The difference between string definitions in single quotes and double quotes-PHP string processing (Jade Girl Heart Sutra version)-php.cn

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PHP string processing (Jade Girl Heart Sutra version)

Chapter1 Analysis of three definition methods of string
1-1 The difference between string definitions in single quotes and double quotes
1-2 Delimiter definition string application
1-3 Use {} to add, delete, check and modify a string
Chapter2 String function library practice-validation of form fields
2-1 Use of string function library
2-2 Generation of random verification codes
2-3 Validation of username field
2-4 Validation of password fields
2-5 Verification of form field verification codes
2-6 Validation of email fields
2-7 Display of user information

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