User-Defined Functions
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function name_of_function (parameters) {Statements;}
Passing a Parameter by Value
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A local copy of the variable is created to be used by the function. Any
changes made to the variable's value are lost when the function exits.
Arithmetic Operators
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Perform mathematical calculation
Function Definition
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Statements within the body of the function.
$result = $interestRate * 12; [Expression]
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Variables: $result
Operators: = and *
Operands: $interestRate
Literals: 12
Assignment Operators
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Used to assign value to a variable, such as =, *=, etc.
Returning Values
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function averageValues ($first, $second, $third) {
$Sum = $first+$second+$third;
$Result = $Sum/3;
Return $result;
}
echo averageValues(6,4,5);
Variable Identifiers
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Must begin with a dollar sign ($), can contain letters, numbers and
underscores; must be space-less, and are case-sensitive
$variable_name = value;
PHP is loosely-typed and follows Dynamic Typing.
Infinite Loop
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A loop statement never ends because its conditional expression is never
FALSE.
'while' Statement
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function name_of_function (parameters) {Statements;}
Passing a Parameter by Value
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A local copy of the variable is created to be used by the function. Any
changes made to the variable's value are lost when the function exits.
Arithmetic Operators
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Perform mathematical calculation
Function Definition
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Statements within the body of the function.
$result = $interestRate * 12; [Expression]
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Variables: $result
Operators: = and *
Operands: $interestRate
Literals: 12
Assignment Operators
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Used to assign value to a variable, such as =, *=, etc.
Returning Values
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function averageValues ($first, $second, $third) {
$Sum = $first+$second+$third;
$Result = $Sum/3;
Return $result;
}
echo averageValues(6,4,5);
Variable Identifiers
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Must begin with a dollar sign ($), can contain letters, numbers and
underscores; must be space-less, and are case-sensitive
$variable_name = value;
PHP is loosely-typed and follows Dynamic Typing.
Infinite Loop
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A loop statement never ends because its conditional expression is never
FALSE.
'while' Statement
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