8) Conditional Statement

While writing code, when you want to perform different actions depending on conditions you will use a conditional statement in your code

Example:

if(condition is true) {
 	//do something
}

if(condition is true) {

//do something

}

If the condition is true the block will execute otherwise whole block will be ignored. If you have some alternative condition then we use else

if(condition is true) {
 	//do something
}else{
	//do something different
}

if(condition is true) {

//do something

}else{

//do something different

}

You can chain condition also

if(condition is true) {
 	//do something
} elseif{
	//do another task
} else {
     //Do something different
}

if(condition is true) {

//do something

} elseif{

//do another task

} else {

//Do something different

}

If the first condition is true first is executed and if second is true second is executed but if both are true only first is executed.

Operator	Meaning	Operator	Meaning
===	Identical	!==	Not Identical
<	Less than	>	Greater than
<=	Less than or equal	>=	Greater than or equal to

Note:

Always use a double equal sign for if statement using single equal will always evaluate to true as it assigns a value instead of comparing it.
Difference between equal and identical refers to data type. For example

$var = 47 ;
$var2 = '47';

if($var == $var2){
  echo "Both are equal";
}

if($var === $var2){
 echo "both are identical";
}

$var = 47 ;

$var2 = '47';

if($var == $var2){

echo "Both are equal";

}

if($var === $var2){

echo "both are identical";

}

Here both are equal, not identical.

Example of if/else if/else

$name = 'Kritika' ;
$age = 27;
if($name == 'kritika' && $age==27){
  echo "my name is correct";
}elseif($name == 'devesh' || $age==27){
	echo "name is not correct";
}else{
  echo "else part";
}

$name = 'Kritika' ;

$age = 27;

if($name == 'kritika' && $age==27){

echo "my name is correct";

}elseif($name == 'devesh' || $age==27){

echo "name is not correct";

}else{

echo "else part";

}

Other syntax for if else

We can avoid braces and use the following syntax for if else condition also

$name = 'Kritika' ;
$age = 27;
if($name == 'kritika' && $age==27):
  echo "my name is correct";
elseif($name == 'devesh' || $age==27):
	echo "name is not correct";
else:
  echo "else part";
endif;

$name = 'Kritika' ;

$age = 27;

if($name == 'kritika' && $age==27):

echo "my name is correct";

elseif($name == 'devesh' || $age==27):

echo "name is not correct";

else:

echo "else part";

endif;

Note: when using braces elseif can be broken into two words however here elseif is written as one word only.