Simple function to write to dev-tools console log

console_log.php

<?php

    // Ment to be used within an existing class
    $this->console_log('log me');

    /**
    * Simple function to write to dev-tools console log
    * @param          $output           Whatever shall be pushed to the log
    * @param  boolean $with_script_tags Flag to enable <script> tags
    */
    private function console_log($output, $with_script_tags = true) {
        $js_code = 'console.log(' . json_encode($output, JSON_HEX_TAG) . ');';
        if ($with_script_tags) {
            $js_code = '<script>' . $js_code . '</script>';
        }
        echo $js_code;
    }