php 读取最后几行文件

$file = '/abc.php';

$fp = fopen($file, "r");

$line = 30;

$pos = -2;//文件最后一行字符为 \r\n 

$t = " ";

$data = [];

while ($line > 0) {

    while ($t != "\n") {

        if(fseek($fp, $pos, SEEK_END) !== 0){

            break;

};

        $t = fgetc($fp);

        $pos --;

}

    $t = " ";

$str =  fgets($fp);

    if( $str   === false){

        break;

}

    $data[] = $str;

    $line --;

}

fclose($fp);

$data = array_reverse($data);

var_dump($data);