Fully qualify constants and function calls

This should give a small performance boost.
Part of vimeo#1837.

The change is enforced via phpcs and can be autofixed
with phpcbf.

composer.json

@@ -51,7 +51,8 @@
         "bamarni/composer-bin-plugin": "^1.2",
         "psalm/plugin-phpunit": "^0.6",
         "phpmyadmin/sql-parser": "^5.0",
-        "symfony/process": "^4.3"
+        "symfony/process": "^4.3",
+        "slevomat/coding-standard": "^5.0"
     },
     "suggest": {
         "ext-igbinary": "^2.0.5"

phpcs.xml

@@ -1,6 +1,18 @@
 <?xml version="1.0"?>
 <ruleset name="PHP_CodeSniffer">
+    <config name="installed_paths" value="../../slevomat/coding-standard"/>
     <rule ref="PSR2" />
+    <!-- Forbid usage of a function or a class constant via fallback global name -->
+    <rule ref="SlevomatCodingStandard.Namespaces.ReferenceUsedNamesOnly">
+        <properties>
+            <property name="allowFallbackGlobalConstants" type="boolean" value="false"/>
+            <property name="allowFallbackGlobalFunctions" type="boolean" value="false"/>
+            <property name="allowFullyQualifiedGlobalConstants" type="boolean" value="true"/>
+            <property name="allowFullyQualifiedGlobalFunctions" type="boolean" value="true"/>
+            <property name="allowFullyQualifiedGlobalClasses" type="boolean" value="true"/>
+        </properties>
+        <exclude name="SlevomatCodingStandard.Namespaces.ReferenceUsedNamesOnly.ReferenceViaFullyQualifiedName"/>
+    </rule>
 
     <file>bin/</file>
     <file>src/</file>

src/Psalm/CodeLocation.php

@@ -3,6 +3,20 @@
 
 use PhpParser;
 use Psalm\Internal\Analyzer\CommentAnalyzer;
+use function strlen;
+use function strpos;
+use function explode;
+use function substr;
+use function trim;
+use function preg_replace;
+use function str_replace;
+use function preg_quote;
+use function preg_match;
+use const PREG_OFFSET_CAPTURE;
+use function strrpos;
+use function min;
+use function max;
+use function substr_count;
 
 class CodeLocation
 {

src/Psalm/CodeLocation/ParseErrorLocation.php

@@ -2,6 +2,8 @@
 namespace Psalm\CodeLocation;
 
 use PhpParser;
+use function substr_count;
+use function substr;
 
 class ParseErrorLocation extends \Psalm\CodeLocation
 {

src/Psalm/Codebase.php

@@ -17,6 +17,24 @@
 use Psalm\Storage\ClassLikeStorage;
 use Psalm\Storage\FileStorage;
 use Psalm\Storage\FunctionLikeStorage;
+use const PHP_MAJOR_VERSION;
+use const PHP_MINOR_VERSION;
+use function in_array;
+use function array_combine;
+use function strpos;
+use function strtolower;
+use function explode;
+use function array_merge;
+use function substr;
+use function error_log;
+use function ksort;
+use function krsort;
+use function preg_match;
+use function strlen;
+use function count;
+use function array_shift;
+use function substr_count;
+use function strrpos;
 
 class Codebase
 {

src/Psalm/Config.php

@@ -20,6 +20,51 @@
 use Psalm\Progress\Progress;
 use Psalm\Progress\VoidProgress;
 use SimpleXMLElement;
+use const PHP_EOL;
+use function realpath;
+use function is_dir;
+use function dirname;
+use const DIRECTORY_SEPARATOR;
+use function file_exists;
+use function file_get_contents;
+use function sha1;
+use function libxml_use_internal_errors;
+use function libxml_get_errors;
+use const LIBXML_ERR_FATAL;
+use const LIBXML_ERR_ERROR;
+use function libxml_clear_errors;
+use function sys_get_temp_dir;
+use function mkdir;
+use function trigger_error;
+use const E_USER_ERROR;
+use function phpversion;
+use function version_compare;
+use function intval;
+use function strtolower;
+use function preg_replace;
+use function class_exists;
+use function count;
+use function reset;
+use function preg_quote;
+use function in_array;
+use function explode;
+use function get_class;
+use function array_pop;
+use function strpos;
+use function preg_match;
+use function array_merge;
+use function get_defined_constants;
+use function get_defined_functions;
+use function json_decode;
+use function array_unique;
+use function strtr;
+use function strrpos;
+use function substr;
+use function substr_count;
+use function scandir;
+use function filetype;
+use function unlink;
+use function rmdir;
 
 class Config
 {

src/Psalm/Config/Creator.php

@@ -3,6 +3,23 @@
 
 use Psalm\Exception\ConfigCreationException;
 use Psalm\Internal\Provider;
+use function is_dir;
+use const DIRECTORY_SEPARATOR;
+use function file_exists;
+use function json_decode;
+use function file_get_contents;
+use function is_array;
+use function dirname;
+use function str_replace;
+use function implode;
+use function array_merge;
+use function preg_replace;
+use function array_unique;
+use function sort;
+use function glob;
+use function explode;
+use function array_shift;
+use function count;
 
 class Creator
 {

src/Psalm/Config/ErrorLevelFileFilter.php

@@ -2,6 +2,7 @@
 namespace Psalm\Config;
 
 use SimpleXMLElement;
+use function in_array;
 
 class ErrorLevelFileFilter extends FileFilter
 {

src/Psalm/Config/FileFilter.php

@@ -3,6 +3,25 @@
 
 use SimpleXMLElement;
 use Psalm\Exception\ConfigException;
+use function is_bool;
+use function strtolower;
+use const DIRECTORY_SEPARATOR;
+use function strpos;
+use function array_map;
+use function array_filter;
+use function glob;
+use function realpath;
+use function is_dir;
+use function readlink;
+use function stripos;
+use function str_replace;
+use function preg_match;
+use function set_error_handler;
+use const E_WARNING;
+use function restore_error_handler;
+use function preg_replace;
+use function in_array;
+use function explode;
 
 class FileFilter
 {

src/Psalm/Config/IssueHandler.php

@@ -2,6 +2,13 @@
 namespace Psalm\Config;
 
 use SimpleXMLElement;
+use function in_array;
+use function strtolower;
+use function array_filter;
+use function array_map;
+use function substr;
+use function scandir;
+use function dirname;
 
 class IssueHandler
 {

src/Psalm/Config/ProjectFileFilter.php

@@ -2,6 +2,8 @@
 namespace Psalm\Config;
 
 use SimpleXMLElement;
+use function strpos;
+use function stripos;
 
 class ProjectFileFilter extends FileFilter
 {

src/Psalm/Context.php

@@ -8,6 +8,16 @@
 use Psalm\Type\Reconciler;
 use Psalm\Type;
 use Psalm\Type\Union;
+use function in_array;
+use function count;
+use function array_filter;
+use function preg_quote;
+use function preg_match;
+use function strpos;
+use function array_keys;
+use function strtolower;
+use function preg_replace;
+use function json_encode;
 
 class Context
 {

src/Psalm/DocComment.php

@@ -3,6 +3,23 @@
 namespace Psalm;
 
 use Psalm\Exception\DocblockParseException;
+use function trim;
+use function preg_replace;
+use function explode;
+use function preg_match;
+use function rtrim;
+use function str_replace;
+use function implode;
+use function preg_match_all;
+use const PREG_SET_ORDER;
+use function array_filter;
+use function strlen;
+use function min;
+use function str_repeat;
+use function substr;
+use function in_array;
+use const PREG_OFFSET_CAPTURE;
+use function strpos;
 
 class DocComment
 {

src/Psalm/ErrorBaseline.php

@@ -2,6 +2,20 @@
 namespace Psalm;
 
 use Psalm\Internal\Provider\FileProvider;
+use function array_reduce;
+use const LIBXML_NOBLANKS;
+use function str_replace;
+use function min;
+use function array_intersect;
+use function array_filter;
+use function strpos;
+use function ksort;
+use function array_merge;
+use function get_loaded_extensions;
+use function usort;
+use function implode;
+use function phpversion;
+use function array_map;
 
 class ErrorBaseline
 {

src/Psalm/FileBasedPluginAdapter.php

@@ -4,6 +4,7 @@
 use Psalm\Internal\Analyzer\ClassLikeAnalyzer;
 use Psalm\Internal\Scanner\FileScanner;
 use SimpleXMLElement;
+use function reset;
 
 class FileBasedPluginAdapter implements Plugin\PluginEntryPointInterface
 {

src/Psalm/FileManipulation.php

@@ -1,6 +1,12 @@
 <?php
 namespace Psalm;
 
+use function sha1;
+use function strrpos;
+use function strlen;
+use function substr;
+use function trim;
+
 class FileManipulation
 {
     /** @var int */

src/Psalm/Internal/Analyzer/AlgebraAnalyzer.php

@@ -8,6 +8,9 @@
 use Psalm\Issue\RedundantCondition;
 use Psalm\IssueBuffer;
 use Psalm\Type\Algebra;
+use function array_intersect_key;
+use function count;
+use function array_unique;
 
 /**
  * @internal

src/Psalm/Internal/Analyzer/CanAlias.php

@@ -5,6 +5,8 @@
 use Psalm\Aliases;
 use Psalm\CodeLocation;
 use Psalm\Internal\FileManipulation\FileManipulationBuffer;
+use function implode;
+use function strtolower;
 
 trait CanAlias
 {

src/Psalm/Internal/Analyzer/ClassAnalyzer.php

@@ -35,6 +35,20 @@
 use Psalm\Storage\ClassLikeStorage;
 use Psalm\Storage\FunctionLikeParameter;
 use Psalm\Type;
+use function preg_replace;
+use function preg_match;
+use function explode;
+use function array_pop;
+use function array_merge;
+use function strtolower;
+use function implode;
+use function substr;
+use function array_map;
+use function array_shift;
+use function str_replace;
+use function count;
+use function array_search;
+use function array_keys;
 
 /**
  * @internal

src/Psalm/Internal/Analyzer/ClassLikeAnalyzer.php

@@ -17,6 +17,14 @@
 use Psalm\StatementsSource;
 use Psalm\Storage\ClassLikeStorage;
 use Psalm\Type;
+use function strtolower;
+use function preg_replace;
+use function in_array;
+use function preg_match;
+use function explode;
+use function array_pop;
+use function implode;
+use function gettype;
 
 /**
  * @internal

src/Psalm/Internal/Analyzer/CommentAnalyzer.php

@@ -14,6 +14,27 @@
 use Psalm\Internal\Scanner\VarDocblockComment;
 use Psalm\Internal\Type\ParseTree;
 use Psalm\Type;
+use function trim;
+use function substr_count;
+use function strlen;
+use function preg_replace;
+use function str_replace;
+use function preg_match;
+use function count;
+use function reset;
+use function preg_split;
+use const PREG_SPLIT_DELIM_CAPTURE;
+use const PREG_SPLIT_NO_EMPTY;
+use function array_shift;
+use function implode;
+use function substr;
+use function strpos;
+use function strtolower;
+use function in_array;
+use function explode;
+use function array_merge;
+use const PREG_OFFSET_CAPTURE;
+use function rtrim;
 
 /**
  * @internal

src/Psalm/Internal/Analyzer/FileAnalyzer.php

@@ -11,6 +11,14 @@
 use Psalm\IssueBuffer;
 use Psalm\StatementsSource;
 use Psalm\Type;
+use function implode;
+use function strtolower;
+use function explode;
+use function strpos;
+use function array_keys;
+use function count;
+use function array_merge;
+use function array_diff;
 
 /**
  * @internal