Shulou(Shulou.com)06/01 Report--

String reference variables in php are mainly different database operation strings.

1, normal string reference variable

a. The outer layer must quote double quotation marks

b. Variables in a string can be written as: $s or {$s}

two。 Database operation string (database operation instruction)

a. Double quotes must be used in the outer layer of a string

b. Variables must use curly braces {} (except when assigning string attributes), such as:

`c. When a variable is required to be assigned to a database property or to perform a logical operation, the type of the corresponding data attribute is required, such as

The attribute title,authordid,content in the database in the above code is a string, so the variable should be in single quotation marks'{$title}'or'$title',.

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