Archive for January, 2010

PHP Paypal IPN Script

2 Comments
Posted 29 Jan 2010 — by admin
Category php

Simple script for posting a valid response back to Paypal service after a sale is completed using the Paypal Instant Checkout payment method. 

<?php
// read the post from PayPal system and add 'cmd'
$req = 'cmd=_notify-validate';

foreach ($_POST as $key => $value) {
  $value = urlencode(stripslashes($value));
  $req .= "&$key=$value";
}

// post back to PayPal system to validate
$header .= "POST /cgi-bin/webscr HTTP/1.0\r\n";
$header .= "Content-Type: application/x-www-form-urlencoded\r\n";
$header .= "Content-Length: " . strlen($req) . "\r\n\r\n";
$fp = fsockopen ('ssl://www.paypal.com', 443, $errno, $errstr, 30);

// assign posted variables to local variables
$item_name        = $_POST['item_name'];
$item_number      = $_POST['item_number'];
$payment_status   = $_POST['payment_status'];
$payment_amount   = $_POST['mc_gross'];
$payment_currency = $_POST['mc_currency'];
$txn_id           = $_POST['txn_id'];
$receiver_email   = $_POST['receiver_email'];
$payer_email      = $_POST['payer_email'];

if (!$fp) {
// HTTP ERROR
} else {
  fputs ($fp, $header . $req);
  while (!feof($fp)) {
    $res = fgets ($fp, 1024);
    if (strcmp ($res, "VERIFIED") == 0) {
      // check the payment_status is Completed
      // check that txn_id has not been previously processed
      // check that receiver_email is your Primary PayPal email
      // check that payment_amount/payment_currency are correct
      // process payment
    } else if (strcmp ($res, "INVALID") == 0) {
      // log for manual investigation
    }
  }
fclose ($fp);
}

I grabbed this script from Paypal Docs… I never can find the info I need w/in their site so I’m posting here for reference. https://www.paypal.com/us/cgi-bin/webscr?cmd=p/pdn/ipn-codesamples-pop-outside#php

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Listing Files and Directories with PHP

No Comments
Posted 27 Jan 2010 — by admin
Category php

Listing all files and directories using PHP 5.

<?php
$files = array(); $dir = dir(".");
while(false!==($file=$dir->read())):
  if(($file{0}!=".") && ($file{0}!="~") && (substr($file, -3)!="LCK")
    && ($file!=basename($_SERVER["PHP_SELF"]))):
      $files[$file] = stat($file); //
    endif;
endwhile;
$dir->close(); ksort($files); ?>

<table border=1 cellpadding=5>
<tr><th>Name</th><th>Size</th><th>Date</th></tr>
<?php foreach($files as $name => $stats): ?>
  <tr>
    <td><?php print $name;?></td>
    <td><?php print $stats['size']; ?></td>
    <td><?php print date("m-d-Y h:ia", $stats['mtime']); ?></td>
  </tr>
<?php endforeach; ?></table>
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Highlight String in PHP

1 Comment
Posted 23 Jan 2010 — by admin
Category php

Function for highlighting text/strings in PHP. 

$content = file_get_contents("http://php.net/");

print highlight("PHP", $content);

function highlight($match, $string){
  return str_ireplace($match, "<span style='background:yellow'>$match</span>", $string);
}

Will output something like this

Highlighted PHP.Net

Highlighted PHP.Net

***Notice all the styles are gone :( … would need to parse the document body to maintain stylesheet and other ‘php’ strings that might be in resources paths.

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Absolutize Relative Links Using PHP and Preg_Replace_Callback

1 Comment
Posted 13 Jan 2010 — by admin
Category php

I was in the market for a simple php script to replace hrefs with their absolute paths from scraped web pages. I wrote one myself. I used the preg_replace_callback function so that I could pass the parsed results as a single variable. 

<?php
$domain = "http://seanbehan.com";
$pattern = "/\bhref=[\"|'](.*?)[\"|']/";
$string = file_get_contents($domain);

// prepends relative links w/ $domain skips returns the match if already absolute
function replace_href($match){
  global $domain;
  if(substr($match[1], 0, 7)!=="http://" && substr($match[1],0,8)!=="https://"){
    return "href='".$domain.$match[1]."'";
  } else {
    return "href='".$match[1]."'s";
  }
}
print preg_replace_callback($pattern, "replace_href", $string);
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