我有一個按鈕，可以將成分添加到數據庫中。單擊按鈕時，用戶可以使用 Javascript 添加成分的名稱、測量值和單位：function addIngredient() {  var area = document.getElementById("addedIngredient");  var num = document.createElement("p");  numText = document.createTextNode(countIngredient + ". ");  num.appendChild(numText);  area.appendChild(num);  //Ingredient Name  var ingredientNameLabel = document.createElement("p");  ingredientNameLabelText = document.createTextNode("Name");  ingredientNameLabel.appendChild(ingredientNameLabelText);  area.appendChild(ingredientNameLabel);  countIngredient++;  var ingredientNameInput = document.createElement("INPUT");  ingredientNameInput.setAttribute("name", "ingredient_name[]");  ingredientNameInput.setAttribute("type", "text");  ingredientNameInput.setAttribute("class", "form-control");  ingredientNameInput.setAttribute("class", "ingName");  area.appendChild(ingredientNameInput);  //Ingredient Measure  var ingredientMeasureLabel = document.createElement("p");  ingredientMeasureLabelText = document.createTextNode("Measure");  ingredientMeasureLabel.appendChild(ingredientMeasureLabelText);  area.appendChild(ingredientMeasureLabel);  var ingredientMeasureInput = document.createElement("INPUT");  ingredientMeasureInput.setAttribute("name", "ingredient_measure[]");  ingredientMeasureInput.setAttribute("type", "text");  ingredientMeasureInput.setAttribute("class", "form-control");  ingredientMeasureInput.setAttribute("class", "ingMeasure");  area.appendChild(ingredientMeasureInput);   //Ingredient Unit   var ingredientUnitLabel = document.createElement("p");   ingredientUnitLabelText = document.createTextNode("Unit");   ingredientUnitLabel.appendChild(ingredientUnitLabelText);   area.appendChild(ingredientUnitLabel);}我希望為添加的每種成分選擇單位。誰能告訴我如何使用 PHP 來做到這一點？我正在嘗試以下方法：$units = [];foreach ($_POST["ingredient_unit[]"] as $key => $unit) {        array_push($units, $unit);    }這不起作用，也不會給出錯誤。