bug #57497 [String] Fixed u()->snake(), b()->snake() and s()->snake() methods (arczinosek)

This PR was merged into the 5.4 branch.

Discussion
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[String] Fixed u()->snake(), b()->snake() and s()->snake() methods

| Q             | A
| ------------- | ---
| Branch?       | 5.4
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Issues        | Fix #57464
| License       | MIT

[String] ByteString::snake and AbstractUnitcodeString::snake methods doesn't convert all uppercase words in the right way.

For example, string "GREAT SYMFONY" is converted to "greatsymfony" instead of "great_symfony".

Commits
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f93113e80e [String] Fix *String::snake methods

Author: nicolas-grekas

AbstractUnicodeString.php

@@ -366,8 +366,8 @@ public function reverse(): parent
 
     public function snake(): parent
     {
-        $str = $this->camel();
-        $str->string = mb_strtolower(preg_replace(['/(\p{Lu}+)(\p{Lu}\p{Ll})/u', '/([\p{Ll}0-9])(\p{Lu})/u'], '\1_\2', $str->string), 'UTF-8');
+        $str = clone $this;
+        $str->string = str_replace(' ', '_', mb_strtolower(preg_replace(['/(\p{Lu}+)(\p{Lu}\p{Ll})/u', '/([\p{Ll}0-9])(\p{Lu})/u'], '\1 \2', $str->string), 'UTF-8'));
 
         return $str;
     }

ByteString.php

@@ -366,8 +366,8 @@ public function slice(int $start = 0, ?int $length = null): parent
 
     public function snake(): parent
     {
-        $str = $this->camel();
-        $str->string = strtolower(preg_replace(['/([A-Z]+)([A-Z][a-z])/', '/([a-z\d])([A-Z])/'], '\1_\2', $str->string));
+        $str = clone $this;
+        $str->string = str_replace(' ', '_', strtolower(preg_replace(['/([A-Z]+)([A-Z][a-z])/', '/([a-z\d])([A-Z])/'], '\1 \2', $str->string)));
 
         return $str;
     }

Tests/AbstractAsciiTestCase.php

@@ -1077,6 +1077,8 @@ public static function provideSnake()
             ['symfony_is_great', 'symfonyIsGREAT'],
             ['symfony_is_really_great', 'symfonyIsREALLYGreat'],
             ['symfony', 'SYMFONY'],
+            ['symfony_is_great', 'SYMFONY IS GREAT'],
+            ['symfony_is_great', 'SYMFONY_IS_GREAT'],
         ];
     }