在文本框中显示mySQL结果

Question

I am trying to select the user email from a mySQL database, and then display the result in a textbox. However, I get an error message: htmlentities() expects parameter 1 to be string, array given

<?php

    if(!isset($_SESSION)){
        session_start();
    }

    include "config.php";

    $q = "SELECT email FROM users WHERE id ='" . $_SESSION['id'] . "'";
    $result = $sql->query($q);
    $user_email = $result->fetch_assoc();

    $link->close();

?>

    <input class="form" type="text" name="email" value="<?php echo html entities($user_email); ?>" />

What am I doing wrong?

Answer 1

Because your result is an array and not a string. what you can do:

<?php

    if(!isset($_SESSION)){
        session_start();
    }

    include "config.php";

    $q = "SELECT email FROM users WHERE id ='" . $_SESSION['id'] . "'";
    $result = $sql->query($q);
    $user_email = $result->fetch_assoc();

    $resultText = '';
    $glue = '</br>' . PHP_EOL;
    foreach($user_email as $email) {
        $resultText .= $email . $glue;
    }

    $link->close();

?>

    <input class="form" type="text" name="email" value="<?php echo htmlentities($resultText); ?>" />

Answer 2

fetch_assoc returns the row.

try:

$user_email['enter_the_mysql_field_name_here']