Need mail function inside index.php - php

Question

need to add mail() to my index.php I tried and it wont work.
I have tried this a couple different ways and have read the php webpage, Idk why its not working
<div class="card p-3">
<form action="insert.php" method="post" enctype="multipart/form-data">
<div class="form-group text-center">
<h3 style="color:#5892c5;">Schedule Your Free Quote</h3>
</div>
<div class="form-group">
<label for="exampleInputName">Name<span class="required"style="color:red;"> *</span></label>
<input type="text" name="customer" class="form-control" id="exampleInputName" aria-describedby="nameHelp" placeholder="Enter First + Last Name">
</div>
<div class="form-group">
<label for="exampleInputPhone">Phone Number<span class="required"style="color:red;"> *</span></label>
<input type="phone" name="phone" class="form-control" id="exampleInputPhone" aria-describedby="phoneHelp" placeholder="Enter Mobile Phone">
</div>
<div class="form-group">
<label for="exampleInputEmail1">Email address</label>
<input type="email" name="email" class="form-control" id="exampleInputEmail1" aria-describedby="emailHelp" placeholder="Enter email">
</div>
<div class="form-group">
<label for="exampleInputConcerns">Any Concerns?</label>
<textarea class="form-control rounded-0" name="concerns" id="exampleFormControlTextarea2" rows="3" placeholder="Message"></textarea>
</div>
<button type="submit" class="btn btn-primary">Submit</button>
</form>
<?php
$message = $_POST['name'] . $_POST['phone'] . $_POST['email'] . $_POST['concerns'];
$email_subject = "New Form submission";
$email_body = "You have received a new message from the user \n".
"Here is the message:\n $message".
$to = "my_email#email.com";
mail($to,$email_subject,$email_body);
?>
</div>

Answer 1

Try using PHPMailer. It's easy to implement, just download the package and follow the instructions on this page: https://github.com/PHPMailer/PHPMailer

Answer 2

You can use PHP mail() function as following:
<?php
$to = "emailName#email.com";
$subject = "New Lead";
$message = "'$customer' '$phone' '$email' '$concerns'";
mail($to,$subject,$message);
?>
Note: you should specify the Email Address by which you want to send the message. You can specify it in php.ini file. If you're still confused, you may want to visit: https://www.w3schools.com/php/func_mail_mail.asp to know more about this function.