Showing posts with label PHP. Show all posts
Showing posts with label PHP. Show all posts
Tuesday, 23 January 2018
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Tuesday, 3 January 2017
PHP Control Statements 1
PHP While Loop
PHP while loop can be used to
traverse set of code like for loop.
It should be used if number of
iteration is not known.
Syntax
1.
while(condition){
2.
//code to be executed
3.
}
Alternative Syntax
1.
while(condition):
2.
//code to be executed
3.
4.
endwhile;
PHP While Loop Flowchart
PHP While Loop Example
1.
<?php
2.
$n=1;
3.
while($n<=10){
4.
echo "$n<br/>";
5.
$n++;
6.
}
7.
?>
Output:
1
2
3
4
5
6
7
8
9
10
Alternative Example
1.
<?php
2.
$n=1;
3.
while($n<=10):
4.
echo "$n<br/>";
5.
$n++;
6.
endwhile;
7.
?>
Output:
1
2
3
4
5
6
7
8
9
10
PHP Nested While Loop
We can use while loop inside
another while loop in PHP, it is known as nested while loop.
In case of inner or nested while
loop, nested while loop is executed fully for one outer while loop. If outer
while loop is to be executed for 3 times and nested while loop for 3 times,
nested while loop will be executed 9 times (3 times for 1st outer loop, 3 times
for 2nd outer loop and 3 times for 3rd outer loop).
Example
1.
<?php
2.
$i=1;
3.
while($i<=3){
4.
$j=1;
5.
while($j<=3){
6.
echo "$i $j<br/>";
7.
$j++;
8.
}
9.
$i++;
10.
}
11.
?>
Output:
1 1
1 2
1 3
2 1
2 2
2 3
3 1
3 2
3 3
PHP do while loop
PHP do while loop can be used to
traverse set of code like php while loop. The PHP do-while loop is guaranteed
to run at least once.
It executes the code at least one
time always because condition is checked after executing the code.
Syntax
1.
do{
2.
//code to be executed
3.
}while(condition);
Flowchart
Example
1.
<?php
2.
$n=1;
3.
do{
4.
echo "$n<br/>";
5.
$n++;
6.
}while($n<=10);
7.
?>
Output:
1
2
3
4
5
6
7
8
9
10
PHP Break
PHP break statement breaks the
execution of current for, while, do-while, switch and for-each loop. If you use
break inside inner loop, it breaks the execution of inner loop only.
Syntax
1.
jump statement;
2.
break;
Flowchart
PHP Break: inside loop
Let's see a simple example to
break the execution of for loop if value of i is equal to 5.
1.
<?php
2.
for($i=1;$i<=10;$i++){
3.
echo "$i <br/>";
4.
if($i==5){
5.
break;
6.
}
7.
}
8.
?>
Output:
1
2
3
4
5
PHP Break: inside inner loop
The PHP break statement breaks
the execution of inner loop only.
1.
<?php
2.
for($i=1;$i<=3;$i++){
3.
for($j=1;$j<=3;$j++){
4.
echo "$i $j<br/>";
5.
if($i==2 && $j==2){
6.
break;
7.
}
8.
}
9.
}
10.
?>
Output:
1 1
1 2
1 3
2 1
2 2
3 1
3 2
3 3
PHP Break: inside switch statement
The PHP break statement breaks
the flow of switch case also.
1.
<?php
2.
$num=200;
3.
switch($num){
4.
case 100:
5.
echo("number is equals to 100");
6.
break;
7.
case 200:
8.
echo("number is equal to 200");
9.
break;
10.
case 50:
11.
echo("number is equal to 300");
12.
break;
13.
default:
14.
echo("number is not equal to 100, 200 or 500");
15.
}
16.
?>
Output:
number is equal to 200
PHP Control Statements
PHP If Else
PHP if else statement is used to test condition. There are various
ways to use if statement in PHP.
- if
- if-else
- if-else-if
- nested if
PHP If
Statement
PHP if statement is executed if condition is true.
Syntax
1.
if(condition){
2.
//code to be executed
3.
}
Flowchart
Example
1.
<?php
2.
$num=12;
3.
if($num<100){
4.
echo "$num is less than 100";
5.
}
6.
?>
Output:
12 is less than 100
PHP If-else Statement
PHP if-else statement is executed whether condition is true or
false.
Syntax
1.
if(condition){
2.
//code to be executed if true
3.
}else{
4.
//code to be executed if false
5.
}
Flowchart
Example
1.
<?php
2.
$num=12;
3.
if($num%2==0){
4.
echo "$num is even number";
5.
}else{
6.
echo "$num is odd number";
7.
}
8.
?>
Output:
12 is even number
PHP Switch
PHP switch statement is used to execute one statement from
multiple conditions. It works like PHP if-else-if statement.
Syntax
1.
switch(expression){
2.
case value1:
3.
//code to be executed
4.
break;
5.
case value2:
6.
//code to be executed
7.
break;
8.
......
9.
default:
10.
code to be executed if all cases are not matched;
11.
}
PHP Switch Flowchart
PHP Switch Example
1.
<?php
2.
$num=20;
3.
switch($num){
4.
case 10:
5.
echo("number is equals to 10");
6.
break;
7.
case 20:
8.
echo("number is equal to 20");
9.
break;
10.
case 30:
11.
echo("number is equal to 30");
12.
break;
13.
default:
14.
echo("number is not equal to 10, 20 or 30");
15.
}
16.
?>
Output:
number is equal to 20
PHP For Loop
PHP for loop can be used to traverse set of code for the specified
number of times.
It should be used if number of iteration is known otherwise use
while loop.
Syntax
1.
for(initialization; condition; increment/decrement){
2.
//code to be executed
3.
}
Flowchart
Example
1.
<?php
2.
for($n=1;$n<=10;$n++){
3.
echo "$n<br/>";
4.
}
5.
?>
Output:
1
2
3
4
5
6
7
8
9
10
PHP Nested For Loop
We can use for loop inside for loop in PHP, it is known as nested
for loop.
In case of inner or nested for loop, nested for loop is executed
fully for one outer for loop. If outer for loop is to be executed for 3 times
and inner for loop for 3 times, inner for loop will be executed 9 times (3
times for 1st outer loop, 3 times for 2nd outer loop and 3 times for 3rd outer
loop).
Example
1.
<?php
2.
for($i=1;$i<=3;$i++){
3.
for($j=1;$j<=3;$j++){
4.
echo "$i $j<br/>";
5.
}
6.
}
7.
?>
Output:
1 1
1 2
1 3
2 1
2 2
2 3
3 1
3 2
3 3
PHP For
Each Loop
PHP for each loop is used to traverse array elements.
Syntax
1.
foreach( $array as $var ){
2.
//code to be executed
3.
}
4.
?>
Example
1.
<?php
2.
$season=array("summer","winter","spring","autumn");
3.
foreach( $season as $arr ){
4.
echo "Season is: $arr<br />";
5.
}
6.
?>
Output:
Season is: summer
Season is: winter
Season is: spring
Season is: autumn
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