Feat: Require comparisons to be strict (fixes #90)

Author: OndraM

ecs.php

@@ -122,6 +122,7 @@
 use PhpCsFixer\Fixer\Semicolon\NoSinglelineWhitespaceBeforeSemicolonsFixer;
 use PhpCsFixer\Fixer\Semicolon\SpaceAfterSemicolonFixer;
 use PhpCsFixer\Fixer\Strict\DeclareStrictTypesFixer;
+use PhpCsFixer\Fixer\Strict\StrictComparisonFixer;
 use PhpCsFixer\Fixer\Strict\StrictParamFixer;
 use PhpCsFixer\Fixer\StringNotation\SingleQuoteFixer;
 use PhpCsFixer\Fixer\Whitespace\BlankLineBeforeStatementFixer;
@@ -358,6 +359,8 @@
             DeclareStrictTypesFixer::class,
             // Functions should be used with `$strict` param set to `true`
             StrictParamFixer::class,
+            // Comparisons should be strict, `===` or `!==` must be used for comparisons
+            StrictComparisonFixer::class,
             // Convert double quotes to single quotes for simple strings
             SingleQuoteFixer::class,
             // Remove extra spaces in a nullable typehint

tests/Integration/Fixtures/Basic.correct.php.inc

@@ -14,8 +14,8 @@ class Basic
         $lambdaWithUnusedImport = function () { return 'foo'; };
         // NoUselessSprintfFixer
         $uselessSprintf = 'bar';
-        // SingleSpaceAfterConstructFixer
-        if ($a == $b) {
+        // SingleSpaceAfterConstructFixer, StrictComparisonFixer
+        if ($a === $b || $bazLength !== 3) {
             return true;
         }
 

tests/Integration/Fixtures/Basic.wrong.php.inc

@@ -13,8 +13,8 @@ class Basic
         $lambdaWithUnusedImport = function () use ($fooBar) { return 'foo'; };
         // NoUselessSprintfFixer
         $uselessSprintf = sprintf('bar');
-        // SingleSpaceAfterConstructFixer
-        if ($a == $b) { return  true; }
+        // SingleSpaceAfterConstructFixer, StrictComparisonFixer
+        if ($a == $b || $bazLength != 3) { return  true; }
         return false; // BlankLineBeforeStatementFixer
     }