script to instert text at the begining of every php file in a directory

Somehting like this is what I was thinking in powershell

Get-ChildItem "C:\Backup1" -Filter *.php | Foreach-Object {
Add-Content -path $_ (Get-Content "C:\Scripts\code.txt")
}

Just trying to get it to work now.

Please test this as I have not but something like this might work:

$phpstr = @"
<?php
if (!isset($_SESSION)){
 session_start();
 }
 ?>
"@

Get-ChildItem "C:\Backup1" -Filter *.php | Foreach-Object {
    $content = Get-Content $_
    $phpstr | Set-Content $_ -Force
    $content | Add-Content -path $_ 
}

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Jeremy that script is similar to mine but I think the reason it does not work is because in this line "$content | Add-Content -path $_ " the $_ does not contain the path. It just conaitns the name of the file.

Thanks

Here is the final script that I used.  
$phpstr = get-content "C:\Scripts\code.txt"
Get-ChildItem "C:\htdocs" -recurse -Filter *.php | Foreach-Object {
    $content = Get-Content $_.FullName
    $phpstr | Set-Content $_.fullname
    $content | Add-Content -path $_.fullname
}

Glad to help. Thanks for sharing your script. :)