How to insert an html input array into mysql using PDO - php

Question

I have an HTML form that has 2 dynamic fields which are:
<input type="text" name="ingredients[]" placeholder="Ingredients"/></div>
<input type="text" name="quantity[]" placeholder="Quantity"/></div>
Look here this is how the db table should be for those inputs in the form
Ing 1 1001 1KG
Ing 2 1001 2KG
ing 3 1001 3KG
now check the image and you'll see what's happening
DB Ingredients TABLE
I have the recipe-ID in my php file I just want a PDO code that help me to INSERT "ingredients", "quantity" and "$recipe_ID" each one on a row.
<?php
header('Content-type: application/json');
require_once 'db/pdoconnect.php';
if($_POST)
{
$sth = $con->prepare("SELECT `recipeid` FROM Recipes ORDER BY `recipeid` DESC");
$sth->execute();
$previousid = $sth->fetchColumn();
$offset=1;
$generatingid=$previousid+$offset;
$newid=$generatingid;
//print("Last Id=$previousid\n");
//print("New Id=$newid\n");
$title = $_POST['title'];
$preptime = $_POST['preptime'];
$cocktime = $_POST['cocktime'];
$level = $_POST['level'];
$serving = $_POST['serving'];
$recipetype = $_POST['recipetype'];
$intro = $_POST['intro'];
$details = $_POST['details'];
$image = $_POST['image'];
try
{
$stmt = $con->prepare("INSERT INTO Recipes (recipeid,title,preptime,cocktime,level,serving,recipetype,intro,details,recipeimg) VALUES( :newid, :title, :preptime, :cocktime, :level, :serving, :recipetype, :intro, :details, :image)");
$stmt->bindParam(":newid",$newid);
$stmt->bindParam(":title",$title);
$stmt->bindParam(":preptime",$preptime);
$stmt->bindParam(":cocktime",$cocktime);
$stmt->bindParam(":level",$level);
$stmt->bindParam(":serving",$serving);
$stmt->bindParam(":recipetype",$recipetype);
$stmt->bindParam(":intro",$intro);
$stmt->bindParam(":details",$details);
$stmt->bindParam(":image",$image);
if($stmt->execute()) { //check if main query has been executed
$sql = "INSERT INTO Ingredients VALUES";
for($i = 1 ; $i <= count($_POST['ingredients']) ; $i++){
$sql .= " (:recipeid" .$i. ", :ingredient" .$i. ", :quantity" .$i. "),";
}
// remove the last (,) from the $sql
$sql = rtrim($sql, ',');
$sth = $con->prepare($sql);
// binding parameters
for($i = 1 ; $i <= count($_POST['ingredients']) ; $i++){
$varIng = $_POST['ingredients'][$i];
$varQnty = $_POST['quantity'][$i];
$sth->bindParam(':recipeid' .$i , $newid , PDO::PARAM_STR);
$sth->bindParam(':ingredient' .$i , $varIng , PDO::PARAM_STR);
$sth->bindParam(':quantity' .$i , $varQnty , PDO::PARAM_STR);
}
if ($sth->execute()) {
$response_array['status'] = 'success';
}
}//END OF FIRST IF STATEMENT
else{
$response_array['status'] = 'error';
}
echo json_encode($response_array); //SEND THE RESPONSE
}//END OF TRY
catch(PDOException $e){
echo $e->getMessage();
}
}
?>

Answer 1

Assuming the table's name shown in the image you posted in your question ingredient_quantity in your database, and you said you already have the recipe-ID PHP Fiddle
<?php
$newid = 'A10';
//considering this is your table shown in the picture
$sql = "INSERT INTO ingredient_quantity VALUES";
for($i = 1 ; $i <= count($_POST['ingredients']) ; $i++){
$sql .= " (:newid" .$i. ", :ingredient" .$i. ", :quantity" .$i. "),";
}
// remove the last (,) from the $sql
$sql = rtrim($sql, ',');
$sth = $con->prepare($sql);
// binding parameters
for($i = 1 ; $i <= count($_POST['ingredients']) ; $i++){
$varIng = $_POST['ingredients'][$i];
$varQnty = $_POST['quantity'][$i];
$sth->bindParam(':newid' .$i , $newid , PDO::PARAM_STR);
$sth->bindParam(':ingredient' .$i , $varIng , PDO::PARAM_STR);
$sth->bindParam(':quantity' .$i , $varQnty , PDO::PARAM_STR);
}
$sth->execute();
?>
EDIT 1:
for the above code I have an error as the ingredients[] array starts from 0 and not 1, the final index of the for loop will be undefined, so work around it make the last for loop like the following:
for($i = 0 ; $i < count($_POST['ingredients']) ; $i++){
$varIng = $_POST['ingredients'][$i];
$varQnty = $_POST['quantity'][$i];
$j = $i + 1;
$sth->bindParam(':newid' .$j , $newid , PDO::PARAM_STR);
$sth->bindParam(':ingredient' .$j , $varIng , PDO::PARAM_STR);
$sth->bindParam(':quantity' .$j , $varQnty , PDO::PARAM_STR);
}
EDIT 2:
You may try doing it with ? placeholders instead of named placeholders like this PHP Fiddle 2:
//considering this is your table shown in the picture
$sql = "INSERT INTO ingredient_quantity VALUES";
for($i = 0 ; $i < count($_POST['ingredients']) ; $i++){
$sql .= " ( ? , ? , ? ) , ";
}
// remove the last (,) from the $sql
$sql = rtrim($sql, ',');
$sth = $con->prepare($sql);
// binding parameters
$j = 1;
for($i = 0 ; $i < count($_POST['ingredients']) ; $i++){
$varIng = $_POST['ingredients'][$i];
$varQnty = $_POST['quantity'][$i];
$sth->bindValue( $j , $varIng);
$sth->bindValue( $j + 1, $newid);
$sth->bindValue( $j + 2, $varQnty);
$j += 3;
}
$sth->execute();