[PHP] On remove http from url string

2008-11-15T23:09:11-08:00

I'd go with fain182's solution (above) as it is faster (as it doesn't have to load the regex engine) but would strtolower the url first or use str_ireplace() if these urls are coming from user input.

[PHP] On Array To Tablerows

2008-10-28T07:57:13-07:00

Love the one liner, but at the same time omg.

[PHP] On Generate a numbered file name

2008-10-28T07:48:56-07:00

If the only reason for the number is to ensure the file doesn't exist why not use a unix timestamp?
For most intents and purposes it will always be unique and it will increment itself.
Also I don't se a need to use sprintf for this...
As a result you can strip out all this checking code and just have:

<?php
function unique_file($prefix, $suffix)
{ 
   return $prefix.$suffix.time();
}
?>

[PHP] On Mortgage Calculator

2008-10-28T07:34:45-07:00

Maybe you should post this under the java category?

That said I'd expect it to work pretty much as is, just with a change to how you reference the variables php uses $varname, not sure how java does this...

Hope that helps

[PHP] On Universal File Download Class

2008-08-20T16:20:58-07:00

@Ishkur

I try to avoid back-ticks as (for me at least) they obfuscate the code a little bit.

That said, it may give a small performance boost - I don't know as I've not done any such tests, but maybe I will if I get 5 mins :)

[PHP] Universal File Download Class

2008-08-16T11:21:49-07:00

After finding different hosting companies having wildly different policies when it comes to what's enabled and what isn't in PHP, I'm trying to build a generic file download class which will work in almost all situations.

What I'd like to know is if any of the code below can be made more efficient or robust and also if anyone has a function for achieving the equivalent wget call in windows.

I should just mention that this class has been cleaned of some application specific code, so if there's any disjointed bits I apologise - I have tried to deal with any discontinuities before posting but there may be something i've missed (this is also the reason for the bunch of if's in get_file() - the main version follows a few other processes/checks before attempting one of the download functions).

Thanks

Chris

<?php

class RequestFile
{
    public $StatusLogOn = FALSE;    //turn logging on/off (TRUE/FALSE)
    
    //tries different methods for retrieving a url as 
    //each hosting company tends to screw this up in one way or another
    //it logs the successful one in the db for use next time
    public function get_file($url)
    {
        //attempt the standard file_get_contents 
        $data = $this->cc_file_get_contents($url); 
        
        //if that didn't work try curl
        if(!$data)
        {
            $data = $this->cc_curl_file($url);             
        }
        
        //if that didn't work try a socket
        if(!$data)
        {
            $data = $this->cc_socket_file($url);         
        }
        
        //if all else fails we can try wget (assuming we're on linux)
        if(!$data)
        {
            $data = $this->cc_wget_file($url);             
        }
        
        return $data;
    }
    
    //minor modification to file_get_contents to log if it worked or not
    //note this or (fopen) will not work if allow_url_fopen = 0 in php.ini
    public function cc_file_get_contents($url)
    {
        if($data = file_get_contents($url))
        {
            $this->log_status(date("H:i:s d-m-Y").' SUCCESS: Data Has Been Downloaded Using file_get_contents');
            return $data;
        }
        else
        {    
            if (ini_get('allow_url_fopen') != '1') 
            {
               $msg = "fopen wrappers are disabled";
            }
                    
            $this->log_status(date("H:i:s d-m-Y").' FAIL: '.$msg);
            
            return FALSE;    
        }
    }
    
    //try and use curl
    public function cc_curl_file($url)
    {
        // make sure curl is installed
        if (function_exists('curl_init')) 
        {
            $ch = curl_init();                                                //initialize a new curl resource    
            curl_setopt($ch, CURLOPT_URL, $url);                            //set the url to fetch
            curl_setopt($ch, CURLOPT_HEADER, 0);                            //don't give me the headers just the content
            curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);   //return the value instead of printing the response to browser
            curl_setopt($ch, CURLOPT_USERAGENT, $this->rand_user_agent());    //use a user agent to mimic a browser    
            $data = curl_exec($ch);                                            //run the command
            curl_close($ch);                              //remember to always close the session and free all resources
            
            $this->log_status(date("H:i:s d-m-Y").' SUCCESS: Data Has Been Downloaded Using CURL');
            return $data;
        } 
        else
        {
            $this->log_status(date("H:i:s d-m-Y").' FAIL: CURL is not installed');
            return FALSE;
        }        
    }
    
    //try and use sockets - this code is untested
    public function cc_socket_file($url)
    {
        $parsedUrl = parse_url($url);    //get the host name and url path
    
        $host = $parsedUrl['host'];
    
        if(isset($parsedUrl['path'])) 
        {
            $path = $parsedUrl['path'];
        } 
        else 
        {
            $path = '/';    //the url is pointing to the host like http://www.mysite.com
        }
        
        if (isset($parsedUrl['query'])) 
        {
            $path .= '?'.$parsedUrl['query'];
        }
        
        if (isset($parsedUrl['port'])) 
        {
            $port = $parsedUrl['port'];
        } 
        else 
        {
            $port = '80';    //most sites use port 80
        }
        
        $timeout = 10;
        $response = '';
        
        $fp = @fsockopen($host, '80', $errno, $errstr, $timeout);    //connect to the remote server
        
        if(!$fp) 
        {
            $this->log_status(date("H:i:s d-m-Y").' FAIL: Socket Failed Cannot Retrieve '.$url);
            return FALSE;
        } 
        else 
        {
            //send the necessary headers to get the file
            fputs($fp,    "GET $path HTTP/1.0\r\n" .
                        "Host: $host\r\n" .
                        "User-Agent: ".$this->rand_user_agent()."\r\n" .
                        "Accept: */*\r\n" .
                        "Accept-Language: en-us,en;q=0.5\r\n" .
                        "Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7\r\n" .
                        "Keep-Alive: 300\r\n" .
                        "Connection: keep-alive\r\n" .
                        "Referer: http://$host\r\n\r\n");
        
            //retrieve the response from the remote server
            while($line = fread($fp, 4096)) 
            {
                $response .= $line;
            }
            
            fclose($fp);
            
            //strip the headers
            $pos = strpos($response, "\r\n\r\n");
            $response = substr($response, $pos + 4);
        }
        
        $this->log_status(date("H:i:s d-m-Y").' SUCCESS: Data Has Been Downloaded Via A Socket Connection');
        return $response;    
    }
    
    //try and use wget if on linux
    public function cc_wget_file($url)
    {
        $cmd = "wget '".$url."'";
        exec($cmd);
    
        if($data = file_get_contents("broadcast"))    //the file gets saved as file simply called broadcast
        {
            $this->log_status(date("H:i:s d-m-Y").' SUCCESS: File Downloaded Using wget');
            return $data;
        }
        else
        {
            $this->log_status(date("H:i:s d-m-Y").' FAILED: Data Could not be retrieved using wget and file_get_contents');
            return FALSE;
        }        
    }
    
    //select an random user agent from the db
    public function rand_user_agent()
    {
        $sql = "SELECT * FROM cc_user_agents ORDER BY rand()";    
        
        //code to get a record from the database goes here
        
        if($row === FALSE || !$row[0])
        {
            $this->log_status(date("H:i:s d-m-Y").' FAIL: Could Not Retrieve Random User Agent - Using Default');
            return "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.0.3) Gecko/20060426 Firefox/1.5.0.3";
        }
        else
        {
            return $row[0];
        }
    }
    
    //log status to a file
    public function log_status($msg)
    {
        if($this->StatusLogOn === TRUE)
        {
            $path = "RequestFile.status.log";
            $data = file_get_contents($path);
            $data .= "\n".$msg;
            file_put_contents($data, $path);
        }
        
        return TRUE;
    }
}

?>

[PHP] On MySQL original PHP 5 wrapper class

2008-08-14T07:20:20-07:00

I've had a play with doctrine and to me, although it has loads of great functionality, it's a bit of a bloated monster.

If you're just doing basic ORM, running simple operations, then something like you have presented is more suitable, in my opinion.

[PHP] On Resize image to canvas

2008-08-14T07:00:53-07:00

I don't see any real issues with the way this works, though it all applies to GD lib - unless you're doing a check to see if GD lib's available elsewhere maybe you'd want to include something like that?

[PHP] On Adding seconds to a MySQL timestamp

2008-08-06T07:52:54-07:00

Personally I'd use strtotime() for this - I've not tested it but it's probably quicker

function addSecondsToTimestamp ($_timestamp, $_amount) {
    $time = strtotime($_timestamp) + $_amount;
    return date('Y-m-d H:i:s', $time);
}

Chris Dean