PHP

“ PHP is an HTML-embedded scripting language. Much of its syntax is borrowed from C, Java and Perl with a couple of unique PHP-specific features thrown in. The goal of the language is to allow web developers to write dynamically generated pages quickly."

Variables Declaration:

$variable_name = value;

Example :

<?php

$hello = "Hello World!";

$a_number = 4;

$anotherNumber = 8;

?>

Naming Conventions or Rules for Variable Declaration :

There are a few rules that you need to follow when choosing a name for your PHP variables.

• PHP variables must start with a letter or underscore "_".

• PHP variables may only be comprised of alpha-numeric characters and underscores. a-z, A-Z, 0-9, or _ .

• Variables with more than one word should be separated with underscores. $my_variable

• Variables with more than one word can also be distinguished with capitalization. $myVariable

Control Statements :

If

If…else

Nested if

Looping Statements:

Swith

For

While

Do..while

Operators :

Assignment

Arithmetic

String

String Handling :

Ø  String creation

Ø  String concatination

Ø  String Position(Strpos)

Ø  String Lowercase to Uppercase(strtoupper()) :

Ø  String Uppercase to Lowercase(strtolower());

Ø  String First letter capitalization: ucwords();

Ø  String breaking or split : explode(‘spl-char/symbol’, $variable);

Ø  Spilt String can be combined by using : implode(‘spl-char/symbol’,$variable);

String creation :

$myString=”hello world”;

Echo $myString;

String concate :

Echo $myString.$myString;

String Position or searching/finding  a string positions:

$numberedString = "1234567890"; // 10 numbers from 1 to 0

$fivePos = strpos($numberedString, "5");

 echo "The position of 5 in our string was $fivePos";

Lowercase to Uppercase :

$originalString = "String Capitalization 1234";

$upperCase = strtoupper($originalString);

echo "Old string - $originalString <br />";

 echo "New String - $upperCase";

Uppercase to Lowercase:

$originalString = "String Capitalization 1234";

$lowerCase = strtolower($originalString);

echo "Old string - $originalString <br />";

 echo "New String - $lowerCase";

First letter Captalization:

$titleString = "a title that could use some hELP";

$ucTitleString = ucwords($titleString);

echo "Old title - $titleString <br />";

echo "New title - $ucTitleString";

String Spilt :

$rawPhoneNumber = "800-555-5555";

$phoneChunks = explode("-", $rawPhoneNumber);

echo "Raw Phone Number = $rawPhoneNumber <br />";

echo "First chunk = $phoneChunks[0]<br />";

echo "Second chunk = $phoneChunks[1]<br />";

 echo "Third Chunk chunk = $phoneChunks[2]";

Functions :

Build-in Functions:

• Echo
  
•  Include(“filename.php”);
•  Date
•  Require(“filename.php”);

User  can define Functions:

Function functionname() {   }