how to call the function once at a time? [closed] - php

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I'm working on my PHP script to call the function once at a time when I click the link on my site.
When I click the link on my site to connect to the get-listing.php script, it will call to both function of tvguidecom and skyuk at the same time which it will output one of those webpage.
I think the problem are on this line:
while ($row = mysql_fetch_array($result1))
{
tvguidecom($row);
skyuk($row);
}
Here is the full code:
<?php
$errmsg_arr = array();
$errflag = false;
$link;
include ('simple_html_dom.php');
function db_connect()
{
define('DB_HOST', 'localhost');
define('DB_USER', 'mydbname');
define('DB_PASSWORD', 'mydbpassword');
define('DB_DATABASE', 'mydbname');
$errmsg_arr = array();
$errflag = false;
$link = mysql_connect(DB_HOST, DB_USER, DB_PASSWORD);
if(!$link)
{
die('Failed to connect to server: ' . mysql_error());
}
$db = mysql_select_db(DB_DATABASE);
if(!$db)
{
die("Unable to select database");
}
}
function tvguidecom($row)
{
include ('tvguide.get-listing.php');
}
function tvguide2($row)
{
include ('skyuk.php');
}
db_connect();
function clean($var)
{
return mysql_real_escape_string(strip_tags($var));
}
$channels = "";
$id = "";
if(isset($_GET['channels']))
{
$channels = $_GET['channels'];
}
if(isset($_GET['id']))
{
$id = $_GET['id'];
}
if($errflag)
{
$_SESSION['ERRMSG_ARR'] = $errmsg_arr;
echo implode('<br />',$errmsg_arr);
}
else
{
$insert = array();
if(isset($_GET['channels']))
{
$insert[] = 'channels = \'' . clean($_GET['channels']) .'\'';
}
if(isset($_GET['id']))
{
$insert[] = 'id = \'' . clean($_GET['id']) . '\'';
}
if($channels && $id)
{
$qrytable1="SELECT id, channels, links FROM tvguide WHERE channels='$channels' && id='$id'";
$result1=mysql_query($qrytable1) or die('Error:<br />' . $qry . '<br />' . mysql_error());
while ($row = mysql_fetch_array($result1))
{
tvguidecom($row);
skyuk($row);
}
mysql_close();
exit;
}
else if(!$channels && ! $id)
{
$qrytable1="SELECT id, channels, links, streams FROM tvguide";
$result1=mysql_query($qrytable1) or die('Error:<br />' . $qry . '<br />' . mysql_error());
while ($row = mysql_fetch_array($result1))
{
echo "<p id='channels'>".$row["id"]. " " . $row["channels"]. "</p>";
echo '<a id="link1" href="http://example.com/get-listing.php?channels=' . $row["channels"] . "&id=" . $row["id"] . '">http://example.com/get-listing.php?channels=' . $row["channels"] . "&id=" . $row["id"] . '</a><br><br>';
//echo "<p id='links'>";
//echo '<a id="link1" href="http://example.com/get-listing.php?channels=' . $row["channels"] . "&id=" . $row["id"] . "'>http://example.com/get-listing.php?channels=" . $row["channels"] . "&id=" . $row["id"] .'>test</a></p>';
//echo '<a id="link1" href="http://example.com/get-listing.php?channels=';
echo '<a id="streams" href="' . $row['streams'] . '">Stream 1</a><br><br>';
}
}
}
?>
I want to call either of function once at a time when I click the link on my site. Example: I want to call tvguidecom function to see if it will output the data in my get-listing script or else move on to the next function and call the skyuk function.
Can you please show me an example of how I can call the function once at a time when I click the link on my site?

Answer 1

The best thing you can do is having your functions returning a boolean so you can check if you should continue the process.
I guess the function tvguidecom looks like:
function tvguidecom() {
// do something without return value
}
Add a return value in it:
function tvguidecom() {
// do something
return $status;
}
So in your code you can test for the return value
while ($row = mysql_fetch_array($result1))
{
if (tvguidecom($row)) {
skyuk($row);
}
}
Note: on a different topic, you shouldn't use anymore mysql extension because it is deprecated. You should use instead mysqli or pdo.

Answer 2

TL;DR
while ($row = mysql_fetch_array($result1))
{
// this ensures that `tvguidecom()` does its stuff, and `skyuk()`
// waits for results returned by the function.
skyuk(tvguidecom($row));
}
function tvguidecom($row) {
// do stuffs, returns original input $row;
return $row;
}
** Another approach, callbacks.**
while ($row = mysql_fetch_array($result1))
{
tvguidecom($row, callback);
}
and fn:
tvguidecom(a, callback) {
// dostuffs and when complete
callback( result );
}
** syntax may be incorrect, refer to link supplied. Hope this helps.