PHP high-end courses

: This article mainly introduces PHP high-end courses. if you are interested in PHP tutorials, you can refer to them. Chapter 1: PHP string 6

1.1 string syntax 6

1.1.1 PHP string definition method 6

1.1.2 double quotation marks 6

1.1.3 conversion of strings and other types 6

1.1.4 get and modify character 6 in a string

1.2 string Principle 6

1.2.1 How are strings stored at the underlying layer? 6

1.2.2 string encoding parsing 6

1.2.3 about "binary" security 6

Encoding method of 1.3 Characters 6

1.3.1 bit and byte 6

1.3.2 ASCII code 6

1.3.3 Unicode encoding 6

1.3.4 use Unicode to represent Chinese characters 6 in XML

1.4 UTF-8 and GBK coding Principle 6

1.4.1 Definition of UTF-8 encoding 6

1.4.2 UTF-8 coding law 6

1.4.3 differences between BOM and BOM 6

1.4.4 UTF-8 space 6

1.4.5 conversion between Unicode and UTF-8 6

1.4.6 what is a signed UTF-8 6

1.4.7 GB2312 and GBK encoding source 6

1.4.8 about mbstring and iconv 6

The above describes the PHP high-end courses, including some content, and hope to help those who are interested in PHP tutorials.