PHP Exception Handling: Multiple catch blocks

Last update on May 29 2025 13:06:20 (UTC/GMT +8 hours)

7. Multiple Catch Blocks Implementation

Write a PHP program that implements multiple catch blocks to handle different types of exceptions.

Sample Solution:

PHP Code :

<?php
try {
    // Code that may throw different types of exceptions
    $number = "abc";
    
    if (!is_numeric($number)) {
        throw new InvalidArgumentException("Invalid number.");
    }
    
    $result = 100 / $number;
    echo "Result: " . $result;
} catch (InvalidArgumentException $e) {
    // Handle InvalidArgumentException
    echo "InvalidArgumentException: " . $e->getMessage();
} catch (DivisionByZeroError $e) {
    // Handle DivisionByZeroError
    echo "DivisionByZeroError: " . $e->getMessage();
} catch (Throwable $e) {
    // Handle generic Throwable (catches any other type of exception)
    echo "An error occurred: " . $e->getMessage();
}
?>

Sample Output:

InvalidArgumentException: Invalid number.

Explanation:

In the above exercise,

We have a try block that contains code that throws different types of exceptions. We first check if the $number is numeric using is_numeric() function and throw an InvalidArgumentException if it's not.

Then, we attempt a division operation with $number to trigger a DivisionByZeroError if the number is zero.

The catch blocks are defined to handle specific exception types.

The first catch block catches InvalidArgumentException and displays an appropriate error message.
The second catch block catches DivisionByZeroError and handles it accordingly.
The third catch block catches Throwable, which is the base class for all exceptions, and handles any other type of exception that may occur.

Flowchart:

For more Practice: Solve these Related Problems:

Write a PHP script that distinguishes between different exception types using multiple catch blocks to provide tailored error messages.
Write a PHP function that throws either a standard exception or a custom exception based on input parameters, and handle each with separate catch blocks.
Write a PHP program that demonstrates nested try-catch blocks, catching specific exceptions at different levels.
Write a PHP script to implement multiple catch clauses, where one catch block rethrows an exception to be handled by an outer catch block.

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