multiple lines
php ' did you notice it?';
a string defined with single quotes
but with multiple lines
did you notice it?

如果想在单引号定义的字符串里嵌入单引号，需要用反斜杠转义。

php > echo 'if you need to embed single quote in such a string, use slash. like /'';
if you need to embed single quote in such a string, use slash. like '

如果想在单引号定义的字符串里嵌入双引号，没有特别需要处理的。只要像使用一般字符一样就可以了。

php > echo 'if you need to embed double quote in such a string, just use it as other characters like "hello"';
if you need to embed double quote in such a string, just use it as other characters like "hello"

如果想在单引号定义的字符串里嵌入反斜杠，且反斜扛是最后一个字符，那就用两个反斜杠。
php > echo 'if backslash is the last character, then double it like//';
if backslash is the last character, then double it like/

如果想在单引号定义的字符串里嵌入反斜杠，而反斜扛不是最后一个字符，那可以用一个反斜杠或者两个反斜杠，其结果都是输出一个反斜杠。

php > echo 'if backslash is NOT the last character, then just use it like / or //.';
if backslash is NOT the last character, then just use it like / or /.