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Conditional Control Structures

  • Statements can be grouped together in statement groups so that the entire group of statements can be executed as if it were one statement.
  • Conditional control structures are used to conditionally execute statement groups when a required ‘test condition’ is met.
  • An if statement evaluates whether a test condition is TRUE , and if so, it executes a corresponding statement group.
  • An else statement is a conditional control structure associated with an if statement. When an if statement's test condition is FALSE, an associated else statement's statement group will get executed instead.
  • The isset() construct tests if a variable has been previously declared, and if so, that its value is not NULL . It accepts a variable as its argument and returns a boolean value.
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Conditional Control Structures

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Computer Science: Introduction to PHP