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qa-tool/htdocs/oidc/phpseclib/Common/ConstantUtilityTrait.php

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+<?php
+
+declare(strict_types=1);
+
+namespace phpseclib3\Common;
+
+use phpseclib3\Exception\InvalidArgumentException;
+
+/**
+ * @internal
+ */
+trait ConstantUtilityTrait
+{
+    /** @var string[]|null */
+    private static $valueToConstantNameMap = null;
+
+    /**
+     * @param string|int $value
+     */
+    public static function findConstantNameByValue($value): ?string
+    {
+        if (!self::$valueToConstantNameMap) {
+            $reflectionClass = new \ReflectionClass(static::class);
+            $constantNameToValueMap = $reflectionClass->getConstants();
+            self::$valueToConstantNameMap = array_flip($constantNameToValueMap);
+        }
+        if (isset(self::$valueToConstantNameMap[$value])) {
+            return self::$valueToConstantNameMap[$value];
+        }
+        return null;
+    }
+
+    /**
+     * @param string|int $value
+     */
+    public static function getConstantNameByValue($value): string
+    {
+        $constantName = static::findConstantNameByValue($value);
+        if ($constantName === null) {
+            throw new InvalidArgumentException(sprintf('"%s" does not have constant with value "%s".', static::class, $value));
+        }
+        return $constantName;
+    }
+}