Special Documentation about Basic PHP

1-basic-intro-of-php.txt

/*==================================
Basic Introduction of PHP
====================================*/

** PHP - Hypertext Preprocessor 
** Server side scripting language
** First Released Date : 1994
** Created By: Rasmus Lerdorf
** Most CMS used PHP - 
	* WordPress
	* Joomla
	* Drupal
** Most popular website used PHP in there website -
	* Facebook
	* Yahoo
	* Wikipedia
	* Flicker 

2-php-variable.php

<?php

/*====================================*
 Rules for PHP variables:
======================================*/

	/*
	=> A variable starts with the $ sign, followed by the name of the variable
	=> A variable name must start with a letter or the underscore character
	=> A variable name cannot start with a number
	=> A variable name can only contain alpha-numeric characters and underscores (A-z, 0-9, and _ )
	=> Variable names are case-sensitive ($age and $AGE are two different variables)
	*/
	

	//PHP variable

	$myfriend = 'my friend name is jahed hossain';
	$br = '<br>';

	echo $myfriend . $br;

?>

3-php-operator-list.txt

/*==================================
 Operator
====================================*/

/*
 1. Arithmetic Operator
 2. Assignment Operator
 3. Logical Operator
 4. Comparison Operator
 5. Array Operator
 6. Increment/decrement Operator
 7. String Operator
*/

4-php-arithmetical-operator.php

<?php

/*
 =======================
  1. Arithmetic Operator 
 =======================
 1.1 - Plus : +
 1.2 - Mynus : -
 1.3 - Into : *
 1.4 - Devided : /
 1.5 - Modulas : %
*/

	$father = 60;
	$son = 25;

	$plus = $father + $son; //Plus
	$mynus = $father - $son; //Mynus
	$into = $father * $son; //Into
	$devided = $father / $son; //Devided
	$modulas = $father % $son; //Modulas
	
	echo $plus . $br;
	echo $mynus . $br;
	echo $into . $br;
	echo $devided . $br;
	echo $modulas . $br;

?>

5-php-assignment-operator.php

<?php

/*
 =======================
  2. Assignment Operator  
 =======================
 2.1 - Plus-equal : +=
 2.2 - Mynus-equal : -=
 2.3 - Into-equal : *=
 2.4 - Devided-equal : /=
 2.5 - Modulas-equal : %=
*/

	$age = 20;
	$age = $age += 5; //Plus-equal
	//$age = $age -= 5; //Mynus-equal
	//$age = $age *= 5; //Into-equal
	//$age = $age /= 5; //Devided-equal
	//$age = $age %= 5; //Modulas-equal

	echo $age . $br;
  
?>

6-php-logical-operator.php

<?php

/*
 =======================
  3. Logical Operator  
 =======================
 3.1 - (or) - || 
 3.2 -  (and) - && 
 3.3 - (not) - ! 
*/

	$username = 'humayunahmed8';
	$password = 'ha154248';

	// (and)  
	if($username == 'humayunahmed8' && $password == 'ha154248'){
		echo 'login success' . $br;
	}else{
		echo 'login failed' . $br;
	}
	
	//(or)
	/*
	if($username == 'humayunahmed8d' || $password == 'ha154248'){
		echo 'login success';
	}else{
		echo 'login failed';
	}
	*/
  
?>

7-php-comparison-operator.php

<?php

/*
 =======================
  4. Comparison Operator  
 =======================
 4.1 - (equal) - == 
 4.2 -  (not equal) - != 
 4.3 - (not equal) - <> 
 4.4 - (greater than) - >
 4.5 - (greater than or equal to) - >=
 4.6 - (less than) - <
 4.7 - (less than or equal to) - <=
*/
	$humayun = 20;
	$jahed = 18;
	
	if($humayun > $jahed){
		echo 'true' . $br;
	}else{
		echo 'false' . $br;
	}
	
	$humayra = 17;
	
	if($humayra >= 18){
		echo 'Ready for marriage' . $br;
	}else{
		echo 'not ready for marriage' . $br;
	}

?>

8-php-array-operator.php

<?php

/*
 =======================
  5. Array Operator 
 =======================
 5.1 - Indexed Array
 5.2 - Associative Array
 5.3 - Multidimensional Array
*/

 // 5.1 - Indexed Array
 
 $father = array(1=>'humayun','foysal','fariya');

 //print_r($father);
 
 echo $father[1] . $br;
 
 // 5.2 - Associative Array
 
 $mother = array('humayun'=>21,'foysal'=>18,'fariya'=>10);
 
 //print_r($mother);
 
 echo $mother['foysal'] . $br;

 // 5.3 - Multidimensional Array
 
 $humayun = array(
	'humayra' => array(
		'class' => 12,
		'group' => 'Business Studies',
		'hobby' => 'Reading',
	 ),
	'abrar' => array(
		'class' => 10,
		'group' => 'Science',
		'hobby' => 'Sleeping',
	 ) ,
	'jahanara' => array(
		'class' => 9,
		'group' => 'Humanities',
		'hobby' => 'Singing',
	 ) 
 );

 //print_r($humayun);
 
 //echo $humayun['humayra']['hobby'];
 //echo $humayun['abrar']['group'];
 //echo $humayun['jahanara']['class'];
 
 echo $humayun['humayra']['hobby'].$br.$humayun['abrar']['group'].$br.$humayun['jahanara']['class'] . $br;

?>

php-loop.php

<?php

/*
 ==============
  Loop
 ==============
 1. for loop
 2. while loop
 3. foreach loop 
*/

 //1. for loop
 //for(initialization,condition,increment/decrement);
 
 for($i=100;$i>=1;$i--){
	echo $i . $br; 
 }
 
 //1++
  for($b=1;$b<=100;$b++){
	echo $b . $br;
 }
 
 //2+2=4+2=6+2=8
  for($b=2;$b<=100;$b+=2){ // assign 
	echo $b . $br;
 }
 
 //1+2=3+2=5+2=7
  for($b=1;$b<=100;$b+=2){ // assign 
	echo $b . $br;
 }
 
 //2. while loop

 $n=1;
 
 while($n<=100){
	 echo $n . $br;
	 $n++;
 }
 
 //3. foreach loop 
 
 
 $rahman = array('ramim'=>20,'nadim'=>25,'hridoy'=>30,'sakib'=>28);
 
 foreach($rahman as $child=>$year){
	 //echo $child . $year . $br ;
	 echo $child . ' age is' . $year . $br;
 }
 
 ?>