PHP获取文件内容的几种方法

1.file_get_contents得到文件的内容

<?php
    header("content-type:text/html;charset=utf-8");

    $file_path = 'lock.txt';

    $conn = file_get_contents($file_path);
    $conn = str_replace("
", "<br/>", $conn);
    echo $conn;
    fclose($conn);
?>

2.用fopen+fgets得到文件内容

<?php
    header("content-type:text/html;charset=utf-8");

    $file_path = 'lock.txt';

    if(file_exists($file_path)){
        if($fp = fopen($file_path,'a+')){
            while(!feof($fp)){
                $conn = fgets($fp);
                $conn = str_replace("
", "<br/>", $conn);
                echo $conn;
            }
        }else{
            echo "文件打不开";
        }
    }else{
        echo "没有这个文件";
    }
    fclose($fp);
?>

3.用fopen+fread获得文件内容

<?php
    header("content-type:text/html;charset=utf-8");

    $file_path = 'lock.txt';

    if(file_exists($file_path)){
        if($fp = fopen($file_path,'a+')){
            $conn = fread($fp, filesize($file_path));
            $conn = str_replace("
", "<br/>", $conn);
            echo $conn;
            }
        }else{
            echo "文件打不开";
        }
    }else{
        echo "没有这个文件";
    }
    fclose($fp);
?>

4.循环读取获得文件内容

<?php
    header("content-type:text/html;charset=utf-8");

    $file_path = 'lock.txt';

    if(file_exists($file_path)){
        if($fp = fopen($file_path,'a+')){
            $buffer=1024; 
            $str=""; 
            while(!feof($fp)){ 
            $str.=fread($fp,$buffer); 
            }
            $str=str_replace("
","<br>",$str); 
            echo $str; 
        }else{
            echo "文件打不开";
        }
    }else{
        echo "没有这个文件";
    }
    fclose($fp);
?>