如何从输入字段中获取特定值

Question

My user can add his any audio from reverbnation.com. So user can copy his embed code and paste it my form input. I want my form get only two word from input text.

For example:- reverbnation embad code like as:

<iframe class="widget_iframe" src="https://www.reverbnation.com/widget_code/html_widget/artist_4859830?widget_id=50&amp;posted_by=label_265034&pwc[design]=customized&pwc[background_color]=%23d4c79f&pwc[included_songs]=0&pwc[song_ids]=23591473&pwc[photo]=0%2C1&pwc[size]=undefined" width="100%" height="100%" frameborder="0" scrolling="no"></iframe>

So if my user paste above embed code in form input field, I want to collect two word from above text to save it my sql database.

1. Artist Id = 4859830 (...artist_4859830?...)
2. Song Id = 23591473 (...&pwc[song_ids]=23591473...)

Please give me a guideline; How to collect above 2 id from input field.

My sql database: id | userid | artist | song

my form page:

if(isset($_POST['submit'])){
    $code = mysqli_real_escape_string($dbh, $_POST['code']);
    $userid = mysqli_real_escape_string($dbh, $_POST['userid']);

    $artist = How to get artist id (4859830) from $code 
    $song = How to get song id (23591473) from $code

    $result = mysqli_query($dbh,"INSERT INTO user_aideo (id, userid, artist, song) values('', '$userid', '$artist', '$song')");
}

<form id="form" method="post" action="">
   <input type="text" class="form-control" name="code"/>
   <input type="hidden" name="userid" value="<? echo $session->userid; ?>"/>
   <input type="submit" name="submit" id="submit" value=" Submit "/>
</form>

Answer 1

I would argue that this would be a good use case for regular expressions .

For your particular scenario, you can capture both numbers in one execution. You just need to use the preg_match function.

if (preg_match("/(?:.*)artist_([0-9]*)\?(?:.*)song_ids]=([0-9]*)/i", $code, $matches)) {
    print 'artist: ' . $matches[1] . '<br />';
    print 'song: ' . $matches[2];
}

This works with your given code example. It will put the artist number in $matches[1] and the song number in $matches[2] .

I'm comfortable directly referencing these in an if statement because the regular expression has two capturing groups, so there will always be 3 indexes in the $matches array if preg_match returns true . If you make a direct call to preg_match outside of an if statement, you will want to loop through the $matches array to avoid an undefined index error.