PHP high-end courses

Chapter 1: About PHPStrings 6

1.1 String syntax 6

1.1.1 How to define strings in PHP 6

1.1.2 The role of double quotes 6

1.1.3 Conversion of strings and other types 6

1.1.4 Getting and modifying characters in strings 6

1.2 String principles 6

1.2.1 How strings are stored at the bottom ? 6

1.2.2 String encoding analysis 6

1.2.3 About "binary" security 6

1.3 Character encoding method 6

1.3.1 Bits and bytes 6

1.3.2 ASCIIEncoding 6

1.3.3 UnicodeEncoding 6

1.3.4 Use Unicode to represent Chinese characters in XML 6

1.4 UTF-8 and GBK encoding principles 6

1.4.1 UTF-8 encoding definition 6

1.4.2 UTF-8 encoding rules 6

1.4.3 The difference between with and without BOM 6

1.4.4 UTF-8 takes up space 6

1.4.5 Conversion between Unicode and UTF-8 6

1.4.6 What is signed UTF-8 6

1.4.7 GB2312 and GBK encoding sources 6

1.4.8 About mbstring and iconv 6

The above introduces the high-end PHP courses, including the relevant content. I hope it will be helpful to friends who are interested in PHP tutorials.