elseif

The PHP "elseif" Keyword: A Comprehensive Guide

The elseif keyword is a control structure in PHP that allows you to evaluate an additional condition when the initial if condition evaluates to false. In this article, we will explore the syntax and usage of the elseif keyword in depth, and provide plenty of examples to help you master this important PHP feature.

Syntax

Here is the basic syntax for using the elseif keyword in PHP:

The PHP syntax of ELSEIF

<‌?php

if (condition1) {
  // code to be executed if condition1 is true
} elseif (condition2) {
  // code to be executed if condition1 is false and condition2 is true
} else {
  // code to be executed if both condition1 and condition2 are false
}

In this example, the elseif block runs only if the first condition is false and the second condition is true.

Examples

Let's look at some practical examples of how the elseif keyword can be used:

Examples of PHP elseif

<‌?php

// Example 1
$myNumber = 5;
if ($myNumber == 4) {
  echo "Number is 4";
} elseif ($myNumber == 5) {
  echo "Number is 5" . PHP_EOL;
} else {
  echo "Number is not 4 or 5";
}

// Output: Number is 5

// Example 2
$myString = "hello";
if ($myString == "hi") {
  echo "Greeting is hi";
} elseif ($myString == "hello") {
  echo "Greeting is hello" . PHP_EOL;
} else {
  echo "Greeting is not recognized";
}

// Output: Greeting is hello

Try it Yourself »

These examples demonstrate how elseif evaluates subsequent conditions only when previous ones fail.

Benefits

Using the elseif keyword has several benefits, including:

• Improved readability: Chains of elseif statements make it clear that multiple related conditions are being evaluated in sequence.
• Efficient execution: PHP stops evaluating conditions as soon as one matches, avoiding unnecessary checks and keeping the logic streamlined compared to nested or independent if statements.

Conclusion

In conclusion, the elseif keyword is a powerful tool for PHP developers, enabling clear and efficient evaluation of multiple conditions. We hope this comprehensive guide has been helpful, and we wish you the best of luck as you continue to develop your PHP skills.

Practice

What is correct about the 'elseif' statement in PHP?

'elseif' is an alternate option which will execute if the original if statement is false.'elseif' can be used without an 'if' statement.'elseif' statement does not require a condition to be specified.'elseif' can be used multiple times within an if-else structure.In an 'if' condtional structure, if 'elseif' statement is true, 'else' statement will also execute.