how to echo input text in For{} - php

Question

I write below code and put an html input text in for :
for($i=0;$i<5;$i++)
echo '<input type="text" name="subject">';
but when i want to echo the that value I type in to the above text box
it returns "" nothing
echo $_POST['subject'];
I have
<form name="form1" method="post" action="index.php">
Tag top of this codes ?
Sorry if I had Mistake

Answer 1

Make the input as array and read the values in PHP using loop like below.
HTML code :
<form name='myForm' action='index.php' method="post">
<?php
for {$i=i;$i<5;$i++} {
echo "<input type='text' name='subject[]'>";
}
?>
</form>
PHP Code :
$subjectArray = $_POST['subject'];
foreach($subjectArray as $key => $val) {
if($val != "") {
echo $key."==".$val."<br>";
}
}

Answer 2

It's bad manner to echo your HTML code. It can become annoyingly hard for someone to read the code after you (for exemple, in a company)
I would suggest doing this:
for($i=0;$i<5;$i++) {
?><input type="text" name="subject"><?php
}

Answer 3

If you want to input back in the form what was just typed, then you're doing too much.
Is your form in index.php too?! If so, action="index.php" become action=""
• With your array:
$subjectArray= array();
// Gather data from $_POST if it's the subject form
if(!empty($_POST) aa isset $_POST['subjectForm']) {
// Remove the hidden input from the list
unset($_POST['subjectForm']);
// Add the remaining entry to $subjectArray
foreach($_POST as $key => $value) {
$subjectArray[$key]= $value;
}
}
<form name="myForm" action="" method="post">
<!-- hidden input to find our form after validation -->
<input type="hidden" name="subjectForm" value=1>
<?php
for($i=1; $i<=5; $i++) {
?><input type="text" name="subject<?= $i ?>" value="<?php if(isset(subjectArray['subject'.$i])) { echo $_POST['subjectArray'.$i]; } ?>"><?php
}
?>
</form>
• Without your array:
<form name="myForm" action="" method="post">
<?php
for($i=1; $i<=5; $i++) {
?><input type="text" name="subject<?= $i ?>" value="<?php if(isset($_POST['subject'.$i])) { echo $_POST['subjectArray'.$i]; } ?>"><?php
}
?>
</form>