Find the variable generated in loop of php - php

Question

I have this php code:
for($i=0;$i<3;$i++) {
echo 'Question'.$i.'</br>';
echo 'Answer..</br>';
echo '<form action="" method="POST">';
echo '<textarea name="answer"></textarea>';
echo '</br><button name="answer_button'.$i.'"><b>Answer</b></button>';
echo '</form>';
}
Now I want to get the question number for which the answer_button is clicked.
Closest I could get was this:
for($i=0;$i<3;$i++) {
echo 'Question'.$i.'</br>';
echo 'Answer..</br>';
echo '<form action="" method="POST">';
echo '<textarea name="answer"></textarea>';
echo '</br><button name="answer_button"><b>Answer</b></button>';
echo '</form>';
if(isset($_POST['answer_button'])) {
echo $i;
break;
}
}
This gives me Question number but it will not print other questions in loop once the button is clicked.
Is there no solution without using javaScript?

Answer 1

This should work :
for($i=0;$i<3;$i++) {
echo 'Question'.$i.'</br>';
echo 'Answer..</br>';
echo '<form action="" method="POST">';
echo '<textarea name="answer"></textarea>';
echo '</br><button name="answer_button'.$i.'"><b>Answer</b></button>';
echo '</form>';
echo '</div>';
}
for($i=0;$i<3;$i++) {
if(isset($_POST["answer_button".$i])) {
echo $i;
}
}
Hope it helps.

Answer 2

Change the html markup to use an "array notation":
echo '<button name="answer_button['.$i.']" type="submit">Answer</button>';
That will cause php to populate an array when receiving back the form which you can examine:
<?php
// ...
if(isset($_POST['answer_button']) && is_array($_POST['answer_button'])) {
$id = array_shift(array_keys($_POST['answer_button']));
// ...
}
This allows to have multiple such buttons in a single form and detect which one has actually been clicked. It works, because $_POST will contain an array with a single element with key as in $id, which you can easily examine yourself with a var_dump($_POST); or similar.

Answer 3

I think this is what your looking for.
CODE
<?php
echo '<form action="" method="POST">';
for ($i = 0; $i < 3; $i++) {
echo 'Question: ' . $i . '<br>';
echo 'Answer..<br>';
echo "<textarea name='answer[$i]'> </textarea></br>";
echo "</br><button name='answer_button[$i]' value='BtnPushed'> <b>Answer</b></button><br>";
if (! empty($_POST['answer_button'][$i])) echo "Last Answer: {$_POST['answer'][$i]}<br>";
echo '<hr>';
}
echo '</form>';
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