preg_replace（）不起作用

Question

I am currently trying to change a variable in a configuration file. I've tried the following:

public static function change(){
    $fl = file("../config.inc.php");
    $key = $_POST['key'];
    $id = $_POST['id'];
    $secret = $_POST['secret'];
    $content = "";
    foreach($fl as $line){
        $content .= $line;
    }
    $content = preg_replace("\$licence = array\(\'key\'=>\'(.*?)\'\);$", "licence = array('key'=>'$key');", $content);

    $content = preg_replace("/\$rey_connect = array\((.*?\'client_id\'=>\')(.*?)('.*?\'client_secret\'=>\')(.*?)(\')(.*?)(?:\));(?:
|$)/", "\$rey_connect = array(\1$id\3$secret\5);", $content);

    $myfile = fopen("../config.inc.php", "w") or die("Unable to open file!");
    $txt = "$content";
    fwrite($myfile, $txt);
    fclose($myfile);
}

on the following string:

<?php
# Bitte bearbeiten Sie diese Datei nicht. #

$mysql = array(  'host'=>'localhost',
                        'database'=>'schnnet',
                        'password'=>'root',
                        'user'=>'root');
$licence = array('key'=>'jZf5hhRd5vqmwTkMB9eq');
$rey_connect = array('active'=>true,'client_id'=>'123','client_secret'=>'123456');
?>

So the regex works perfectly on phpliveregex, but not in my script. Somehow it doesn't affect the configuration file's content.

Answer 1

1. Do you put your changes back to config?

// this is really BAD approach
$content = file_get_contents("config");
$content = preg_replace(...);
file_put_contents("config", $content);
// or eval($content);

1. if you want to initiate reconnect to the database with slightly different parameter you can simply move your piece of code to separate function and call it with different parameter, e.g. you have script called utils.php

function connect($host, $db, $pwd, $user, $key, $id, $secret)
{
    $mysql = array('host'=>$host,
                   'database'=>$db,
                   'password'=>$pwd,
                   'user'=>$user);
    $licence = array('key'=>$key);
    $rey_connect = array('active'=>true,'client_id'=>$id,'client_secret'=>$secret);
}

And then include utils.php into another script and call your function there.

include_once 'utils.php';

connect(
 'localhost', 
 'schnnet', 
 'root, 
 'root', 
 'jZf5hhRd5vqmwTkMB9eq', 
 '123', 
 '123456');

UPDATE :

I was able to reproduce issue that you described but have just ran simplified version of your code on my local server and it seems to be working as expected now. Try it.

<?php
    function change()
    {
        $id = 'someId';
        $key = 'someKey';
        $secret = 'someSecret';
        $content = file_get_contents("config.php");

        $content = preg_replace("/(licence[^>]+)([^)]+)(.+)/si", "$1>'" . $key . "'$3", $content);
        $content = preg_replace("/(client_id[^>]+)([^,]+)(.+)/si", "$1>'" . $id . "'$3", $content);
        $content = preg_replace("/(client_secret[^>]+)([^)]+)(.+)/si", "$1>'" . $secret . "'$3", $content);

        file_put_contents("config.php", $content);
    }

    change();
?>