Ppt pHp

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Yikes
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Introduction to PHP
PHP is a server-side scripting language designed
specifically for the Web. Within an HTML page,
you can embed PHP code that will be executed each
time the page is visited. Your PHP code is
interpreted at the Web server and generates HTML
or other output that the visitor will see (PHP
and MySQL Web Development, Luke Welling and
Laura Thomson, SAMS)
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PHP History

• 1994 Created by Rasmis Lesdorf, software
  engineer (part of Apache Team)
• 1995 Called Personal Home Page Tool, then
  released as version 2 with name PHP/FI (Form
  Interpreter, to analyze SQL queries)
• Half 1997 used by 50,000 web sites
• October 1998 used by 100,000 websites
• End 1999 used by 1,000,000 websites

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Alternatives to PHP

• Practical extraction and Report Language (Perl)
• Active Server Pages (ASP)
• Java server pages (JSP)
• Ruby

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How PHP generates HTML/JS Web pages
1 Client from browser send HTTP request (with
POST/GET variables) 2 Apache recognizes that a
PHP script is requested and sends the request to
PHP module 3 PHP interpreter executes PHP
script, collects script output and sends it
back 4 Apache replies to client using the PHP
script output as HTML output
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Hello World! (web oriented)
lthtmlgt ltheadgt lttitlegtMy personal Hello World!
PHP scriptlt/titlegt lt/headgt ltbodygt lt? echo Hello
World! ?gt lt/htmlgt
PHP tag, allow to insert PHP code. Interpretation
by PHP module will substitute the code with code
output
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PHP echo and print statements-

• echo and print are more or less the same. They
  are both used to output data to the screen.
• The differences are small echo has no return
  value while print has a return value of 1 so it
  can be used in expressions. echo can take
  multiple parameters (although such usage is rare)
  while print can take one argument. echo is
  marginally faster than print.

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PHP Operators
Operators are used to operate on values. There
are four classifications of operators gt
Arithmetic gt Assignment gt Comparison
gt Logical
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PHP Operators
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PHP Conditional Statements

• gt if statement - use this statement to execute
  some code only if a specified condition is true
• gt if...else statement - use this statement to
  execute some code if a condition is true and
  another code if the condition is false
• gt if...elseif....else statement - use this
  statement to select one of several blocks of code
  to be executed
• gt switch statement - use this statement to select
  one of many blocks of code to be executed

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• Use the if....else statement to execute some code
  if a condition is true and another code if a
  condition is false.

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Arrays (I)

• Groups a set of variables, every element stored
  into an array as an associated key (index to
  retrieve the element)
• books array( 0gtphp manual,1gtperl
  manual,2gtC manual)
• books array( 0gtphp manual,perl manual,C
  manual)
• books array (php manual,perl manual,C
  manual)
• echo books2 output C manual
• Arrays with PHP are associative
• books array( php manualgt1,perl
  manualgt1,C manualgt1) // HASH
• echo booksperl manual output 1
• bookslisp manual 1 // Add a new element

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Arrays (II)

• Working on an arrays
• books array( php manual,perl manual,C
  manual)
• Common loop
• for (i0 i lt count(books) i)
• print (i1).-st book of my library
  booksi
• each
• books array( php manualgt1,perl
  manualgt2,C manualgt3)
• while (item each( books )) // Retrieve items
  one by one
• print itemvalue.-st book of my library
  .itemkey
• // each retrieve an array of two elements with
  key and value of current element
• each and list
• while ( list(value,key) each( books ))
• print value-st book of my library key
• // list collect the two element retrieved by
  each and store them in two different // variables

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Arrays (III)

• Multidimensional arrays
• books array( array(titlegtphp
  manual,editorgtX,authorgtA),
• array(titlegtperl manual,editorgtY,
  authorgtB),
• array(titlegtC manual,editorgtZ,autho
  rgtC))
• Common loop
• for (i0 i lt count(books) i )
• print i-st book, title .booksititle
  . author .booksiauthor.
• editor .booksieditor
• // Add .\n for text new page or .ltBRgt for
  HTML new page
• Use list and each
• for (i0 i lt count(books) i)
• print i-st book is
• while ( list(key,value) each( booksi
  ))
• print key value
• print ltBRgt // or \n

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Object Oriented PHP

• Encapsulation
• Polymorphism
• Inheritance
• Multiple Inheritance actually unsupported

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Encapsulation
val4 ((month1)3)/5 val5
year/4 val6 year/100 val7
year/400 val8 day(month2)val4val3
val5-val6val72 val9 val8/7 val0
val8-(val97) return val0 //
Main instance new dayOfWeek(_GETday,_
GETweek,_GET month) print You
born on .instance-gtcalculate().\n ?gt
lt? class dayOfWeek var day,month,year
function dayOfWeek(day,month,year)
this-gtday day this-gtmonth month
this-gtyear year function
calculate() if (this-gtmonth1)
monthTmp13 yearTmp this-gtyear - 1
if (this-gtmonth 2) monthTmp
14 yearTmp this-gtyear - 1
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Inheritance
Allow the creation of a hierarchy of classes
Class reuseMe function reuseMe()...
function doTask1()... function
doTask2()... function doTask3()...
Class extends reuseMe function example()
... // local initializations // call
super constructor reuseMereuseMe()
function doTask4()... function
doTask5()... function doTask6()...
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Polymorphism
A member function can override superclass
implementation. Allow each subclass to
reimplement a common interfaces.
class reuseMe function reuseMe()...
function doTask1()... function
doTask2()... function doTask3()...
Class extends reuseMe function example()
... // local initializations // call
super constructor reuseMereuseMe()
function doTask4()... function
doTask5()... function doTask6()...
function doTask3()...
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Multiple Inheritance not actually supported by
PHP
class reuseMe1 function reuseMe1()...
function doTask1()... function
doTask2()... function doTask3()...
class reuseMe2 function reuseMe2()...
function doTask3()... function
doTask4()... function doTask5()...
class extends reuseMe1,reuseMe2 ...
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