ghostscriptsharp pdf to image c#: Create a pdf form in word control Library utility azure asp.net windows visual studio 05-welling-php-mysql-web16-part61

127

Comparing String Functions and Regular Expression Functions

$toaddress = ‘fulfillment@example.com’;

else if (eregi(‘bill|account’, $feedback))

$toaddress = ‘accounts@example.com’;

if (eregi(‘bigcustomer\.com’, $email))

$toaddress = ‘bob@example.com’;

Replacing Substrings with Regular Expressions

You can also use regular expressions to find and replace substrings in the same way as

you used

str_replace()

.The two functions available for this task are

ereg_replace()

and

eregi_replace()

.The function

ereg_replace()

has the following prototype:

string ereg_replace(string pattern, string replacement, string search);

This function searches for the regular expression

pattern

in the

string and

replaces it with the string

replacement

The function

eregi_replace()

is identical but,again,is not case sensitive.

Splitting Strings with Regular Expressions

Another useful regular expression function is

split()

,which has the following proto-

type:

array split(string pattern, string search[, int max]);

This function splits the string

into substrings on the regular expression

pattern

and returns the substrings in an array.The

max

integer limits the number of items that

can go into the array.

This function can be useful for splitting up email addresses,domain names,or dates.

For example,

$address = ‘username@example.com’;

$arr = split (‘\.|@’, $address);

while (list($key, $value) = each ($arr))

echo ‘<br />’.$value;

This example splits the hostname into its five components and prints each on a separate

line.

Comparing String Functions and Regular

Expression Functions

In general, the regular expression functions run less efficiently than the string functions

with similar functionality.If your task is simple enough to use a string expression,do so.

This may not be true for tasks that can be performed with a single regular expression

but multiple string functions.

Create a pdf form in word - C# PDF Field Edit Library: insert, delete, update pdf form field in C#.net, ASP.NET, MVC, Ajax, WPF

Online C# Tutorial to Insert, Delete and Update Fields in PDF Document

pdf save form data; add fields to pdf form

Create a pdf form in word - VB.NET PDF Field Edit library: insert, delete, update pdf form field in vb.net, ASP.NET, MVC, Ajax, WPF

How to Insert, Delete and Update Fields in PDF Document with VB.NET Demo Code

change font in pdf fillable form; adding text fields to pdf acrobat

128

Chapter 4 String Manipulation and Regular Expressions

Further Reading

PHP has many string functions.We covered the more useful ones in this chapter,but if

you have a particular need (such as translating characters into Cyrillic),check the PHP

manual online to see whether PHP has the function for you.

The amount of material available on regular expressions is enormous.You can start

with the

man

page for

regexp

if you are using Unix,and you can also find some terrific

articles at devshed.com and phpbuilder.com.

At Zend’s website,you can look at a more complex and powerful email validation

function than the one we developed here.It is called

MailVal()

and is available at

http://www.zend.com/codex.php?id=88&single=1.

Regular expressions take a while to sink in;the more examples you look at and run,

the more confident you will be using them.

In the next chapter,we discuss several ways you can use PHP to save programming time

and effort and prevent redundancy by reusing pre-existing code.

VB.NET Create PDF from Word Library to convert docx, doc to PDF in

C#: Create PDF from PowerPoint; C#: Create PDF from Tiff; C#: Convert PDF to Word; C#: Convert PDF to C# Protect: Add Password to PDF; C# Form: extract value

create a pdf form; change font size in pdf form field

C# Create PDF from Word Library to convert docx, doc to PDF in C#.

Create PDF from Word. |. Home ›› XDoc.PDF ›› C# PDF: Create PDF from Word. Easy to create searchable and scanned PDF files from Word.

create a fillable pdf form; pdf add signature field

Reusing Code and Writing

Functions

HIS CHAPTER EXPLAINS HOW REUSING CODE

leads to more consistent,reliable,main-

tainable code,with less effort.We demonstrate techniques for modularizing and reusing

code,beginning with the simple use of

require()

and

include()

to use the same code

on more than one page.We explain why these includes are superior to server-side

includes.The example given here covers using include files to get a consistent look and

feel across your site.We also explain how you can write and call your own functions

using page and form generation functions as examples.

Key topics covered in this chapter include

Reusing code

Using

require()

and

include()

Introducing functions

Defining functions

Using parameters

Understanding scope

Returning values

Calling by reference versus calling by value

Implementing recursion

Reusing Code

One of the goals of software engineers is to reuse code in lieu of writing new code.

The reason for this is not that software engineers are a particularly lazy group.Reusing

existing code reduces costs,increases reliability,and improves consistency.Ideally, a new

project is created by combining existing reusable components, with a minimum of

development from scratch.

VB.NET PDF Form Data Read library: extract form data from PDF in

RasterEdge .NET PDF SDK is such one provide various of form field edit functions. Demo Code to Retrieve All Form Fields from a PDF File in VB.NET.

add attachment to pdf form; create a pdf form to fill out

C# PDF Form Data Read Library: extract form data from PDF in C#.

A best PDF document SDK library enable users abilities to read and extract PDF form data in Visual C#.NET WinForm and ASP.NET WebForm applications.

convert word doc to pdf with editable fields; change font size in fillable pdf form

130

Chapter 5 Reusing Code and Writing Functions

Cost

Over the useful life of a piece of software,significantly more time will be spent main-

taining,modifying,testing, and documenting it than was originally spent writing it.If

you are writing commercial code,you should attempt to limit the number of lines in use

within the organization.One of the most practical ways to achieve this goal is to reuse

code already in use instead of writing a slightly different version of the same code for a

new task.Less code means lower costs.If existing software meets the requirements of the

new project,acquire it.The cost of buying existing software is almost always less than the

cost of developing an equivalent product.Tread carefully,though,if existing software

almost meets your requirements. Modifying existing code can be more difficult than

writing new code.

Reliability

If a module of code is in use somewhere in your organization,it has presumably already

been thoroughly tested. Even if this module contains only a few lines,there is a possibili-

ty that,if you rewrite it,you will either overlook something that the original author

incorporated or something that was added to the original code after a defect was found

during testing.Existing,mature code is usually more reliable than fresh,“green”code.

Consistency

The external interfaces to your system,including both user interfaces and interfaces to

outside systems,should be consistent.Writing new code consistent with the way other

parts of the system function takes a will and a deliberate effort. If you are reusing code

that runs another part of the system,your functionality should automatically be

consistent.

On top of these advantages,reusing code is less work for you,as long as the original

code was modular and well written.While you work,try to recognize sections of your

code that you might be able to call on again in the future.

Using

require()

and

include()

PHP provides two very simple,yet very useful,statements to allow you to reuse any type

of code.Using a

require()

include()

statement,you can load a file into your PHP

script.The file can contain anything you would normally type in a script including PHP

statements,text,HTML tags,PHP functions,or PHP classes.

These statements work similarly to the server-side includes offered by many web

servers and

#include

statements in C or C++.

VB.NET PDF Convert to Word SDK: Convert PDF to Word library in vb.

webpage. Create high quality Word documents from both scanned PDF and searchable PDF files without losing formats in VB.NET. Support

adding a text field to a pdf; adding text to pdf form

VB.NET Create PDF from PowerPoint Library to convert pptx, ppt to

C#: Create PDF from PowerPoint; C#: Create PDF from Tiff; C#: Convert PDF to Word; C#: Convert PDF to C# Protect: Add Password to PDF; C# Form: extract value

add email button to pdf form; best way to create pdf forms

131

Using require() and include()

require()

The following code is stored in a file named

reusable.php

<?php

echo ‘Here is a very simple PHP statement.<br />’;

The following code is stored in a file named main.php:

<?php

echo ‘This is the main file.<br />’;

require( ‘reusable.php’ );

echo ‘The script will end now.<br />’;

If you load

reusable.php

,you probably won’t be surprised when the message

Here is a

very simple PHP statement.

appears in your browser.If you load

main.php

,something

a little more interesting happens.The output of this script is shown in Figure 5.1.

Figure 5.1 The output of

main.php

shows the result of the

require()

statement.

A file is needed to use a

require()

statement.In the preceding example,you used the

file named

reusable.php

.When you run the script, the

require()

statement

require( ‘reusable.php’ );

VB.NET Create PDF from Excel Library to convert xlsx, xls to PDF

C#: Create PDF from PowerPoint; C#: Create PDF from Tiff; C#: Convert PDF to Word; C#: Convert PDF to C# Protect: Add Password to PDF; C# Form: extract value

add image field to pdf form; add form fields to pdf

C# PDF Convert to Word SDK: Convert PDF to Word library in C#.net

and .docx. Create editable Word file online without email. Password protected PDF file can be printed to Word for mail merge. C# source

add form fields to pdf without acrobat; pdf editable fields

132

Chapter 5 Reusing Code and Writing Functions

is replaced by the contents of the requested file,and the script is then executed.This

means that when you load

main.php

,it runs as though the script were written as

follows:

<?php

echo ‘This is the main file.<br />’;

echo ‘Here is a very simple PHP statement.<br />’;

echo ‘The script will end now.<br />’;

When using

require()

,you need to note the different ways filename extensions and

PHP tags are handled.

Filename Extensions and require()

PHP does not look at the filename extension on the required file.This means that you

can name your file whatever you choose as long as you do not plan to call it directly.

When you use

require()

to load the file,it effectively becomes part of a PHP file and

is executed as such.

Normally,PHP statements would not be processed if they were in a file called,for

example,

page.html

.PHP is usually called upon to parse only files with defined exten-

sions such as

.php

.(This may be changed in your web server configuration file.)

However,if you load

page.html

via a

require()

statement,any PHP inside it will be

processed.Therefore,you can use any extension you prefer for include files,but sticking

to a sensible convention such as

.inc

.php

would be a good idea.

One issue to be aware of is that if files ending in

.inc

or some other nonstandard

extension are stored in the web document tree and users directly load them in the

browser,they will be able to see the code in plain text,including any passwords.It is

therefore important to either store included files outside the document tree or use the

standard extensions.

PHP Tags and require()

In the example,the reusable file (

reusable.php

) was written as follows:

<?php

echo ‘Here is a very simple PHP statement.<br />’;

The PHP code was placed within the file in PHP tags.You need to follow this conven-

tion if you want PHP code within a required file treated as PHP code. If you do not

open a PHP tag,your code will just be treated as text or HTML and will not be

executed.

VB.NET PDF Convert to Tiff SDK: Convert PDF to tiff images in vb.

Qualified Tiff files are exported with high resolution in VB.NET. Create multipage Tiff image files from PDF in VB.NET project. Support

convert pdf to editable form; pdf form save in reader

C# Create PDF from Excel Library to convert xlsx, xls to PDF in C#

C#.NET PDF SDK- Create PDF from Word in Visual C#. Online C#.NET Tutorial for Create PDF from Microsoft Office Excel Spreadsheet Using .NET XDoc.PDF Library.

pdf forms save; add fillable fields to pdf online

133

Using require() for Website Templates

Using

require()

for Website Templates

If your company’s web pages have a consistent look and feel,you can use PHP to add

the template and standard elements to pages using

require()

For example,the website of fictional company TLA Consulting has a number of

pages, all with the look and feel shown in Figure 5.2.When a new page is needed,the

developer can open an existing page, cut out the existing text from the middle of the

file,enter new text,and save the file under a new name.

Figure 5.2 TLA Consulting has a standard look and feel for

all its web pages.

Consider this scenario:The website has been around for a while,and the company now

has tens, hundreds,or maybe even thousands of pages all following a common style.A

decision is made to change part of the standard look;the change might be something

minor,such as adding an email address to the footer of each page or adding a single new

entry to the navigation menu. Do you want to make that minor change on tens, hun-

dreds,or even thousands of pages?

Directly reusing the sections of HTML common to all pages is a much better

approach than cutting and pasting on tens, hundreds,or even thousands of pages.The

source code for the home page (

home.html

) shown in Figure 5.2 is given in Listing 5.1.

Listing 5.1 home.html—The HTML That Produces TLA Consulting’s Home Page

<html>

<head>

<title>TLA Consulting Pty Ltd</title>

h1 {color:white; font-size:24pt; text-align:center;

font-family:arial,sans-serif}

134

Chapter 5 Reusing Code and Writing Functions

.menu {color:white; font-size:12pt; text-align:center;

font-family:arial,sans-serif; font-weight:bold}

td {background:black}

p {color:black; font-size:12pt; text-align:justify;

font-family:arial,sans-serif}

p.foot {color:white; font-size:9pt; text-align:center;

font-family:arial,sans-serif; font-weight:bold}

a:link,a:visited,a:active {color:white}

</style>

</head>

<body>

<td align=”left”><img src=”logo.gif” alt=”TLA logo” height=”70”

width=”70”></td>

<td>

<h1>TLA Consulting</h1>

</td>

<td align=”right”><img src=”logo.gif” alt=”TLA logo” height=”70”

width=”70”></td>

</tr>

</table>

<tr >

<span class=”menu”>Contact</span></td>

<span class=”menu”>Services</span></td>

</tr>

</table>

Listing 5.1 Continued

135

Using require() for Website Templates

<p>Welcome to the home of TLA Consulting.

Please take some time to get to know us.</p>

<p>We specialize in serving your business needs

and hope to hear from you soon.</p>

<tr>

<td>

<p class=”foot”>Please see our

<a href=”legal.php”>legal information page</a></p>

</td>

</tr>

</table>

</body>

</html>

You can see in Listing 5.1 that a number of distinct sections of code exist in this file.The

HTML head contains cascading style sheet (CSS) definitions used by the page.The sec-

tion labeled “page header”displays the company name and logo,“menu”creates the

page’s navigation bar,and “page content” is text unique to this page.Below that is the

page footer.You can usefully split this file and name the parts

header.inc

home.php

and

footer.inc

.Both

header.inc

and

footer.inc

contain code that will be reused on

other pages.

The file

home.php

is a replacement for

home.html

and contains the unique page con-

tent and two

require()

statements shown in Listing 5.2.

Listing 5.2 home.php—The PHP That Produces TLA’s Home Page

<?php

require(‘header.inc’);

<p>Welcome to the home of TLA Consulting.

Please take some time to get to know us.</p>

<p>We specialize in serving your business needs

and hope to hear from you soon.</p>

<?php

require(‘footer.inc’);

Listing 5.1 Continued

136

Chapter 5 Reusing Code and Writing Functions

The

require()

statements in

home.php

load

header.inc

and

footer.inc

As mentioned previously,the name given to these files does not affect how they are

processed when you call them via

require()

.A common,but entirely optional,conven-

tion is to call the partial files that will end up included in other files

something.inc

(here,

inc

stands for include).It is also common, and a good idea,to place your include

files in a directory that can be seen by your scripts but does not permit your include files

to be loaded individually via the web server—that is,outside the web document tree.

This setup prevents these files from being loaded individually, which would either (a)

probably produce some errors if the file extension is

.php

but contains only a partial

page or script,or (b) allow people to read your source code if you have used another

extension.

The file

header.inc

contains the CSS definitions that the page uses, the tables that

display the company name,and navigation menus,as shown in Listing 5.3.

Listing 5.3 header.inc—The Reusable Header for All TLA Web Pages

<html>

<head>

<title>TLA Consulting Pty Ltd</title>

h1 {color:white; font-size:24pt; text-align:center;

font-family:arial,sans-serif}

.menu {color:white; font-size:12pt; text-align:center;

font-family:arial,sans-serif; font-weight:bold}

td {background:black}

p {color:black; font-size:12pt; text-align:justify;

font-family:arial,sans-serif}

p.foot {color:white; font-size:9pt; text-align:center;

font-family:arial,sans-serif; font-weight:bold}

a:link,a:visited,a:active {color:white}

</style>

</head>

<body>

<td align=”left”><img src=”logo.gif” alt=”TLA logo” height=”70”

width=”70”></td>

<td>

<h1>TLA Consulting</h1>

</td>

<td align=”right”><img src=”logo.gif” alt=”TLA logo” height=”70”

width=”70”></td>

</tr>

</table>

Documents you may be interested

ghostscriptsharp pdf to image c# : Create a pdf form in word control Library utility azure asp.net windows visual studio 05-welling-php-mysql-web16-part61