如何更改由PHP代码动态生成的HTML页面标题

Question

My PHP code is generating 495 HTML pages from 495 txt files and working correctly. But right now, I'm trying to change it as a way to change the value of title tag dynamically; so I'm trying to replace %TITLE% with $Oneline that is the first line of each txt pages.

I have tried many syntaxes such as prg_replace , str_replace and much more all seems unsuccessful. In fact those lines of codes change nothing on my HTML pages.

To be more clear:

1. Trying to replace %TITLE% with $Oneline .
2. $Oneline is the first line of the txt file.

Thanks for any help.

<?php
for ($i = 1; $i <= 495; $i++)
{$j = 1;
$SousrceFile = @fopen($SousrceFile, 'r') ;
$TargetFile = fopen($TargetFile, 'w+') ;
fwrite($TargetFile, "<title>%TITLE%</title>\n");
    while ($Oneline = @fgets($SousrceFile, 4096)) 
    {$j = $j + 1;
        if (strlen($Oneline) !==0)
        {
        $title = $Oneline;
        $newTitle = preg_replace('%TITLE%',  $title, $newTitle,1 );
        ...?>

Answer 1

Please take a look at preg_replace() , the parameters are

preg_replace ( mixed $pattern , mixed $replacement , mixed $subject [, int $limit = -1 [, int &$count ]] )

In your code you are using the variable $title to replace the pattern in $newTitle with a limit of one. I think you want to replace the text in the target file instead.

Update: There are two solutions that come into my mind right now:

1. Instead of writing your text into the file directly, write it into a variable instead. This variable can be searched by preg_replace() and you can change your title dynamically. After you done that, write the variable into the targe file by eg fputs() .
2. Instead of replacing the title, set the title directly where it is needed, when you are writing the header section. Than there is no need for replacing.

I would recommend solution one. You know how to do that?

Answer 2

据我所知，$ newTitle没有在pre_replace之前定义。

Answer 3

After I couldn't solve the problem, I moved the retreiving data loop to above of the title and as Aaron suggested at this post It made it quiet simple as bellow:

<?php
for ($i = 1; $i <= 495; $i++)
{$j = 1;
$SousrceFile = @fopen($SousrceFile, 'r');
$TargetFile = fopen($TargetFile, 'w+');
while ($Oneline = @fgets($SousrceFile, 4096)) 
{$j = $j + 1;
if (strlen($Oneline) !==0)
$title = $Oneline;
fwrite($TargetFile, "<title>{$title}</title>\n");
...?>