Echo a variable inside a variable

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I’m trying to figure out how to echo a variable inside a variable.

This code below doesn’t obviously work because I’m not echoing the variable

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$tweet = get_field('tweet_msg'); //this is getting the string inputted by user in the custom field
$tweet_intent = '<div><a href="https://twitter.com/intent/tweet?text="'.$tweet.'">TEST</a> </div>';

but when ever I do PHP throws an error saying unexpected echo: 

$tweet_intent = '<div style="margin-bottom:15px;"><a href="https://twitter.com/intent/tweet?text="'.echo $tweet.'">TEST</a> </div>';

Full code: 

add_filter( 'the_content', 'prefix_insert_post_ads' );

function prefix_insert_post_ads( $content ) {
  $tweet = get_field('tweet_msg');
  $tweet_intent = '<div style="margin-bottom:15px;"><a href="https://twitter.com/intent/tweet?text="'.$tweet.'">TEST</a> </div>';

  if ( is_single() && ! is_admin() ) {
    return prefix_insert_after_paragraph( $tweet_intent, 2, $content );
  }

  return $content;
}

// Parent Function that makes the magic happen

function prefix_insert_after_paragraph( $insertion, $paragraph_id, $content ) {
  $closing_p = '</p>';
  $paragraphs = explode( $closing_p, $content );
  foreach ($paragraphs as $index => $paragraph) {

    if ( trim( $paragraph ) ) {        $paragraphs[$index] .= $closing_p;
    }
    if ( $paragraph_id == $index + 1 ) {
      $paragraphs[$index] .= $insertion;
    }
  }     return implode( '', $paragraphs );
}
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1 comment

  1. The problem reside in your <a href> syntax.
    Assuming that, after get_field(), the value of $tweet is ‘Hello-World’, your code:

    $tweet_intent = '<div style="margin-bottom:15px;"><a href="https://twitter.com/intent/tweet?text="'.$tweet.'">TEST</a> </div>';

    put in $tweet_intent this string:

    (...)<a href="https://twitter.com/intent/tweet?text="Hello-World">TEST</a> </div>
             └──────────────────────────────────────┘

    As you can see, the quotation marks of href are closed before $tweet output.

    You have to change your code in this way:

    $tweet = get_field( 'tweet_msg' );
$tweet = rawurlencode( $tweet ); // only if encoding is not performed by get_field 
$tweet_intent = '
    <div style="margin-bottom:15px;">
         <a href="https://twitter.com/intent/tweet?text='.$tweet.'">TEST</a>
    </div>';

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