added show_source() signature, a alias of highlight_file()

Author: clxmstaab

src/Type/Php/VarExportFunctionDynamicReturnTypeExtension.php

@@ -25,6 +25,7 @@ public function isFunctionSupported(FunctionReflection $functionReflection): boo
 			[
 				'var_export',
 				'highlight_file',
+				'show_source', // alias of highlight_file
 				'highlight_string',
 				'print_r',
 			],

tests/PHPStan/Analyser/LegacyNodeScopeResolverTest.php

@@ -2663,6 +2663,22 @@ public function dataBinaryOperations(): array
 				'string',
 				'highlight_file($string, true)',
 			],
+			[
+				'bool|string',
+				'show_source()',
+			],
+			[
+				'bool',
+				'show_source($string)',
+			],
+			[
+				'bool',
+				'show_source($string, false)',
+			],
+			[
+				'string',
+				'show_source($string, true)',
+			],
 			[
 				'string|true',
 				'print_r()',