Reorganize PHP extension requirements in composer.json (#49)

Author: SmetDenis

composer.json

@@ -48,11 +48,7 @@
     ],
 
     "require"           : {
-        "php"        : "^8.1",
-        "ext-posix"  : "*",
-        "ext-filter" : "*",
-        "ext-dom"    : "*",
-        "ext-gd"     : "*"
+        "php" : "^8.1"
     },
 
     "require-dev"       : {
@@ -66,7 +62,11 @@
         "symfony/process"           : "For Cli::exec() method only",
         "symfony/polyfill-mbstring" : "For UTF-8 if ext-mbstring disabled",
         "jbzoo/data"                : ">=4.0",
-        "ext-intl"                  : "*"
+        "ext-intl"                  : "*",
+        "ext-posix"                 : "*",
+        "ext-filter"                : "*",
+        "ext-dom"                   : "*",
+        "ext-gd"                    : "*"
     },
 
     "autoload"          : {

src/Xml.php

@@ -50,8 +50,8 @@ public static function createFromString(?string $source = null, bool $preserveWh
 
         $document->preserveWhiteSpace = $preserveWhiteSpace;
 
-        if (!isStrEmpty($source)) {
-            $document->loadXML($source ?? '');
+        if ($source !== '' && $source !== null) {
+            $document->loadXML($source);
         }
 
         $document->xmlVersion   = self::VERSION;