[l18n] improvement: use null coalescing operator

Author: connorhu

lib/i18n/sfCultureInfo.class.php

@@ -470,11 +470,7 @@ public function getCountry($code)
     {
         $countries = $this->findInfo('Countries', true);
 
-        if (!isset($countries[$code])) {
-            throw new InvalidArgumentException(sprintf('The country %s does not exist.', $code));
-        }
-
-        return $countries[$code];
+        return $countries[$code] ?? throw new InvalidArgumentException(sprintf('The country %s does not exist.', $code));;
     }
 
     /**
@@ -488,11 +484,7 @@ public function getCurrency($code)
     {
         $currencies = $this->findInfo('Currencies', true);
 
-        if (!isset($currencies[$code])) {
-            throw new InvalidArgumentException(sprintf('The currency %s does not exist.', $code));
-        }
-
-        return $currencies[$code][1];
+        return $currencies[$code][1] ?? throw new InvalidArgumentException(sprintf('The currency %s does not exist.', $code));
     }
 
     /**

lib/i18n/sfDateFormat.class.php

@@ -381,9 +381,7 @@ public function getInputPattern($pattern)
      */
     protected function getFunctionName($token)
     {
-        if (isset($this->tokens[$token[0]])) {
-            return $this->tokens[$token[0]];
-        }
+        return $this->tokens[$token[0]] ?? null;
     }
 
     /**

lib/i18n/sfDateTimeFormatInfo.class.php

@@ -284,11 +284,7 @@ public function setNarrowMonthNames($value)
      */
     public function getAbbreviatedMonthNames()
     {
-        if (isset($this->data['monthNames']['format']['abbreviated'])) {
-            return $this->data['monthNames']['format']['abbreviated'];
-        }
-
-        return $this->data['monthNames']['format']['wide'];
+        return $this->data['monthNames']['format']['abbreviated'] ?? $this->data['monthNames']['format']['wide'];
     }
 
     /**

lib/i18n/sfNumberFormatInfo.class.php

@@ -409,11 +409,7 @@ public function setPositivePattern($pattern)
      */
     public function getCurrencySymbol($currency = 'USD')
     {
-        if (isset($this->pattern['symbol'])) {
-            return $this->pattern['symbol'];
-        }
-
-        return $this->data['Currencies'][$currency][0];
+        return $this->pattern['symbol'] ?? $this->data['Currencies'][$currency][0];
     }
 
     /**