What is the Conditional statement in PHP

What is a Conditional or decisions making statement in php ?

Conditional statements are used to perform different actions based on different conditions.

You can use conditional statements in your code to make your decisions.

Conditional statements are extremely useful if you want to make your scripts dynamic, i.e.: making them react to a form submission or a certain value being applied to a specific variable.

What are the types of Conditional or decisions making statement in php ?

In PHP there are generally these following conditional statements:

1. if statement - executes some code if one condition is true
2. if...else statement - executes some code if a condition is true and another code if that condition is false
3. if...elseif...else statement - executes different codes for more than two conditions
4. switch statement - selects one of many blocks of code to be executed

---

1.The if Statement

If you want to execute some code if a condition is true , then you can use the if statement.

Syntax:

if (condition) {
    code to be executed if condition is true;
}

Example:

<?php
$t = date("H");

if ($t < "20") {
    echo "Have a good day!";
}
?>

2.The if...else Statement

The if...else statement executes some code if a condition is true and another code if that condition is false.

Syntax:

if (condition) {
    code to be executed if condition is true;
} else {
    code to be executed if condition is false;
}

Example:

<?php
$t = date("H");

if ($t < "20") {
    echo "Have a good day!";
} else {
    echo "Have a good night!";
}
?>

3.if...elseif....else Statement

The if...elseif...else statement executes different codes for more than two conditions.

Syntax

if (condition) {
    code to be executed if this condition is true;
} elseif (condition) {
    code to be executed if this condition is true;
} else {
    code to be executed if all conditions are false;
}

Example:

<?php
$t = date("H");

if ($t < "10") {
    echo "Have a good morning!";
} elseif ($t < "20") {
    echo "Have a good day!";
} else {
    echo "Have a good night!";
}
?>

4.Switch Statement

The switch statement is used  to select one of many blocks of code to be executed.

Syntax

switch (n) {
    case label1:
        code to be executed if n=label1;
        break;
    case label2:
        code to be executed if n=label2;
        break;
    case label3:
        code to be executed if n=label3;
        break;
    ...
    default:
        code to be executed if n is different from all labels;
}

Example:

<?php
$favcolor = "red";

switch ($favcolor) {
    case "red":
        echo "Your favorite color is red!";
        break;
    case "blue":
        echo "Your favorite color is blue!";
        break;
    case "green":
        echo "Your favorite color is green!";
        break;
    default:
        echo "Your favorite color is neither red, blue, nor green!";
}
?>