Fully qualify the \extention_loaded('sodium') check

This allows OPcache to elide the condition at compile-time if it knows that
ext/sodium is or is not available.

Author: TimWolla

src/Base64.php

@@ -53,7 +53,7 @@ public static function encode(
         #[\SensitiveParameter]
         string $binString
     ): string {
-        if (extension_loaded('sodium')) {
+        if (\extension_loaded('sodium')) {
             $variant = match(static::class) {
                 Base64::class => SODIUM_BASE64_VARIANT_ORIGINAL,
                 Base64UrlSafe::class => SODIUM_BASE64_VARIANT_URLSAFE,
@@ -85,7 +85,7 @@ public static function encodeUnpadded(
         #[\SensitiveParameter]
         string $src
     ): string {
-        if (extension_loaded('sodium')) {
+        if (\extension_loaded('sodium')) {
             $variant = match(static::class) {
                 Base64::class => SODIUM_BASE64_VARIANT_ORIGINAL_NO_PADDING,
                 Base64UrlSafe::class => SODIUM_BASE64_VARIANT_URLSAFE_NO_PADDING,
@@ -199,7 +199,7 @@ public static function decode(
                     'Incorrect padding'
                 );
             }
-            if (extension_loaded('sodium')) {
+            if (\extension_loaded('sodium')) {
                 $variant = match(static::class) {
                     Base64::class => SODIUM_BASE64_VARIANT_ORIGINAL_NO_PADDING,
                     Base64UrlSafe::class => SODIUM_BASE64_VARIANT_URLSAFE_NO_PADDING,

src/Hex.php

@@ -48,7 +48,7 @@ public static function encode(
         #[\SensitiveParameter]
         string $binString
     ): string {
-        if (extension_loaded('sodium')) {
+        if (\extension_loaded('sodium')) {
             try {
                 return sodium_bin2hex($binString);
             } catch (SodiumException $ex) {
@@ -117,7 +117,7 @@ public static function decode(
         string $encodedString,
         bool $strictPadding = false
     ): string {
-        if (extension_loaded('sodium') && $strictPadding) {
+        if (\extension_loaded('sodium') && $strictPadding) {
             try {
                 return sodium_hex2bin($encodedString);
             } catch (SodiumException $ex) {