如何将post值从angular2捕获到本地主机的php文件中

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

@Injectable({
  providedIn: 'root'
})
export class DataService {

  constructor(private http: HttpClient) { }

  postData(data: any) {
    return this.http.post('http://localhost/path/to/php/file.php', data);
  }
}

import { Component } from '@angular/core';
import { DataService } from './data.service';

@Component({
  selector: 'app-root',
  template: `
    <button (click)="sendData()">Send Data</button>
  `
})
export class AppComponent {

  constructor(private dataService: DataService) { }

  sendData() {
    const data = { key: 'value' }; // 替换为实际的数据
    this.dataService.postData(data).subscribe(response => {
      console.log(response);
    });
  }
}

<?php
$data = $_POST['key']; // 替换为实际的POST参数名
echo $data;
?>