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handle division by zero safely

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This commit is contained in:
frederik
2024-04-03 11:13:42 +02:00
parent 4f38aabcea
commit 078d394f9e
1 changed files with 17 additions and 15 deletions
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scripts/weekly_report.php
+17 -15
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@@ -9,6 +9,19 @@ $enddate = strtotime('last sunday') - (1*86400);
$debug = false;
function safe_percentage($count, $prior_count) {
if ($prior_count !== 0) {
$percentagediff = round((($count - $prior_count) / $prior_count) * 100);
} else {
if ($count > 0) {
$percentagediff = INF;
} else {
$percentagediff = 0;
}
}
return $percentagediff;
}
if(isset($_GET['ascii'])) {
$db = new SQLite3('./scripts/birds.db', SQLITE3_OPEN_READONLY);
@@ -38,15 +51,14 @@ if(isset($_GET['ascii'])) {
$result7= $statement7->execute();
$priortotalspeciestally = $result7->fetchArray(SQLITE3_ASSOC)['COUNT(DISTINCT(Com_Name))'];
$percentagedifftotal = round( (($totalcount - $priortotalcount) / $priortotalcount) * 100 );
$percentagedifftotal = safe_percentage($totalcount, $priortotalcount);
if($percentagedifftotal > 0) {
$percentagedifftotal = "<span style='color:green;font-size:small'>+".$percentagedifftotal."%</span>";
} else {
$percentagedifftotal = "<span style='color:red;font-size:small'>-".abs($percentagedifftotal)."%</span>";
}
$percentagedifftotaldistinctspecies = round( (($totalspeciestally - $priortotalspeciestally) / $priortotalspeciestally) * 100 );
$percentagedifftotaldistinctspecies = safe_percentage($totalspeciestally, $priortotalspeciestally);
if($percentagedifftotaldistinctspecies > 0) {
$percentagedifftotaldistinctspecies = "<span style='color:green;font-size:small'>+".$percentagedifftotaldistinctspecies."%</span>";
} else {
@@ -80,9 +92,7 @@ if(isset($_GET['ascii'])) {
$priorweekcount = $totalcount['COUNT(*)'];
// really percent changed
if($priorweekcount > 0){
$percentagediff = round( (($scount - $priorweekcount) / $priorweekcount) * 100 );
$percentagediff = safe_percentage($scount, $priorweekcount);
if($percentagediff > 0) {
$percentagediff = "<span style='color:green;font-size:small'>+".$percentagediff."%</span>";
} else {
@@ -90,9 +100,6 @@ if(isset($_GET['ascii'])) {
}
echo $com_name." - ".$scount." (".$percentagediff.")<br>";
} else {
echo $com_name." - ".$scount ."<br>";
}
}
}
@@ -177,12 +184,7 @@ while($detection=$result1->fetchArray(SQLITE3_ASSOC))
$totalcount = $result2->fetchArray(SQLITE3_ASSOC);
$priorweekcount = $totalcount['COUNT(*)'];
if ($priorweekcount > 0) {
$percentagediff = round( (($scount - $priorweekcount) / $priorweekcount) * 100 );
} else {
$percentagediff = 0;
}
$percentagediff = safe_percentage($scount, $priorweekcount);
if($percentagediff > 0) {
$percentagediff = "<span style='color:green;font-size:small'>+".$percentagediff."%</span>";
} else {