if output is empty do something else? - php

Question

This code outputs info from a road. but sometimes there is no info, then I want to gather info from another place. How can I do this?
$title = '1234';
foreach(Feed('$url') as $f ) {
if (strpos($f->title, $title) !== false){
$pos = $f->children('georss', true)->children('gml', true)->children('gml', true);
list($number1, $number2) = explode(' ', $pos);
if ($number1 > 0 && $number1 < 100){
if ($number2 > 1 && $number2 < 10){
echo $f->description. "<br>";
}
}
}
}
how can I make it so if this^^ has no results then do this:
foreach(Feed('$url') as $f ) {
if (strpos($f->title, $title) !== false){
echo $f->description. "<br>";
}
}
I know I can check if a variable is empty with using Len($variable) = 0. but i dont have an variable. how could i get this? then i guess i could do:
if (Len($variable) = 0) {
foreach(Feed('$url') as $g ) {
if (strpos($g->title, $title) !== false){
echo $g->description. "<br>";
}
}
}
I guess it is possible to have foreach inside if?
Any help is greatly appreciated!

Answer 1

You could use a boolean variable to indicate if you found the description the first way, and if not, then find it the second way:
$descriptionFound = false;
foreach(Feed('https://www.vegvesen.no/trafikk/xml/savedsearch.rss?id=601') as $f) {
if (strpos($f->title, $title) !== false){
$pos = $f->children('georss', true)->children('gml', true)->children('gml', true);
list($number1, $number2) = explode(' ', $pos);
if (
$number1 > 59.417104 && $number1 < 60.089568
&& $number2 > 5.115812 && $number2 < 7.811784
) {
$descriptionFound = true;
echo $f->description . "<br>";
}
}
}
if (!$descriptionFound) {
foreach(Feed('https://www.vegvesen.no/trafikk/xml/savedsearch.rss?id=604') as $f) {
if (strpos($f->title, $title) !== false){
echo $f->description . "<br>";
}
}
}
Similarly, you could store the description as you're checking various methods, and then output the value at the end:
$description = '';
foreach(Feed('https://www.vegvesen.no/trafikk/xml/savedsearch.rss?id=601') as $f) {
if (strpos($f->title, $title) !== false){
$pos = $f->children('georss', true)->children('gml', true)->children('gml', true);
list($number1, $number2) = explode(' ', $pos);
if (
$number1 > 59.417104 && $number1 < 60.089568
&& $number2 > 5.115812 && $number2 < 7.811784
) {
$description .= $f->description . "<br>";
}
}
}
if (!$description) { //this will be falsy if it's an empty string, so no need to do == ''
foreach(Feed('https://www.vegvesen.no/trafikk/xml/savedsearch.rss?id=604') as $f) {
if (strpos($f->title, $title) !== false){
$description .= $f->description . "<br>";
}
}
}
echo $description;
Either would give you the same code flow and end result.