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system/Log/Handlers/ErrorlogHandler.php

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+<?php
+
+/**
+ * This file is part of CodeIgniter 4 framework.
+ *
+ * (c) CodeIgniter Foundation <admin@codeigniter.com>
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace CodeIgniter\Log\Handlers;
+
+use CodeIgniter\Log\Exceptions\LogException;
+
+/**
+ * Log handler that writes to PHP's `error_log()`
+ */
+class ErrorlogHandler extends BaseHandler
+{
+    /**
+     * Message is sent to PHP's system logger, using the Operating System's
+     * system logging mechanism or a file, depending on what the error_log
+     * configuration directive is set to.
+     */
+    public const TYPE_OS = 0;
+
+    /**
+     * Message is sent directly to the SAPI logging handler.
+     */
+    public const TYPE_SAPI = 4;
+
+    /**
+     * Says where the error should go. Currently supported are
+     * 0 (`TYPE_OS`) and 4 (`TYPE_SAPI`).
+     *
+     * @var int
+     */
+    protected $messageType = 0;
+
+    /**
+     * Constructor.
+     *
+     * @param mixed[] $config
+     */
+    public function __construct(array $config = [])
+    {
+        parent::__construct($config);
+
+        $messageType = $config['messageType'] ?? self::TYPE_OS;
+
+        if (! is_int($messageType) || ! in_array($messageType, [self::TYPE_OS, self::TYPE_SAPI], true)) {
+            throw LogException::forInvalidMessageType(print_r($messageType, true));
+        }
+
+        $this->messageType = $messageType;
+    }
+
+    /**
+     * Handles logging the message.
+     * If the handler returns false, then execution of handlers
+     * will stop. Any handlers that have not run, yet, will not
+     * be run.
+     *
+     * @param string $level
+     * @param string $message
+     */
+    public function handle($level, $message): bool
+    {
+        $message = strtoupper($level) . ' --> ' . $message . "\n";
+
+        return $this->errorLog($message, $this->messageType);
+    }
+
+    /**
+     * Extracted call to `error_log()` in order to be tested.
+     *
+     * @codeCoverageIgnore
+     */
+    protected function errorLog(string $message, int $messageType): bool
+    {
+        return error_log($message, $messageType);
+    }
+}