use sprintf instead of concatenating

lib/Providers/Qr/GoogleChartsQrCodeProvider.php

@@ -23,11 +23,12 @@ class GoogleChartsQrCodeProvider extends BaseHTTPQRCodeProvider
 
     public function getUrl(string $qrtext, int $size): string
     {
-        return 'https://chart.googleapis.com/chart'
-            . '?chs=' . $size . 'x' . $size
-            . '&chld=' . urlencode(strtoupper($this->errorcorrectionlevel) . '|' . $this->margin)
-            . '&cht=' . 'qr'
-            . '&choe=' . $this->encoding
-            . '&chl=' . rawurlencode($qrtext);
+        return sprintf(
+            'https://chart.googleapis.com/chart?chs=%1$sx%1$s&chld=%2$s&cht=qr&choe=%3$s&chl=%4$s',
+            $size,
+            urlencode(strtoupper($this->errorcorrectionlevel) . '|' . $this->margin),
+            $this->encoding,
+            rawurlencode($qrtext)
+        );
     }
 }

lib/Providers/Qr/ImageChartsQRCodeProvider.php

@@ -25,9 +25,12 @@ class ImageChartsQRCodeProvider extends BaseHTTPQRCodeProvider
 
     public function getUrl(string $qrtext, int $size): string
     {
-        return 'https://image-charts.com/chart?cht=qr'
-            . '&chs=' . ceil($size / 2) . 'x' . ceil($size / 2)
-            . '&chld=' . $this->errorcorrectionlevel . '|' . $this->margin
-            . '&chl=' . rawurlencode($qrtext);
+        return sprintf(
+            'https://image-charts.com/chart?cht=qr&chs=%1$dx%1$d&chld=%2$s|%3$s&chl=%4$s',
+            ceil($size / 2),
+            $this->errorcorrectionlevel,
+            $this->margin,
+            rawurlencode($qrtext)
+        );
     }
 }

lib/Providers/Qr/QRServerProvider.php

@@ -38,15 +38,17 @@ class QRServerProvider extends BaseHTTPQRCodeProvider
 
     public function getUrl(string $qrtext, int $size): string
     {
-        return 'https://api.qrserver.com/v1/create-qr-code/'
-            . '?size=' . $size . 'x' . $size
-            . '&ecc=' . strtoupper($this->errorcorrectionlevel)
-            . '&margin=' . $this->margin
-            . '&qzone=' . $this->qzone
-            . '&bgcolor=' . $this->decodeColor($this->bgcolor)
-            . '&color=' . $this->decodeColor($this->color)
-            . '&format=' . strtolower($this->format)
-            . '&data=' . rawurlencode($qrtext);
+        return sprintf(
+            'https://api.qrserver.com/v1/create-qr-code/?size=%1$sx%1$s&ecc=%2$s&margin=%3$s&qzone=%4$s&bgcolor=%5$s&color=%6$s&format=%7$s&data=%8$s',
+            $size,
+            strtoupper($this->errorcorrectionlevel),
+            $this->margin,
+            $this->qzone,
+            $this->decodeColor($this->bgcolor),
+            $this->decodeColor($this->color),
+            strtolower($this->format),
+            rawurlencode($qrtext)
+        );
     }
 
     private function decodeColor(string $value): string

lib/Providers/Qr/QRicketProvider.php

@@ -34,12 +34,14 @@ class QRicketProvider extends BaseHTTPQRCodeProvider
 
     public function getUrl(string $qrtext, int $size): string
     {
-        return 'http://qrickit.com/api/qr'
-            . '?qrsize=' . $size
-            . '&e=' . strtolower($this->errorcorrectionlevel)
-            . '&bgdcolor=' . $this->bgcolor
-            . '&fgdcolor=' . $this->color
-            . '&t=' . strtolower($this->format)
-            . '&d=' . rawurlencode($qrtext);
+        return sprintf(
+            'http://qrickit.com/api/qr?qrsize=%s&e=%s&bgdcolor=%s&fgdcolor=%s&t=%s&d=%s',
+            $size,
+            strtolower($this->errorcorrectionlevel),
+            $this->bgcolor,
+            $this->color,
+            strtolower($this->format),
+            rawurlencode($qrtext)
+        );
     }
 }