json dosn'tの結果とPHPで表示されないエラー

Question

私はjsonで結果を与えるphpのコードを持っています。ここではブラウザ上でPHPスクリプトを試しても結果はありません。ここにphpファイルとmysqlテーブルがあります

<?php 
    //Importing Database Script 
    require_once('dbConnect.php'); 

    //Creating sql query 
    $sql = "SELECT * FROM EnfantVaccin"; 

    //getting result 
    $r = mysqli_query($con,$sql); 

    //creating a blank array 
    $result = array(); 

    //looping through all the records fetched 
    while($row = mysqli_fetch_array($r)){ 

     //Pushing name and id in the blank array created 
     array_push($result,array(
      "enfant_vacc_id"=>$row['enfant_vacc_id'], 
      "enfant_id"=>$row['enfant_id'], 
      "nomVaccin"=>$row['nomVaccin'], 
      "ageApproprie"=>$row['ageApproprie'], 
      "etat"=>$row['etat'], 
      "date_vaccin"=>$row['date_vaccin'] 
     )); 
    } 

    //Displaying the array in json format w samineh result itableau fi json format 5ater valeur mta3 notre TAG_JSON_ARRAY hia result 
    echo json_encode(array('resultVaccinEnf'=>$result)); 

    mysqli_close($con); 

、それはMySQLのテーブルの 'EnfantVaccin'

CREATE TABLE `EnfantVaccin`(
`enfant_vacc_id` bigint(50) unsigned NULL DEFAULT NULL AUTO_INCREMENT, 
`enfant_id` bigint(50) unsigned NULL DEFAULT NULL , 
`nomVaccin` varchar(20) NOT NULL, 
`ageApproprie` int(10) NOT NULL, 
`etat` boolean NOt null ,/*ca indique si ce vaccin particulier est fait pour cet enfant particulier ou pas */ 
`date_vaccin` date not null,/*indique la date de ce vaccin pour cet enfant*/ 
PRIMARY KEY (`enfant_vacc_id`) , 
CONSTRAINT `FK_enf2` FOREIGN KEY (`enfant_id`) REFERENCES `enfant` (`enfant_id`) 
)ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8; 

、それは

enter image description here

テーブルに私が持っている行です

私は

Answer 1

if($stmt = mysqli_prepare($con, $sql)){ 
     //execute query 
     mysqli_stmt_execute($stmt); 
     //bind results 
     mysqli_stmt_bind_result($stmt, $enfant_vacc_id, $enfant_id, $nomVaccin, $ageApproprie, $etat, 
     $date_vaccin); 
     //store result so num rows can be counted 
     $r = mysqli_stmt_store_result($stmt); 
     $result = array(); 
     //fetch results 
     while (mysqli_fetch_array($r)) { 
     //Pushing name and id in the blank array created 
     array_push($result,array(
      "enfant_vacc_id"=>$enfant_vacc_id, 
      "enfant_id"=>$enfant_id, 
      "nomVaccin"=>$nomVaccin, 
      "ageApproprie"=>$ageApproprie, 
      "etat"=>$etat, 
      "date_vaccin"=>$date_vaccin 
     )); 
     } 
     //Displaying the array in json format w samineh result itableau fi json format 5ater valeur mta3 notre TAG_JSON_ARRAY hia result 
    echo json_encode(array('resultVaccinEnf'=>$result)); 
    mysqli_close($con); 
    } 
    else { 
    // Error 
    printf("Prepared Statement Error: %s\n", $db->error); 
    }