yii long polling

pooling1.php

<?php

if(Yii::app()->request->isAjaxRequest)  {
    session_write_close();
    $linesToLoad = $totalLines-$currentLine;
    if($linesToLoad == 0) {
        echo CJSON::encode(array(
            'type' => 'no data',
            'currentLine' => $currentLine,
            "totalLines" => $totalLines,
            "data" => array(),
        ));
    } else {
        $output = $this->tail($logFile, $linesToLoad);
        echo CJSON::encode(array(
            'type' => 'new data',
            'currentLine' => $currentLine,
            "totalLines" => $totalLines,
            "data" => explode("\n", $output),
        ));
    }
    Yii::app()->end();
}

pooling2.php

<?php

if(Yii::app()->request->isAjaxRequest)  {
    session_write_close();
    $mtime = filemtime($logFile);
    while(1) {
        $totalLines = count(file($logFile));
        $linesToLoad = $totalLines-$currentLine;
        if($linesToLoad != 0) {
            $output = $this->tail($logFile, $linesToLoad);
            echo CJSON::encode(array(
                'type' => 'new data',
                'currentLine' => $currentLine,
                "totalLines" => $totalLines,
                "data" => explode("\n", $output),
            ));
            Yii::app()->end();
        }
        $newmtime = filemtime($logFile);
        if($mtime === $newmtime) {
            sleep(1);
            continue;
        }
    }
}