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MySQL :: MySQL 5.7 Reference Manual :: 13.3.2 Comparison Functions and Operators
It returns 1 for true or 0 if not true. You can use result within an if like so: SELECT IF(5 BETWEEN 1 AND 10, 'yes it is', 'no it is not'); would return "yes it is".
Guide  example  Mysql  compare  operator  between  Tutorial  ReferencE  Documentation  Howto 
november 2016 by racl101
PHP: Error Control Operators - Manual
How to suppress error control in PHP using the @ sign
php  error  @  design  features  handler  operator  programming  webdev 
february 2011 by racl101
PHP: Operator Precedence - Manual
Operator Precedence

The precedence of an operator specifies how "tightly" it binds two expressions together. For example, in the expression 1 + 5 * 3, the answer is 16 and not 18 because the multiplication ("*") operator has a higher precedence than the addition ("+") operator. Parentheses may be used to force precedence, if necessary. For instance: (1 + 5) * 3 evaluates to 18. If operator precedence is equal, left to right associativity is used.

The following table lists the precedence of operators with the highest-precedence operators listed at the top of the table. Operators on the same line have equal precedence, in which case their associativity decides which order to evaluate them in.
Operator Precedence Associativity Operators Additional Information
non-associative clone new clone and new
left [ array()
non-associative ++ -- increment/decrement
non-associative ~ - (int) (float) (string) (array) (object) (bool) @ types
non-associative instanceof types
reference  php  manual  programming  operator  precedence  lessons 
february 2009 by racl101

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