if statement in PHP

if statements works like this
if (condition is true)
{
Execute code;
}
i.e. id statements only executes specified code if the condition is true otherwise code is completely ignored and is not executed.

Example

$int i= 4;
If (i < 5)
{
  echo "value of i is greater then 5";
}

We use the various operators to create condition in if statements.

Using > and < operators

Greater than and less than operators are commonly used operators.
You can compare constant, constant with variables and variables.
See the Example:

If (5 < 10)
{
  echo "5 is less than ten";
}

Using == and === operators

Equality operator is used for checking the exact match condition, see this:

$int i= 5;
If (i == 5)
{
  echo "value of i is 5";
}
else
{
echo "value of i is not 5";
}

And === operator evaluates to true only if values are equal and data types of the values are also equal, see the example:

$int i= 5;
$int j= 5;
If (i === j)
{
  echo "both variables are equal";
}

The != and <> operators

Inequality is the reverse of the equality operator(==). See the following:

$int i= 5;
If (i!= 7)
{
  echo "value of i is not 7";
}

Or we can use also <> operator for getting the same result:

$int i= 5;
If (i <> 7)
{
  echo "value of i is not 7";
}