PHP 5.3 Part 2 - Lambda Functions & Closures

Lambda Functions & Closures A Sydney PHP Group Presentation 2 nd October 2008 By Timothy Chandler

Lambda Functions – Lambda Calculus ,[object Object],[object Object],[object Object]

Lambda Functions – Implementations ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Lambda Functions – Implementation Examples ,[object Object],[object Object],s Python Lambda Function func = lambda x : x ** 2 s C++ Lambda Function std :: for_each ( c . begin (), c . end (), std :: cout << _1 * _1 << std :: endl ) ;

Lambda Functions – Implementation Examples ,[object Object],[object Object],s C# v3.0 Lambda Function //Create an delegate instance MathDelegate lambdaFunction = i => i * i ; Execute ( lambdaFunction ) ; s C# Lambda Function //Declare a delegate signature delegate double MathDelegate ( double i ) ; //Create a delegate instance MathDelegate lambdaFunction = delegate ( double i ) { return Math . Pow ( i , 2 ) ; }; /* Passing ' lambdaFunction ' function variable to another method, executing, and returning the result of the function */ double Execute ( MathDelegate lambdaFunction ) { return lambdaFunction ( 100 ) ; }

Lambda Functions – Implementation Examples ,[object Object],s JavaScript Lambda Function ,[object Object],[object Object],[object Object],[object Object],[object Object]

Lambda Functions – The PHP Way ,[object Object],[object Object],s PHP 5.3 Lambda Function ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],s Lambda Function Syntax function & ( parameters ) use ( lexical vars ) { body };

Lambda Functions – The PHP Way ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Closures – The Funarg Problem ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Closures – The PHP Funarg Problem Solution ,[object Object],[object Object]

Closures – The “use” Keyword ,[object Object],[object Object],s Lambda Function Closure ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Closures – The “use” Keyword ,[object Object],[object Object],s Lambda Function Closure – As an Anonymous Function ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Closures – “use” as reference or copy ,[object Object],[object Object],[object Object]

Closures – “use” by reference ,[object Object],[object Object],[object Object],[object Object],[object Object],s Referenced Variable Import

Lifecycle ,[object Object],[object Object],[object Object],s Lambda Function in Class Declaration ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Parse error : syntax error, unexpected T_FUNCTION in D:evelopmentwwhp5.3ambda.php on line 4

[object Object],[object Object],[object Object],Lifecycle s Lifecycle Example 1 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],object(foo)#1 (1) { ["lambda"]=> object(Closure)#2 (0) { } } NULL Hello World

[object Object],[object Object],[object Object],Lifecycle s Lifecycle Example 2 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Hello World

[object Object],[object Object],[object Object],Lifecycle – Objects s Lifecycle Example 3 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],__construct() Bar NULL Bar __destruct() Fatal error Function name must be a string in D:evelopmentwwhp5.3ambda.php on line 31

[object Object],[object Object],[object Object],Lifecycle – Objects

[object Object],[object Object],[object Object],[object Object],Object Orientation

Object Orientation ,[object Object],[object Object],s Static Lambda Functions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],object(foo)#1 (0) { } NULL

[object Object],[object Object],[object Object],Object Orientation

Object Orientation ,[object Object],[object Object],s Invokable Objects ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Hello World

Thank you. ,[object Object],[object Object],[object Object],[object Object],[object Object]

PHP 5.3 Part 2 - Lambda Functions & Closures

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PHP 5.3 Part 2 - Lambda Functions & Closures

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