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Editorial Team
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Asked: 2026-05-17T15:12:53+00:00

I have the following code where I declare a PHP array variable and inside

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I have the following code where I declare a PHP array variable and inside a function, I put some data into the array. I also display buttons mapped to each index of the array that will show the data in the PHP array for that index number.

When testing on a browser, I don’t get the right answer. I checked the page source, it had code like data_array = ["<?php echo implode ('',Array); ?>"]; instead of the text from the Array.

What am I doing wrong and what should I do to get the correct output? (BTW, I tried to execute the same without declaring the function and it seemed to work, but I need a function for my work and can’t take that approach).

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
<html lang="en">
    <head>
        <title>Example</title>

        <?php
            $giant_says = array();

            function display()  {
                global $giant_says;

                $giant_says[] = "<a href='http://www.google.com'>Google</a>";
                $giant_says[] = "Yahoo!";
                $giant_says[] = "Bing";

                echo "<div id='content'>";
                echo $giant_says[0];
                echo "</div><br><br>";

                $i = 0;
                while($i < count($giant_says))  {
                    echo "<input type='button' value='".$i."' onClick=\"addtext(".$i.");return false;\"";
                    $i += 1;
                }
            }
        ?>

        <script type="text/javascript">
          function addtext(index) {
              giantSays = ["<?php echo implode ('","', $giant_says); ?>"];
              document.getElementById('content').innerHTML = giantSays[index];
          }
        </script>
    </head>

    <body>
        <?php
            display();
        ?>
    </body>
</html>
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1 Answer

  1. Editorial Team

    You have the order wrong, which is causing the implode() to compress an empty array. I also suggest using json_encode() instead of implode(). It exists for this type of thing – updated example below:

    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
<html lang="en">
<head>

  <title>Example</title>

  <?php

  $giant_says = array();

  function display(&$giant_says)  {

    // Calculate the array (referenced)

    $giant_says[] = "<a href='http://www.google.com'>Google</a>";
    $giant_says[] = "Yahoo!";
    $giant_says[] = "Bing";

    // Return the HTML, to display later

    ob_start();

    echo "<div id='content'>";
    echo $giant_says[0];
    echo "</div><br><br>";

    $i = 0;
    while($i < count($giant_says))  {
      echo "<input type='button' value='".$i."' onClick=\"addtext(".$i.");return false;\">";
      $i += 1;
    }
    $Return = ob_get_contents();
    ob_end_clean();
    return $Return;
  }

  $Display = display($giant_says);

  ?>

  <script type="text/javascript">
    function addtext(index) {
        giantSays = <?php echo json_encode($giant_says); ?>;
      document.getElementById('content').innerHTML = giantSays[index];
    }
  </script>

</head>

<body>

  <?php
    echo $Display;
  ?>

</body>
</html>
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