PHP file to open and modify other php (With find and replace via regex?)

I want to do the following

I want to create .php file (executed via cronjobs) that will paste this code $files[] = 'example.php'; to other php file (paste.php) but it has to开发者_StackOverflow find the lastest $files[] line like regex $files[] = '(AnythingHere)'; and after this line to paste the new line. It can have random number of pages so I have no way of knowing.

<?php

    if (!isset($php_file)) {

        $files[] = 'page1.php';

        $files[] = 'page2.php';

        $files[] = 'page3.php';

        $files[] = 'page4.php';

        $file = $files[ rand(0,count($files)) ];

I hope you guys understand what I want; can anyone help me out with this one?

if you have ONLY $file[] = '...' in paste.php, you can simply append to the file:

$line = '$file[] = "pageX.php";' . PHP_EOL;
file_put_contents('paste.php', $line, FILE_APPEND);

of you want the last "page[]" enty.

$yourNewLine = '$file[] = "pageX.php";';  // this is an example. put your "line" prm here
$filename = 'paste.php';
$lines = file($filename);
$lines = array_reverse($lines)
$found = false;
$i = 0;
while ( ! $found )
{
    if ( strpos($lines[$i], '$files[] = ' === 0) ) 
    {
        $found = true;
        array_splice($lines, $i, 0, $yourNewLine.PHP_EOL);
    }   
    $i++;   
}
$lines = array_reverse($lines);
file_put_contents($filename, $lines);

Instead of doing it this way, how about instead setting your files array in a script and then include it at the top. This way you can reference the array directly and still only have to edit the file listing in only one place.

Quick and dirty first-fit solution:

1. Open the file
2. Read each line until you find one matching your regex for $files[] = ...
3. Read more lines until you find one that doesn't match the regex
   1. Write each line read in 2 and 3 to the output file
4. Insert your new line into the output
5. Write the rest of the input to the output

This may not be the best way to approach the problem, drawbacks being that you have to read each line in and compare it with your regex until you find your insertion point. You'll also probably have a temporary file for output which you'll then rename to the original filename.

You'll have 2 while loops:

while (line does not match): read next line

and then

while (line does match): read next line

Someone who knows PHP better than I do might be able to come up with something a bit cleaner, but if you're just looking for something quick to get the job done, this ought to work.

Having this code:

$filesArray = array('page1.php','page2.php','page3.php','page4.php','page5.php',);

then getting the php file with $data = file("path/to/editable_file.php");

foreach($data as $line)
{
    if(preg_replace("/\$filesArray\s=\sarray\([\w'.,]+()\);/", "'".$newfilename."',", $line, $match))
    {
        file_put_contents(implode("\r\n", $data));
        break;
    }
}