从PHP写入html中的特定行

I'm new to php. The thing I'm trying to accomplish here is to see what is the number of the last line in my html document (1,2,3...) and put that value into a variable and write

Hello world

to the html document but 2 or 3 lines above the last line. So right above the body close tag. I have been trying for days now and nothing seems to work.

sampletext.html

    <html>
<head>
     <title>WEB</title>
   </head>
 <body>
   <p>WEB test 335</p>
 </body>
    </html>

This one doesn't output:

<?php
$file = new SplFileObject('sampletext.html');
$file->seek(3);     // Seek to line no. 4
echo $file->current(); // Print contents of that line
?>

I also tried this one ,but it only writes at the end of the file:

<?php
 $file = fopen("sampletext.html","a");  //I also tried w,a+,r,r+ 
 $txt = "Hello world";
 fseek(fp, 0, SEEK_END);
 fwrite($file, $txt);
 fclose($file);
 ?>

There are a more but I can't seem to find them in my testing folder. I have read somewhere that it's possible to move the last few lines into temp memory and fwrite something and then move the lines from temp memory back into the file.

As I mentioned before I am very new to php and don't fully understand it yet!

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doufuxing8562
doufuxing8562
2019/02/14 18:18
  • fopen
  • fwrite
  • php
  • html
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