Let’s begin our coding quest

Overview

1. Frontend Journey with Angular: Angular acts as our herald, dynamically presenting error messages to the user. It’s flexible enough to communicate with the backend, fetching the specifics of the error encountered.
2. Backend Quest with PHP: The PHP backend serves as the keeper of knowledge, providing details about the errors through an API endpoint that our Angular front-end can consult.

Step 1: Setting Up the Angular Environment

The first step in our quest is to prepare our Angular environment:

ng new error-handling-app
cd error-handling-app
ng serve

Step 2: Enchanting the Angular AppComponent

To capture and display errors, we modify the src/app/app.component.ts:

import { Component } from '@angular/core';
import { HttpClient } from '@angular/common/http';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent {
  title = 'Error Handling App';
  errorMessage: string = '';

  constructor(private http: HttpClient) {}

  ngOnInit() {
    this.fetchError();
  }

  fetchError() {
    this.http.get<{error: string}>('/api/error')
      .subscribe(
        response => this.errorMessage = response.error,
        error => this.errorMessage = 'Failed to fetch error details.'
      );
  }
}

And within the src/app/app.component.html, we conjure the error message into visibility:

<div class="container">
  <h1>Error Occurred</h1>
  <p>{{ errorMessage }}</p>
  <a href="/">Go Back to Home</a>
</div>

Step 3: Crafting the Backend (PHP) API Endpoint

On the PHP side, we establish an API endpoint that our Angular front-end will consult to glean error details:

<?php
header('Content-Type: application/json');

$response = ['error' => 'An unexpected error occurred. Please try again later.'];

echo json_encode($response);
?>

Step 4: Uniting Frontend and Backend

• Angular App: After building the Angular app (ng build), it can be served through a web server or intertwined within your PHP application.
• PHP Backend: Make sure the PHP backend is accessible to the Angular app, especially considering CORS if they’re hosted separately.