(Beginner) Summary of classic PHP interview questions PHP technology

(Beginner) Summary of classic PHP interview questions

1. Difference between double quotation marks and single quotation marks Double quotation marks explain variables, single quotation marks do not explain variables Double quotation marks insert single quotation marks, where if there is a variable in the single quotation mark, variable interpretation The variable name of double quotation marks must be followed by a special character that is not a number, letter, or underscore, or be enclosed in variables
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