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diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -83,6 +83,7 @@
'ArcanistDifferentialDependencyGraph' => 'differential/ArcanistDifferentialDependencyGraph.php',
'ArcanistDifferentialRevisionHash' => 'differential/constants/ArcanistDifferentialRevisionHash.php',
'ArcanistDifferentialRevisionStatus' => 'differential/constants/ArcanistDifferentialRevisionStatus.php',
+ 'ArcanistDirMagicConstantXHPASTLinterRule' => 'lint/linter/xhpast/rules/ArcanistDirMagicConstantXHPASTLinterRule.php',
'ArcanistDoubleQuoteXHPASTLinterRule' => 'lint/linter/xhpast/rules/ArcanistDoubleQuoteXHPASTLinterRule.php',
'ArcanistDownloadWorkflow' => 'workflow/ArcanistDownloadWorkflow.php',
'ArcanistDuplicateKeysInArrayXHPASTLinterRule' => 'lint/linter/xhpast/rules/ArcanistDuplicateKeysInArrayXHPASTLinterRule.php',
@@ -366,6 +367,7 @@
'ArcanistDifferentialDependencyGraph' => 'AbstractDirectedGraph',
'ArcanistDifferentialRevisionHash' => 'Phobject',
'ArcanistDifferentialRevisionStatus' => 'Phobject',
+ 'ArcanistDirMagicConstantXHPASTLinterRule' => 'ArcanistXHPASTLinterRule',
'ArcanistDoubleQuoteXHPASTLinterRule' => 'ArcanistXHPASTLinterRule',
'ArcanistDownloadWorkflow' => 'ArcanistWorkflow',
'ArcanistDuplicateKeysInArrayXHPASTLinterRule' => 'ArcanistXHPASTLinterRule',
diff --git a/src/lint/linter/__tests__/xhpast/dirname-file.lint-test b/src/lint/linter/__tests__/xhpast/dirname-file.lint-test
new file mode 100644
--- /dev/null
+++ b/src/lint/linter/__tests__/xhpast/dirname-file.lint-test
@@ -0,0 +1,20 @@
+<?php
+echo dirname(__FILE__);
+echo dirname(dirname(__FILE__));
+echo __FILE__;
+echo __DIR__;
+echo dirname(__file__);
+~~~~~~~~~~
+advice:2:6
+advice:3:14
+advice:6:6
+warning:6:14
+~~~~~~~~~~
+<?php
+echo __DIR__;
+echo dirname(__DIR__);
+echo __FILE__;
+echo __DIR__;
+echo __DIR__;
+~~~~~~~~~~
+{"config": {"xhpast.php-version": "5.4.0"}}
diff --git a/src/lint/linter/xhpast/rules/ArcanistDirMagicConstantXHPASTLinterRule.php b/src/lint/linter/xhpast/rules/ArcanistDirMagicConstantXHPASTLinterRule.php
new file mode 100644
--- /dev/null
+++ b/src/lint/linter/xhpast/rules/ArcanistDirMagicConstantXHPASTLinterRule.php
@@ -0,0 +1,57 @@
+<?php
+
+final class ArcanistDirMagicConstantXHPASTLinterRule
+ extends ArcanistXHPASTLinterRule {
+
+ const ID = 81;
+
+ public function getLintName() {
+ return pht('%s Usage', 'dirname(__FILE__)');
+ }
+
+ public function getLintSeverity() {
+ return ArcanistLintSeverity::SEVERITY_ADVICE;
+ }
+
+ /**
+ * Lints for the usage of `dirname(__FILE__)`.
+ *
+ * The `__DIR__` magic constant has been available since PHP 5.3. Prior to
+ * this PHP version, `dirname(__FILE__)` was used to refer to the directory
+ * of the current file. In modern versions of PHP, `__DIR__` should always be
+ * used instead of `dirname(__FILE__)`.
+ *
+ * @param XHPASTNode The root node.
+ * @return void
+ */
+ public function process(XHPASTNode $root) {
+ if (version_compare('5.4.0', $this->version, '<')) {
+ continue;
+ }
+
+ $function_calls = $this->getFunctionCalls($root, array('dirname'));
+
+ foreach ($function_calls as $function_call) {
+ $args = $function_call->getChildOfType(1, 'n_CALL_PARAMETER_LIST');
+
+ if (count($args->getChildren()) != 1) {
+ continue;
+ }
+
+ $arg = $args->getChildByIndex(0);
+
+ if ($arg->getTypeName() == 'n_MAGIC_SCALAR' &&
+ strtoupper($arg->getSemanticString()) == '__FILE__') {
+
+ $this->raiseLintAtNode(
+ $function_call,
+ pht(
+ 'Use `%s` instead of `%s`.',
+ '__DIR__',
+ 'dirname(__FILE__)'),
+ '__DIR__');
+ }
+ }
+ }
+
+}

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