Recover in PHP

In PHP, we don’t have a direct equivalent of Go’s panic and recover mechanisms. However, we can achieve similar functionality using PHP’s exception handling system. Here’s how we can translate the concept:

<?php

// This function throws an exception
function mayThrowException() {
    throw new Exception("a problem");
}

// Main execution
try {
    // The code that might throw an exception is wrapped in a try block
    $closure = function() {
        mayThrowException();
        
        // This code will not run if mayThrowException() throws an exception
        echo "After mayThrowException()\n";
    };

    $closure();
} catch (Exception $e) {
    // This is similar to the deferred function with recover in Go
    echo "Caught. Error:\n" . $e->getMessage() . "\n";
}

In PHP, we use a try-catch block to handle exceptions, which is conceptually similar to Go’s panic and recover mechanism. The try block contains the code that might throw an exception, and the catch block handles any exceptions that are thrown.

The mayThrowException() function throws an exception, which is analogous to the panic() in the Go code.

The main execution is wrapped in a try block. If an exception is thrown, the code execution immediately jumps to the catch block, similar to how a panic in Go causes execution to jump to the deferred function with recover.

The catch block catches the exception and prints the error message, which is similar to what the deferred function with recover does in the Go code.

To run this PHP script, save it to a file (e.g., exception_handling.php) and execute it using the PHP command:

$ php exception_handling.php
Caught. Error:
a problem

This output shows that the exception was caught and handled, similar to how the panic was recovered in the Go example.

While PHP’s exception handling system differs from Go’s panic and recover, it serves a similar purpose of allowing you to handle and recover from errors in a controlled manner.