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quantifiers and regular expressions 
    greedy/nongreedy 
query( ) 
    changing data in databases 
    changing format of retrieved rows 
    creating tables 
    deleting data from databases 
    inserting data into databases 
    placeholders
        in UPDATE commands 
        inputting form data 
    retrieving data from databases 
    safely inserting form data 
QUERY_STRING element in $_SERVER auto-global array 
quote( ) 
quotes
    double  [See double-quoted strings]
    matching and balancing (debugging feature) 
    single  [See single quotes]
    turning straight into curly 
quoteSmart( )  2nd 

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