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Home Backend Development PHP Tutorial 碰到一个问题,我觉得肯定有简便写法,但是一时找不到。

碰到一个问题,我觉得肯定有简便写法,但是一时找不到。

Jun 23, 2016 pm 02:11 PM

config.php

array(
  'title='>"123",
  'title2'=>"123",
  'title3'=>"123",
  ......
  无限个
)

这时我一个操作只想改变title2的值,比如改成456
难道一定要全部读取,再重新一次写入文件中?


回复讨论(解决方案)

$array['title2'] = 456;

哦,错了,原来是写进文件。

有两个方案
1,如果文件比较大,就fgets,一行一行读吧,直到读到的为title2,但这个有个坏处,就是注释问题。

2,file_get_content 再 file_put_content

对!需要重新写入
所以大量的数据应用数据库

文件巨大的话可以在#2的方案变通一下,每读一行,视乎需要改动,写入新文件
全部完成后删掉旧文件(或改名bak),再把新文件改名为原来的文件

前提是权限足够

为什么要边读边写呢?
楼主的是 config.php 文件,显然是已经读取进来了的
所以只需将修改后的数组用 var_export 构造成 php 代码写回去就可以了

我说的是文件巨大的情况,如果是config估计也不怎么巨大,

为什么要边读边写呢?
楼主的是 config.php 文件,显然是已经读取进来了的
所以只需将修改后的数组用 var_export 构造成 php 代码写回去就可以了

<?php$handle = fopen("config.php", "r+");$offset = 0;if ($handle) {    while (!feof($handle)) {        $buffer = fgets($handle); //默认为1024         $offset += strlen($buffer);         if(false !== strpos($buffer, '需要替换的字符串')){              fwrite($handle, '你的内容//');把后面的内容注释掉^.^              break;         }    }    fclose($handle);}?> 
Copy after login


指针可能不正确,你需要调试一下!

换个思路吧,

当遇到这种问题的时候,就该想想是不是方向错了。

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