$file_path = "a.php";//file$file_arr = file($file_path);if(file_exists($file_path)){    $file_arr = file($file_path);    for($i=0;$i<count($file_arr);$i++) {//逐行读取文件内容        echo $file_arr[$i] . "<br />";        fclose($file_arr);    }}//freadif(file_exists($file_path)){    $fp = fopen($file_path,"r");    $str = fread($fp,filesize($file_path));//指定读取大小,这里把整个文件内容读取进去    $str = fread($fp,filesize($file_path));//指定读取大小,这里把整个文件内容读取进去    echo $str = str_replace("\r\n","<br />",$str);    fclose($fp);}if(file_exists($file_path)){    $fp = fopen($file_path,"r");    $str = "";    $buffer = 1024;//每次读取 1024 字节    while(!feof($fp)){//循环读取,直至读取残缺个文件        $str .= fread($fp,$buffer);    }    $str = str_replace("\r\n","<br />",$str);    echo $str;    fclose($fp);}//file_get_contentsif (file_exists($file_path)){    $str = file_get_contents($file_path);}//fgetsif(file_exists($file_path)){    $fp = fopen($file_path,"r");    $str ="";    while(!feof($fp)){        $str .= fgets($fp);//逐行读取。如果fgets不写length参数,默认是读取1k。    }    $str = str_replace("\r\n","<br />",$str);    echo $str;    fclose($fp);}