html - next and previous buttons using php -
this question exact duplicate of:
- implementing next , buttons slideshow 2 answers
i'm reposting question because got 1 answer didn't work or @ all. i'm trying make php slideshow , i'm done need implement next , buttons thought going easy, apparently can't increment indexes in php?
$sql = "select pic_url pic_info"; $result = $conn->query($sql); $count = 0; $dir = "http://dev2.matrix.msu.edu/~matrix.training/holmberg_dane/"; $source = "gallery.php"; if ($result->num_rows > 0) { // output data of each row $pic_array = array(); while ($row = $result->fetch_assoc()) { $pic_array[$count] = $row['pic_url']; $count++; } $index = 1; echo "<img src= ' $dir$pic_array[$index]' />"; echo "<a href= '$dir$pic_array[$index + 1]'>next</a>"; echo "<a href= '$dir$pic_array[$index - 1]'>back</a>"; } $conn->close(); ?>
this code destined break. incrementing index means work array items 1 next last before runs key doesn't exist. however, can see trying do, need use concatenation, period in php, , remember not mix double , single quotes. should work you.
echo "<img src= ".$dir.$pic_array[$index]." />"; echo "<a href= ".$dir.$pic_array[$index + 1].">next</a>"; echo "<a href= ".$dir.$pic_array[$index - 1].">back</a>"; 