Learn Basic PHP Programming

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Learn Basic PHP Programming

Contents

1) Hello World Program        

2) Sum Numbers Program        

3) Sum Variables Program        

4) Multiply Variables Program        

5) Divide Variables Program        

6) Count Numbers Program        

7) Display Array Values Program        

8) Edit Array Values Program        

9) Modular Program        

1) Hello World Program

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Flow Chart:

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Pseudo Code:

1. BEGIN
2. PRINT "Hello World"
3. END

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PHP Language sample code:

helloworld.php

<?php echo “Hello World”; ?>

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Live code at ideone.com: http://ideone.com/aozcyJ 
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PHP Language sample output:

2) Sum Numbers Program

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Flow Chart:

  

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Pseudo Code:

1. BEGIN
2. PRINT 1 + 2
3. END

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PHP Language sample code:

sumnumbers.php

<?php echo 1+2; ?>

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Live code at ideone.com: http://ideone.com/eQDifb

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PHP Language sample output:

3) Sum Variables Program

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Flow Chart:

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Pseudo Code:

1. BEGIN
2. INPUT var1, var2
3. PRINT var1+var2
4. END

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PHP Language sample code:

sumvariables.php

<?php //assume user input 1,2 $var1=1; $var2=2; echo $var1+$var2; ?>

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Live code at ideone.com: http://ideone.com/bIhdOJ

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PHP Language sample output:

4) Multiply Variables Program

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Flow Chart:

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Pseudo Code:

1. BEGIN
2. INPUT var1, var2
3. PRINT var1 x var2
4. END

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PHP Language sample code:

multiplyvariables.php

<?php //assume user input 1,2 $var1=1; $var2=2; echo $var1*$var2; ?>

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Live code at ideone.com: http://ideone.com/e2o1a4

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PHP Language sample output:

5) Divide Variables Program

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Flow Chart:

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Pseudo Code:

1. BEGIN
2. INPUT var1, var2
3. IF var2=0
4. THEN PRINT "Error. Division by zero."
5. ELSE PRINT var1/var2
6. END

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PHP Language sample code:

dividevariables.php

<?php //assume input 1,0 $var1=1; $var2=0; if ($var2==0) { echo "Error. Division by zero.";} else { echo $var1/$var2;} ?>

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Live code at ideone.com: http://ideone.com/3CQlTb

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PHP Language sample output:

6) Count Numbers Program

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Flow Chart:

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Pseudo Code:

1. BEGIN
2. PRINT "Start counting."
3. FOR i LOOP := 1 to 3
4.     PRINT i
5. END LOOP
6. PRINT "Done."
7. END

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PHP Language sample code:

Note: PHP array index number starts with 0.

countnumbers.php

<?php echo "Start counting."."<br/>"; for ($x=0; $x<3; $x++) {   echo $x."<br/>"; } echo "Counting done."."<br/>"; ?>

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Live code at ideone.com: http://ideone.com/0tGlsC

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PHP Language sample output:

7) Display Array Values Program

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Flow Chart:

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Pseudo Code:

1. BEGIN
2. INITIALIZE ARRAY arr[5] TO CONTAIN VALUES 1,2,3,4,5
3. PRINT "Displaying array values."
4. FOR i := 1 to 5
5.    PRINT arr[i]
6. END FOR LOOP
7. PRINT "Done."
8. END

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PHP Language sample code:

displayarrayvalues.php

<?php $arr=array("1","2","3","4","5"); echo "Display array values"."<br/>"; for ($x=0; $x<5; $x++) {   echo $arr[$x]."<br/>"; } echo "Done"."<br/>"; ?>

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Live code at ideone.com: http://ideone.com/f9WZHR

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PHP Language sample output:

8) Edit Array Values Program

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Note:
This tutorial demonstrates the steps to edit an array value. The program displays the array values before and after the edit is done. There are code redundancies here. Ignore this for now.

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Flow Chart:

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Pseudo Code:

1. BEGIN
2. INITIALIZE ARRAY arr[i] WITH VALUES 1,2,3,4,5
3. FOR i := 1 to 5
4.   PRINT arr[i]
5. END FOR LOOP
6. INPUT indexnumber
7. INPUT arrayvalue
8. arr[indexnumber] = arrayvalue
9. FOR i := 1 to 5
10.   PRINT arr[i]
11. END FOR LOOP

12. END

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PHP Language sample code:

editarrayvalues.php

<?php $arr=array(1,2,3,4,5); echo "Display array values"."<br/>"; for ($x=0; $x<5; $x++) {   echo $arr[$x]."<br/>"; } echo "Done"."<br/>"; $indexnumber=0; $arrayvalue=2; $arr[$indexnumber]=$arrayvalue; echo "Display array values"."<br/>"; for ($x=0; $x<5; $x++) {   echo $arr[$x]."<br/>"; } echo "Done"."<br/>"; ?>

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Live code at ideone.com: http://ideone.com/hLkNXY

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PHP Language sample output:

9) Modular Program

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Flow Chart:

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Pseudo Code:
1. BEGIN displaydata
2.   FOR all item in array PRINT item values
3. END displaydata

1. BEGIN updatedata
2.   INPUT indexnumber, arrayvalue
3.   arr[indexnumber]=arrayvalue

4. END updatedata

1. BEGIN main
2.   CALL displaydata
3.   CALL updatedata
4.   CALL displaydata
5. END main

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PHP Language sample code:

Note: We use parameter passing here; passing by value=$arr and passing by reference=&$arr

modularprogram.php

<?php $arr=array(1,2,3,4,5); function displayData($arr){         echo "Display array values"."<br/>";         for ($x=0; $x<5; $x++) {           echo $arr[$x]."<br/>"; } echo "Done"."<br/>"; } function updateData(&$arr){         echo "Updating Data..."."<br/>";         $indexnumber=0;         $arrayvalue=2;         $arr[$indexnumber]=$arrayvalue; } displayData($arr); updateData($arr); displayData($arr); ?>

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Live code at ideone.com: http://ideone.com/9jos47

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PHP Language sample output:

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