minor #21537 Static code analysis with Php Inspections (EA Extended) (kalessil)

This PR was squashed before being merged into the 2.7 branch (closes #21537).

Discussion
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Static code analysis with Php Inspections (EA Extended)

| Q             | A
| ------------- | ---
| Branch?       | 2.7
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | --
| License       | MIT
| Doc PR        | --

- Unnecessary proxy methods and methods duplicating  parents ones removed;
- Type casings instead of PHP4 functions;
- Usage of copy instead of file combining file get/put contents;
- One time use variables cleaned up;
- Superfluous functions calls in loop termination conditions fixed;

Commits
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3feeca74d0 Static code analysis with Php Inspections (EA Extended)

Author: fabpot

Tests/CrossCheckTest.php

@@ -36,7 +36,7 @@ public function testCrossCheck($fixture, $type)
 
         $tmp = tempnam(sys_get_temp_dir(), 'sf');
 
-        file_put_contents($tmp, file_get_contents(self::$fixturesPath.'/'.$type.'/'.$fixture));
+        copy(self::$fixturesPath.'/'.$type.'/'.$fixture, $tmp);
 
         $container1 = new ContainerBuilder();
         $loader1 = new $loaderClass($container1, new FileLocator());