Variables, Operators, Arrays, Loops (lecture 2).pptx

Sqa

1. Web Development(PHP) Lecture 2 Variables, Operators, Arrays, Loops

2. Basic Syntax (Single Line Comments) <? php //This is Single Line Comment echo "<h1> Hello </h1>"; print "Class"; ?>

3. Basic Syntax ( MultiLine Comments) <? php /*This is Other Comment This is multiline comment This is last line of comment*/ echo "<h1> Hello </h1>"; print "Class"; ?>

4. Operators Concatenation Operator (.) Arithmetic Operators(+,-,/,*,%) Assignment Operators(=) Increment/Decrement Operators(++,--) Comparison Operator(==,===,<,>,<=,>=)

5. Plus Operator <? php $x=5; $y=6; $z=$x+$y; echo " The Result =" .$z; ?>

6. Minus Operator <? php $x=5; $y=6; $z=$ x-$y ; echo " The Result =" .$z; ?>

7. Multiplication Operator <? php $x=5; $y=6; $z=$ x*$y ; echo " The Result =" .$z; ?>

8. Division Operator <? php $x=5; $y=6; $z=$ x/$y ; echo " The Result =" .$z; ?>

9. Modulus Operator <? php $x=5; $y=6; $z=$ x%$ y; echo " The Result =" .$z ; ?>

10. Increment/Decrement Operators <? php $x=100; $y=15; $x++; echo "< br /> X Incremented Values = ".$x; $y--; echo "< br /> X Decremented Values = ".$y; ?>

11. Comparison Operators (==,===) <? php $x=5; $y="Hello"; $z="hello"; if ($z===$y) { echo "Both Variables are Equals"; }else { echo "Both Variables are Not Equals"; } ?>

12. Array in PHP Array is the linear collection or group of multiple amount of data In php there are only dynamic array not static Array define in php : $ variablename =array();

13. Array in PHP <? php $ myarr =array(); $ myarr [0]=1; $ myarr ['hi']="HELLO"; echo $ myarr [0]."< br />"; echo $ myarr ['hi']; ?>

14. Array in PHP <? php $ myarr =array(0=>1,'hi'=>"HELLO "); echo $ myarr [0]."< br />"; echo $ myarr ['hi']; ?>

15. Array in PHP <? php $ myarr =array(); $ myarr [0]=1; $ myarr []="HELLO"; $ myarr []=50; echo "<pre>"; print_r ($ myarr ); echo "</pre >"; <? php $ myarr =array(); $ myarr [0]=array(12,13); //It means it is two dimentional array //Like //$ myarr [0][0]=12; //$ myarr [0][1]=13; echo "<pre>"; print_r ($ myarr ); echo "</pre>";

16. Loops in PHP For Loop While loop Do while loop Foreach loop

17. FOR Loop in PHP Example:1 <? php for ($i=0; $i <=9 ; $i++) { echo "Square of ".$i." = ".($i*$i)."<br>"; } ?> Example:2 <? php $ farray =array(1,2,3,4,5,6,7,8,9,0 ); for ($ i =0; $ i <=9 ; $ i ++) { echo $ farray [$ i ]."< br >"; } ?>

18. While/do While Loop <? php $ farray =array(1,2,3,4,5,6,7,8,9,0); $result=count($ farray ); $ i =0; while ($ i <= $result) { echo $ farray [$ i ]." , "; $ i ++; } ?> <? php $ farray =array(1,2,3,4,5,6,7,8,9,0); $result=count($ farray ); $ i =0; do { echo $ farray [$ i ]." , "; $ i ++; }while ($ i > $result) ?>

19. foreach (Loop) <? php $ farray =array("num1"=>1,"num2"=>2,3,4,5); $result=count($ farray ); $ i =0; foreach ($ farray as $a) { echo $a." "; } ?> <? php $ farray =array("num1"=>1,"num2"=>2,3,4,5); $result=count($ farray ); $ i =0; foreach ($ farray as $a=>$b) { echo $a." => ".$b."</ br >"; } ?>

20. Let’s Practice