3: Working with Dates and Times in .NET

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3: Working with Dates and Times
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A calendar generated with the PEAR Calendar class
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The Calendar package is fairly sophisticated, and enables a developer to create and customize a variety of different calendar types There isn t enough space here to discuss it in detail, so you should take a look at the examples provided with the package to understand what you can do with it
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318 Working with Extreme Date Values
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You want to work with dates outside the range 01-01-1970 to 19-01-2038
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Use the ADOdb Date Library:
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< php // include ADODB date library include "adodb-timeincphp";
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PHP Programming Solutions
// get date representation for 01-Mar-1890 // returns "01-Mar-1890" echo adodb_date("d-M-Y", adodb_mktime(4,31,56,3,1,1890)) " \n"; // get date representation for 11-Jul-3690 10:31 AM // result: "11-Jul-3690 10:31:09 AM" echo adodb_gmdate("d-M-Y h:i:s A", adodb_mktime(16,1,9,07,11,3690)) " \n"; // get date representation for 11-Jul-3690 04:01 PM // result: "11-Jul-3690 04:01:09 PM" echo adodb_gmdate("d-M-Y h:i:s A", adodb_gmmktime(16,1,9,07,11,3690)); >
Comments
Because PHP uses 32-bit signed integers to represent timestamps, the valid range of a PHP timestamp is usually 1901 2038 on UNIX, and 1970 2038 on Windows None of the built-in PHP date functions will work with dates outside this range Needless to say, this is a Bad Thing You can work around this problem with the Active Data Objects Data Base (ADOdb) Date Library, a free PHP library that uses 64-bit floating-point numbers instead of 32-bit integers to represent timestamps, thus significantly increasing the valid range This library is freely available from http://phplenscom/ phpeverywhere/adodb_date_library, and it provides 64-bit substitutes for PHP s native date and time functions, enabling you to work with dates from 100 AD to 3000 AD and later As the previous listing illustrates, input and output parameters for the ADOdb functions are identical to those of the native PHP ones, enabling them to serve as drop-in replacements
CHAPTER
Working with Arrays
IN THIS CHAPTER:
41 Printing Arrays 42 Processing Arrays 43 Processing Nested Arrays 44 Counting the Number of Elements in an Array 45 Converting Strings to Arrays 46 Swapping Array Keys and Values 47 Adding and Removing Array Elements 48 Extracting Contiguous Segments of an Array 49 Removing Duplicate Array Elements 410 Re-indexing Arrays 411 Randomizing Arrays 412 Reversing Arrays 413 Searching Arrays 414 Searching Nested Arrays 415 Filtering Array Elements 416 Sorting Arrays 417 Sorting Multidimensional Arrays 418 Sorting Arrays Using a Custom Sort Function 419 Sorting Nested Arrays 420 Merging Arrays 421 Comparing Arrays
PHP Programming Solutions
HP s array manipulation API was redesigned in PHP 4x to simplify common array manipulation tasks New objects designed specifically for array iteration were introduced in PHP 5x as part of the Standard PHP Library (SPL) to make array manipulation even more extensible and customizable The result is a sophisticated toolkit that enables you to easily perform complex tasks, including recursively traversing and searching a series of nested arrays, sorting arrays by more than one key, filtering array elements by user-defined criteria, and swapping array keys and values In this chapter, I ll discuss all of these tasks, and many more so keep reading!
41 Printing Arrays
Problem
You want to print the contents of an array
Solution
Use PHP s print_r() or var_dump() functions:
< php // define array $data = array( "UK" => array( "longname" => "United Kingdom", "currency" => "GBP"), "US" => array( "longname" => "United States of America", "currency" => "USD"), "IN" => array( "longname" => "India", "currency" => "INR")); // print array contents print_r($data); var_dump($data); >
Comments
The print_r() and var_dump() functions are great ways to X-ray the contents of an array variable, and print a hierarchical listing of its internals The previous listing
4: Working with Arrays
demonstrates them both in action Note that var_dump() produces more verbose output (including information on data types and lengths) than print_r()
42 Processing Arrays
Problem
You want to iteratively process the elements in an array
Solution
Use a foreach() loop and appropriate temporary variables, depending on whether the array has numeric indices or string keys:
< php // define indexed array $idxArr = array("John", "Joe", "Harry", "Sally", "Mona"); // process and print array elements one by one // result: "John | Joe | Harry | Sally | Mona | " foreach ($idxArr as $i) { print "$i | "; } > < php // define associative array $assocArr = array("UK" => "London", "US" => "Washington", "FR" => "Paris", "IN" => "Delhi"); // process and print array elements one by one // result: "UK: London US: Washington FR: Paris IN: Delhi " foreach ($assocArr as $key=>$value) { print "$key: $value"; print "<br />"; } >
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