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php – HTML Element Array, name="something[]" or name="something"?

Posted by: admin April 23, 2020 Leave a comment

Questions:

I saw something on this site :
Handling array of HTML Form Elements in JavaScript and PHP
http://www.ajaxprojects.com/ajax/tutorialdetails.php?itemid=343

It said about put the array in name property and how the get the input collection’s value.
e.g. name="education[]"

But as I know, HTML input element is array-ready by name.
On client-side (GetElementsByName) or server-side ($_POST in PHP or Request.Form in ASP.NET)
for example: name="education", so what is the different with or with not the []?

How to&Answers:

PHP uses the square bracket syntax to convert form inputs into an array, so when you use name="education[]" you will get an array when you do this:

$educationValues = $_POST['education']; // Returns an array
print_r($educationValues); // Shows you all the values in the array

So for example:

<p><label>Please enter your most recent education<br>
    <input type="text" name="education[]">
</p>
<p><label>Please enter any previous education<br>
    <input type="text" name="education[]">
</p>
<p><label>Please enter any previous education<br>
    <input type="text" name="education[]">
</p>

Will give you all entered values inside of the $_POST['education'] array.

In JavaScript, it is more efficient to get the element by id…

document.getElementById("education1");

The id doesn’t have to match the name:

<p><label>Please enter your most recent education<br>
   <input type="text" name="education[]" id="education1">
</p>

Answer:

if you have check boxes you can pass an array of checked values.

<input type="checkbox" name="fruits[]" value="orange"/>
<input type="checkbox" name="fruits[]" value="apple"/>
<input type="checkbox" name="fruits[]" value="banana"/>

Also multiple select dropdowns

<select name="fruits[]" multiple>
    <option>apple</option>
    <option>orange</option>
    <option>pear</option>
</select>

Answer:

It’s different.
if you post this form:

<input type="text" name="education[]" value="1">
<input type="text" name="education[]" value="2">
<input type="text" name="education[]" value="3">

you will get an array in PHP, in this example you will get $_POST['education'] = [1, 2, 3].

if you post this form without []:

<input type="text" name="education" value="1">
<input type="text" name="education" value="2">
<input type="text" name="education" value="3">

you will get the last value, here you will get $_POST['education'] = 3.