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Logical Operators (PHP and Corel Paradox Cross Reference Guide)

By Mike Prestwood

PHP versus Corel Paradox: A side by side comparison between PHP and Corel Paradox.

 
Operators
 

A language symbol used for assignment, comparison, computational, or as a logical.

Logical Operators

[Other Languages] 

Languages Focus

Logical operators perform conditional and, or, and not operations. Some languages support both binary logical operators that link two and unary logical operators negate (make opposite) the truth value of its argument. Finally, some languages short circuit logic. For example, with this or that, if this is an expression returning true, then that is never executed.

PHP:   and, &&, or, ||, !, Xor

PHP logical operators:

and, && and, as in this and that
or, || or, as in this or that
! Not, as in Not This
Xor either or, as in this or that but not both

Syntax Example:
#Given expressions a, b, c, and d:
if !((a && b) && (c || d)) {
  #Do something.
};
Corel Paradox: 

ObjectPAL logical operators:

and and, as in this and that
or or, as in this or that
Not Not, as in Not This

Like VBA, ObjectPAL never short circuits. Given the expression this or that as well as this and that, if this evaluates to false, then that is still executed.

Syntax Example:
;Given expressions a, b, c, and d:
if Not (a and b) and (c or d) then
  ;Do something.
endIf












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