echo命令的- e标志用来告诉该命令扩展c风格的转义字符，在本示例中，它会把\t转换为制表符。
The -e flag to the echo command tells it to expand C-style escaped characters; in this case, it's going to turn \ t into a TAB character for you.
注意，xml变量受到了针对内部引号和换行符的转义字符的污染。
Notice that the xml variable is polluted with escape characters for the internal quotes and newlines.
您可以随意将字符串传递给 preg_quote()来自动转义它找到的所有regex操作符，如第 1行所示。
Optionally, you can pass a string to preg_quote() to automatically escape any regex operator it finds, as in line 1.
您可以将输出显示为八进制、十六进制、十进制、浮点数、包含反斜杠转义符的ASCII，或者指定的字符(nl表示换行、ht表示水平制表符，等等)。
You can display output as octal, hex, decimal, floating point, ASCII with backslash escapes, or named characters (nl for newline, ht for horizontal TAB, etc.).
对于ASCII文件，您可以指定文件的字段分隔符、转义字符、是否应包括尾随空白，以及文件的编码。
For ASCII files, you can specify the field delimiter for the file, as well as the escape character, whether trailing blanks should be included, and the encoding for the file.
可以使用转义符来显示用户界面元素中的特殊字符，通常对这些用户界面元素会有不同的解释，如解释为菜单项。
You can use an escape character to display a special character in user-interface elements that would normally interpret them differently, such as menu items.
可以使用转义符来显示用户界面元素中的特殊字符，通常对这些用户界面元素会有不同的解释，如解释为菜单项。
You can use an escape character to display a special character in user-interface elements that would normally interpret them differently, such as menu items.
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