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PHP 5 if...else...elseif Statements
 
Conditional statements are used to perform different actions based on different conditions.

 
PHP Conditional Statements
 
Very often when you write code, you want to perform different actions for different conditions. You can use conditional statements in your code to do this.
 
In PHP we have the following conditional statements:
  • if statement - executes some code if one condition is true
  • if...else statement - executes some code if a condition is true and another code if that condition is false
  • if...elseif....else statement - executes different codes for more than two conditions
  • switch statement - selects one of many blocks of code to be executed
     
PHP - The if Statement
 
The if statement executes some code if one condition is true.

 
Syntax
  1. if (condition) {
  2.     code to be executed if condition is true;
  3. }
The example below will output "Have a good day!" if the current time (HOUR) is less than 20:
 
Example
  1. <?php
  2. $t = date("H");
  3. if ($t < "20") {
  4.     echo "Have a good day!";
  5. }
  6. ?>
     
PHP - 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
  1. if (condition) {
  2.     code to be executed if condition is true;
  3. } else {
  4.     code to be executed if condition is false;
  5. }
     
The example below will output "Have a good day!" if the current time is less than 20, and "Have a good night!" otherwise:
 
Example
  1. <?php
  2. $t = date("H");
  3. if ($t < "20") {
  4.     echo "Have a good day!";
  5. } else {
  6.     echo "Have a good night!";
  7. }
  8. ?>
 
PHP - The if...elseif....else Statement
 
The if....elseif...else statement executes different codes for more than two conditions.
 
Syntax
  1. if (condition) {
  2.     code to be executed if this condition is true;
  3. } elseif (condition) {
  4.     code to be executed if this condition is true;
  5. } else {
  6.     code to be executed if all conditions are false;
  7. }
The example below will output "Have a good morning!" if the current time is less than 10, and "Have a good day!" if the current time is less than 20. Otherwise it will output "Have a good night!":
 
Example
  1. <?php
  2. $t = date("H");
  3. if ($t < "10") {
  4.     echo "Have a good morning!";
  5. } elseif ($t < "20") {
  6.     echo "Have a good day!";
  7. } else {
  8.     echo "Have a good night!";
  9. }
  10. ?>
     
PHP - The switch Statement
 
The switch statement will be explained in the next chapter.


2016-12-08
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