cannot get file to upload in PhP - php

Question

I have added this to my form_action.php:
if(isset($_FILES['attachment1'])){
$errors= array();
$file_name = $_FILES['attachment1']['name'];
$file_size = $_FILES['attachment1']['size'];
$file_tmp = $_FILES['attachment1']['tmp_name'];
$file_type = $_FILES['attachment1']['type'];
$file_ext=strtolower(end(explode('.',$_FILES['attachment1']['name'])));
$expensions= array("jpeg","jpg","png","doc","pdf");
if(in_array($file_ext,$expensions)=== false){
$errors[]="extension not allowed, please choose a JPEG, PNG, PDF or DOC file.";
}
if(empty($errors)==true) {
move_uploaded_file($file_tmp,"uploads/".$file_name);
echo "Success";
}else{
print_r($errors);
}
}
with the form field being
<form method="post" action="form_action1.php">
<div class="form-group">
<label for="attachment1">Add file(s)</label>
<input type="file" class="form-control-file" id="attachment1" aria-describedby="fileHelp" name="attachment1">
<input type="file" class="form-control-file" id="attachment2" aria-describedby="fileHelp" name="attachment2">
<input type="file" class="form-control-file" id="attachment3" aria-describedby="fileHelp" name="attachment3">
</div>
</form>
The path gets saved but the file does not upload. Am I missing a step that I am not aware of? Also, can I set an ARRAY in the $_FILES field to allow for three uploads?
This is the last step in a personal project that I am trying to complete. Thank you.

Answer 1

You need to add enctype for the form to post files.
<form method="post" action="form_action1.php" enctype="multipart/form-data">
From MDN:
enctype
When the value of the method attribute is post, enctype is the MIME type of content that is used to submit the form to the server. Possible values are:
application/x-www-form-urlencoded: The default value if the attribute is not specified.
multipart/form-data: The value used for an element with the type attribute set to "file".
text/plain (HTML5): This value can be overridden by a formenctype attribute on a or element.