How to pass value in php - php

Question

In my home page, I have a search bar with a button at the top of my page and I displayed all my songs using their title from my database underneath that.
The search bar is working fine since every song title I typed, it took me to the correct detail page.
I'm just wondering how can I also click on the song title and take me to each song detail page.
Home page
<?php
require_once '../config.php';
$sql = 'SELECT title FROM song ORDER BY title ASC;';
$stmt = $conn->prepare($sql);
$stmt->execute(['title' => $title]);
// fetch all rows
$songTitle = $stmt->fetchAll(PDO::FETCH_ASSOC);
?>
//Search bar
<form action="chord/details.php" method="post" class="p-3">
<div class="input-group">
<input type="text" name="search" id="search" class="form-control form-control-lg rounded-0 border-primary width =250px;" placeholder="Search..." autocomplete="off" required>
<div class="input-group-append">
<input type="submit" name="submit" value="Search" class="btn btn-primary rounded-right">
</div>
</div>
</form>
// Here I display all my songs from the database using their title
<?php
foreach ($songTitle as $song) {
// I'm not sure how to modify here.
echo "<a href='chord/details.php'>{$song['title']} <br> </a>";
} ?>
Details page
//This is working fine with Search Bar
<?php
require_once '../config.php';
if (isset($_POST['submit'])) {
$title = $_POST['search'];
$sql = 'SELECT * FROM song WHERE title = :title';
$stmt = $conn->prepare($sql);
$stmt->execute(['title' => $title]);
$row = $stmt->fetch();
} else {
header('location: .');
exit();
}
?>
//Display the song lyrics here
<div>Original Key: <?= ucfirst($row['chord']) ?></div><br>
<pre data-key=<?= ucfirst($row['chord']) ?> id="pre">
<?= ucfirst($row['lyrics']) ?>
</pre>

Answer 1

You can use the get HTTP method to send the id of the song to the details.php page and query to the database on that id.
And it's always a good practice to use the GET HTTP method for searching actions. As mickmackusa said in the comment:
$_POST is most appropriate when "writing" data server-side. $_GET is
most appropriate when "reading" data server-side.
So change the code on the Home page as below:
<?php
require_once '../config.php';
// query changed to fetch id as well
$sql = 'SELECT id , title FROM song ORDER BY title ASC;';
$stmt = $conn->prepare($sql);
$stmt->execute(['title' => $title]);
// fetch all rows
$songTitle = $stmt->fetchAll(PDO::FETCH_ASSOC);
?>
<!-- here we change the method to get -->
<form action="chord/details.php" method="get" class="p-3">
<div class="input-group">
<input type="text" name="search" id="search" class="form-control form-control-lg rounded-0 border-primary width =250px;" placeholder="Search..." autocomplete="off" required>
<div class="input-group-append">
<input type="submit" name="submit" value="Search" class="btn btn-primary rounded-right">
</div>
</div>
</form>
<?php
foreach ($songTitle as $song) {
// we add the id to the link
echo "<a href='chord/details.php?id={$song['id']}'>{$song['title']} <br> </a>";
}
?>
And change the detail.php like below:
<?PHP
//This is working fine with Search Bar
require_once '../config.php';
if (isset($_GET['search']) OR isset($_GET['id'])) {
$condition = "";
$value = "";
if (!empty($_GET['id'])) {
$condition = "id = :value";
$value = $_GET['id'];
}
elseif (!empty($_GET['search'])) {
$condition = "title = :value";
$value = $_GET['search'];
}
$sql = 'SELECT * FROM song WHERE ' . $condition;
$stmt = $conn->prepare($sql);
$stmt->execute(['value' => $value]);
$row = $stmt->fetch();
} else {
header('location: .');
exit();
}
?>
//Display the song lyrics here
<div>Original Key: <?= ucfirst($row['chord']) ?></div><br>
<pre data-key=<?= ucfirst($row['chord']) ?> id="pre">
<?= ucfirst($row['lyrics']) ?>
</pre>
It's also a good idea to use LIKE for searching in the title like below:
if (!empty($_POST['search'])) {
$condition = "title LIKE :value";
$value = "%" . $_POST['search'] . "%";
}

Answer 2

Assuming you have an id column in the song table. You could do something like this:
<?php
require_once '../config.php';
$sql = 'SELECT id, title FROM song ORDER BY title ASC;';
$stmt = $conn->prepare($sql);
$stmt->execute();
// fetch all rows
$songTitle = $stmt->fetchAll(PDO::FETCH_ASSOC);
?>
//Search bar
<form action="chord/details.php" method="post" class="p-3">
<div class="input-group">
<input type="text" name="search" id="search" class="form-control form-control-lg rounded-0 border-primary width =250px;" placeholder="Search..." autocomplete="off" required>
<div class="input-group-append">
<input type="submit" name="submit" value="Search" class="btn btn-primary rounded-right">
</div>
</div>
</form>
// Here I display all my songs from the database using their title
<?php
foreach ($songTitle as $song) {
// I'm not sure how to modify here.
echo "<a href='chord/details.php?id=".$song['id]."'>{$song['title']} <br> </a>";
} ?>
Details page
//This is working fine with Search Bar
<?php
require_once '../config.php';
if (isset($_POST['submit'])) {
$title = $_POST['search'];
$sql = 'SELECT * FROM song WHERE title = :title';
$stmt = $conn->prepare($sql);
$stmt->execute(['title' => $title]);
$row = $stmt->fetch();
} elseif (!empty($_REQUEST['id'])) {
$sql = 'SELECT * FROM song WHERE id = :id';
$stmt = $conn->prepare($sql);
$stmt->execute(['id' => $_REQUEST['id']]);
$row = $stmt->fetch();
} else {
header('location: .');
exit();
}
?>
//Display the song lyrics here
<div>Original Key: <?= ucfirst($row['chord']) ?></div><br>
<pre data-key=<?= ucfirst($row['chord']) ?> id="pre">
<?= ucfirst($row['lyrics']) ?>
</pre>