Title: Learn PHP With Myassignmenthelp.net
1- PHP
- (Hypertext Preprocessor)
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2Overview of PHP
- PHP stands for Hypertext Preprocessor
- Created by Rasmus Lerdorf in 1995
- It is an open source software
- It is server-side scripting language, like ASP
and executed on the server - More functionality added (OOP features), database
support, protocols and APIs - A language that combines elements of Perl, C, and
Java - It is free to use and download
- PHP files can contain text, HTML tags and scripts
and file extension of ".php" or ".phtml - PHP files are returned to the browser as plain
HTML
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3PHP Syntax
- PHP code is executed on the server, and the plain
HTML result is sent to the browser. - Syntax It is starts with lt?php and ends with
?gt. A PHP scripting block can be placed anywhere
in the document. - Comments in PHP
- use // to make a single-line comment or / and /
to make a large comment block.
lt?php ?gt
lthtmlgtltbodygtlt?php//This is a comment/ This is a comment block / ?gtlt/bodygtlt/htmlgt
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4PHP Language Basics
- Constants, Data Types and Variables
- Constants define a string or numeric value
- Constants do not begin with a dollar sign
- Examples
- define(COMPANY, Acme Enterprises )
- define(YELLOW, FFFF00)
- define(PI, 3.14)
- define(NL, ltbrgt\n)
- Data types
- Integers, doubles and strings
- isValid true // Boolean
- 25 // Integer
- 3.14 // Double
- Four // String
- Total value // Another string
5Variables
- It is used to store information.
- It is used for storing information, like text
strings, numbers or arrays. - All variables in PHP start with a sign symbol.
- The declaring a variable
- String variable
- used to store and manipulate text
- script assigns the text "Hello" to a string
variable called text
var_name value
lt?phptextWelcome"echo text?gt
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6Operators
- Arithmetic Operators
- (Addition), - (Subtraction),
(Multiplication), / (Division), (Modulus
), (Increment), -- (Decrement) - Assignment Operators
- , , -, , /, .,
- Comparison Operators
- , !, ltgt, gt, lt, gt, lt
- Logical Operators
- (and), (or), ! (not)
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7Conditional Statements
- if Statement
- execute some code only if a specified condition
is true - if...else Statement
- execute some code if a condition is true and
another code if the condition is false - if...elseif....else Statement
- use this statement to select one of several
blocks of code to be executed
if (condition) code to be executed if condition is true
if (condition) code to be executed if condition is trueelse code to be executed if condition is false
if (condition) code to be executed if condition is true elseif (condition) code to be executed if condition is true else code to be executed if condition is false
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8Switch Statement
- Conditional statements are used to perform
different actions based on different conditions. - Syntax
switch (n)case label1 code to be executed if nlabel1 breakcase label2 code to be executed if nlabel2 breakdefault code to be executed if n is different from both label1 and label2
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9Loops
- while Loop
- executes a block of code while a condition is
true. -
- do...while Statement
- always execute the block of code once, it will
then check the condition, and repeat the loop
while the condition is true.
while (condition) code to be executed
do code to be executed while (condition)
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10Loops (cont)
- for Loop
- The for loop is used when you know in advance how
many times the script should run. - foreach Loop
- The foreach loop is used to loop through arrays.
for (init condition increment) code to be executed
foreach (array as value) code to be executed
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11Form
- One of the main features in PHP is the ability to
take user input and generate subsequent pages on
the input. In this page, we will introduce the
mechanism by which data is passes in PHP. - Let's consider the following two files
- query.php
- result.php
ltform actionresult.php typepostgt ltinput typetext nameemployeegt ltinput typesubmit valueSubmitgt lt/formgt
lt?php employee_name_POST"employee" print employee_name ?gt
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12_GET Function
- The built-in _GET function is used to collect
values in a form with method"get". - When using method"get" in HTML forms, all
variable names and values are displayed in the
URL. - Information sent from a form with the GET method
is visible to everyone and has limits on the
amount of information to send. - When the user clicks the "Submit" button, the URL
sent to the server could look something like
this
ltform actionform.php" method"get"gtName ltinput type"text" name"name" /gtAge ltinput type"text" name"age" /gtltinput type"submit" /gtlt/formgt
http//www.xyz.com/form.php?nameDennyage20
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13_POST Function
- The built-in _POST function is used to collect
values from a form sent with method"post". - Information sent from a form with the POST method
is invisible to others and has no limits on the
amount of information to send and the variables
are not displayed in the URL and 8 Mb max size
for the POST method, by default also can be
changed by setting the post_max_size in the
php.ini file. - Information sent from a form with the POST method
is invisible to others and has no limits on the
amount of information to send.
ltform actionform.php" method"post"gtName ltinput type"text" name"name" /gtAge ltinput type"text" name"age" /gtltinput type"submit" /gtlt/formgt
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14 Thank You
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