Learning PHP and MySQL

Wednesday, July 19, 2006

Example 03-05 Using comments to make your code easier to read

<html>
<head>
<title>Hello  World</title>
</head>
<body>
<?php

//  A  single  line  comment  could  say  that  we  are  going  to
//  print  hello  world.

/*  This  is  how  to  do  a
multi-line  comment  and  could  be  used to  comment  out  a  block of  code  */

echo("Hello  world!<br  />");
print('Goodbye.<br  />');

?>
</body>
</html>

Posted by krautgrrl on 07/19 at 03:37 PM
Chapter 3 Code • (1) Comments • (368) Trackbacks • Permalink

Example 03-07 The default handling of variable scope

<?php

//  define  a  function function  birthday(){
//  Set  age  to  1
$age  =  1;
}

//  Set  age  to  30
$age  =  30;

//  Call  the  function
birthday();

//  Display  the  age echo  $age;

?>

Displays:

30

Posted by krautgrrl on 07/19 at 03:38 PM
Chapter 3 Code • (5) Comments • (788) Trackbacks • Permalink

Example 03-08 Using a global variable changes the result

<?php

//  Define  a  function function  birthday(){
//  Define  age  as  a  global  variable
global  $age;

//  Add  one  to  the  age  value


//  set  age  to  30
$age  =  30;

//  Call  the  function birthday();

//  Display  the  age echo  $age;

?>

Displays:

31

Posted by krautgrrl on 07/19 at 03:40 PM
Chapter 3 Code • (3) Comments • (97) Trackbacks • Permalink

Example 03-09 A static variable remembering its last value

<?php
//  Define  the  function function  birthday(){
//  Define  age  as  a  static  variable static  $age  =  0;

//  Add  one  to  the  age  value
$age  =  $age  +  1;

//  Print  the  static  age  variable
echo  "Birthday  number  $age<br  />";
}

//  Set  age  to  30
$age  =  30;

//  Call  the  function  twice birthday();
birthday();

//  Display  the  age
echo  "Age:  $age<br  />";

?>

Displays:

Birthday number 1
Birthday number 2
Age:  30

Posted by krautgrrl on 07/19 at 03:41 PM
Chapter 3 Code • (4) Comments • (654) Trackbacks • Permalink

Example 03-10 PHP_SELF being used with a file called test.php

<?php
echo  $_SERVER["PHP_SELF"];
?>

Outputs:

/test.php

Posted by krautgrrl on 07/19 at 03:42 PM
Chapter 3 Code • (4) Comments • (503) Trackbacks • Permalink

Example 03-11 Working with strings

<?php
$my_string  =  "Margaritaville  -  Suntan  Oil  Application!";
echo  "Margaritaville  -  Suntan  Oil  Application!";
?>

Posted by krautgrrl on 07/19 at 03:43 PM
Chapter 3 Code • (4) Comments • (1002) Trackbacks • Permalink

Example 03-12 Using a variable in a string definition

<?php
$my_string  =  "Margaritaville  -  Suntan  Oil  Application!";
echo  "Time  for  $my_string";
?>

Posted by krautgrrl on 07/19 at 03:43 PM
Chapter 3 Code • (0) Comments • (3647) Trackbacks • Permalink

Example 03-13 Single quotes used in a string assignment

<?php
$my_string  =  'Margaritaville  -  Suntan  Oil  Application!';
echo  $my_string;
?>

Posted by krautgrrl on 07/19 at 03:44 PM
Chapter 3 Code • (26) Comments • (150) Trackbacks • Permalink

Example 03-14 Various special characters in string assignments

<?php
$newline  =  "A  newline  is  \n";
$return  =  "A  carriage  return  is  \r";
$tab  =  "A  tab  is  \t";
$dollar  =  "A  dollar  sign  is  \$";
$doublequote  =  "A  double-quote  is  \"";
?>

Posted by krautgrrl on 07/19 at 03:45 PM
Chapter 3 Code • (3) Comments • (278) Trackbacks • Permalink

Example 03-15 Using echo with special characters

<?php
//  This  won't  work  because  of  the  quotes  around  specialH2!
echo  "<h2  class="specialH2">Margaritaville!</h2>";
?>

Posted by krautgrrl on 07/19 at 03:45 PM
Chapter 3 Code • (2) Comments • (2037) Trackbacks • Permalink

Example 03-16 Correct escaping of special characters

<?php
//  OK  because  we  used  single  quotes
echo  "<h2  class=\"specialH2\">Margaritaville!</h2>";
echo  '<h2  class="specialH2">Margaritaville!</h2>';
?>

Posted by krautgrrl on 07/19 at 03:47 PM
Chapter 3 Code • (27) Comments • (163) Trackbacks • Permalink

Example 03-17 Using strcmp to compare two stings

<?php

$name1  =  "Bill";
$name2  =  "BILL";

$result  =  strcasecmp($name1,  $name2);

if  (!$result){
echo  "They  match.";
}

?>

Returns:

They match.

Posted by krautgrrl on 07/19 at 03:49 PM
Chapter 3 Code • (0) Comments • (2) Trackbacks • Permalink

Example 03-18 Concatenating strings together

<?php
$my_string  =  "Hello  Max.  My  name  is:  ";
$newline  =  "<br  />";
echo  $my_string  .  "Paula"  .  $newline;
echo  "Hi,  I'm  Max.  Who  are  you?  "  .  $my_string  .  $newline;
echo  "Hi,  I'm  Max.  Who  are  you?  "  .  $my_string  .  "Paula";
//The  last  line  is  the  same  as  echo  "Hi,  I’m  max.  Who  are  you?  $my_string  Paula";
?>

Posted by krautgrrl on 07/19 at 03:55 PM
Chapter 3 Code • (27) Comments • (4) Trackbacks • Permalink

Example 03-19 Combining a string and a number

<?php
$str  =  "This  is  an  example  of  ".  3  ."  in  the  middle  of  a  string.";
echo  $str;
?>

Displays:

This is an example of 3 in the middle of a string.

Posted by krautgrrl on 07/19 at 03:55 PM
Chapter 3 Code • (0) Comments • (2) Trackbacks • Permalink

Example 03-20 Using a constant in your program

<?php
define("HELLO",  "Hello  world!");
echo  HELLO;  //  outputs  "Hello  world."
?>

Outputs:

Hello world!

Posted by krautgrrl on 07/19 at 03:56 PM
Chapter 3 Code • (0) Comments • (45) Trackbacks • Permalink
Page 1 of 2 pages  1 2 >

Statistics

This page has been viewed 375212 times
Page rendered in 0.2414 seconds
Total Entries: 224
Total Comments: 16
Total Trackbacks: 307338
Most Recent Entry: 09/27/2006 12:39 pm
Most Recent Comment on: 10/26/2007 10:00 am
Total Members: 2
Total Logged in members: 0
Total guests: 8
Total anonymous users: 0
Most Recent Visitor on: 02/10/2012 09:43 am
The most visitors ever was 1103 on 11/20/2007 12:50 pm

Referrers

Powered by ExpressionEngine