How do I fetch data from MySQL in React Native and PHP using a search engine?

this.is my php file:

$con = mysqli_connect($HostName,$HostUser,$password,$db); // Getting the received JSON into $json variable. $json = file_get_contents('php://input'); // decoding the received JSON and store into $obj variable. $obj = json_decode($json,true); // Populate ID from JSON $obj array and store into $ID.$ID = $obj['numero'];//Fetching the selected record.$CheckSQL = "SELECT origine FROM envoi WHERE numero='$ID'";$result = $con->query($CheckSQL);if ($result->num_rows >0) { while($row[] = $result->fetch_assoc()) { $Item = $row; $json = json_encode($Item); echo $json; }}else {   $EmailExistMSG= "No Results Found."; $EmailExistJson = json_encode($EmailExistMSG); echo $EmailExistJson ; }

And this is my react native script where i should enter number and fetch his data if it's exist in my database:

search= () =>{     //alert('ok');     const {numero}=this.state;     fetch('http://192.168.1.4:80/search.php',{     method:'post',     header:{     'Accept':'application/json',     'Content-type' :'application/json'     },     body:JSON.stringify({numero:numero})}).then((responseData)=>responseData.json()).then((responseJson)=>{alert(responseJson)}).catch((error)=>{console.error(error);})}  render(){    return(          <View style={styles.pass}>          <TextInput placeholder="Saisir le numéro de suivi de l'envoi"   onChangeText= {numero=>this.setState({numero})}/>          <TouchableOpacity onPress={this.search} style={{marginTop:20,marginLeft:70}}>          <Icon name="search"  size={20}/>          </TouchableOpacity>          </View>    )  }