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Next Section： heredoc and nowdoc initialize local variables and class attributes
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Classic introduction to PHP string operations
Chapter1 String basics
1-1 The difference between single quotes and double quotes when declaring strings
1-2 The difference and connection between the grammatical structures of heredoc and nowdoc
1-3 heredoc and nowdoc initialize local variables and class attributes
1-4 Detailed explanation of two syntaxes and examples of variable parsing
1-5 String addition, deletion, modification and search operations
Chapter2 In-depth explanation of string functions
2-1 Substring processing substr and related functions
2-2 String retrieval functions strpos() and strstr()
2-3 String padding and replacement str_pad() and str_replace()
2-4 String length statistics strlen() and mb_strlen(), mb_strwidth()
2-5 Splitting and combining strings explode() and implode()
2-6 Detailed explanation of character type conversion [temporary/permanent/automatic]
2-7 String formatting function [Key points]
2-8 String content filtering and transcoding
2-9 String serialization and JSON processing [Key points]
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PHP string operation source code
Belongs to chapter：Classic introduction to PHP string operations
