Php Development » PHP/mysql

php auto append ,prepend file using htaccess

mahesh chari — Sun, 23 May 2010 05:10:57 +0000

Automatically append and prepend a php file to current script using htaccess

It is best practice to add common file to every php script in our application ,such as libraries cleaning input variables from $_GET,$_POST,$_COOKIE,cleaning or modifying the output of the php script by providing plug in functionality.

We know best example for this many free hosting providers use this settings. they append a advertisement script to our files while it output buffering.

here we learn how to add or remove append or prepend files using htaccess. to continue this tutorial we must have the knowledge of htaccess of apache and basic settings in php.ini

add files to script

this can be achieved by auto_append_file and auto_prepend_file php configuration options.These options can be set in the PHP config, virtual host settings or in a .htaccess file. This post shows how to set these and how to override a setting so no file is appended or prepended.

Example

We have three files append.php, mainscript.php, prepend.php and htaccess file to achieve this.


//prepend.php
echo "this is the prepended file
\n";
?>


//mainscript.php
echo "this is the main file
\n";
?>


//append.php
echo "this is the appended file
\n";
?>

Out put of our mainscript file

this is the prepended file

this is the main file

this is the appended file

Set up php values in htaccess

prepending a file

php_value auto_prepend_file prepend.php

Append a file

php_value auto_prepend_file append.php

Removing or modify existing values

we can override these values for each php file or each directory in our application. we can remove existing auto_append ,auto_prepend values by setting its values to none.

php_value auto_append_file none
php_value auto_prepend_file none

list tables in mysql database with php

mahesh chari — Tue, 20 Apr 2010 02:54:41 +0000

How to display mysql tables in given database using php

we know that it common practice to list database tables in mysql related backup php scripts.we learn here how to display the tables in given mysql database. for that we need to select a database and create some test tables with below queries .

CREATE TABLE  `testtable` (
  `test_id` int(10) unsigned NOT NULL auto_increment,
  `test_name` varchar(45) NOT NULL,
  `test_created` datetime NOT NULL,
  PRIMARY KEY  (`test_id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
 
CREATE TABLE  `testtable1` (
  `test_id1` int(10) unsigned NOT NULL auto_increment,
  `test_name1` varchar(45) NOT NULL,
  `test_created1` datetime NOT NULL,
  PRIMARY KEY  (`test_id1`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
 
CREATE TABLE  `testtable2` (
  `test_id2` int(10) unsigned NOT NULL auto_increment,
  `test_name2` varchar(45) NOT NULL,
  `test_created2` datetime NOT NULL,
  PRIMARY KEY  (`test_id2`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
 
 
CREATE TABLE  `testtable3` (
  `test_id3` int(10) unsigned NOT NULL auto_increment,
  `test_name3` varchar(45) NOT NULL,
  `test_created3` datetime NOT NULL,
  PRIMARY KEY  (`test_id3`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

Code Example

//replace it with your host normally it could be localhost
$hostname='localhost';
//mysql user name
$username='root';
//mysql user password
$password='';
//connect to the mysql server
$ss = mysql_pconnect($hostname, $username, $password) or trigger_error(mysql_error(),E_USER_ERROR); 
//select a database on the mysql server
//please change as you like the database name
mysql_select_db('database'); 
 
//SHOW COLUMNS FROM TABLENAME
$query=mysql_query('SHOW TABLES ') or die(mysql_error());
 
//iterate trough the query result and fetch each field
while($field=mysql_fetch_row($query)){
$fields[]=$field[0];//collect each field into a array
};
 
print_r($fields);//test the fields array

Output

Array
(
    [0] => testtable
    [1] => testtable1
    [2] => testtable2
    [3] => testtable3
)

print mysql table fields

mahesh chari — Sun, 18 Apr 2010 13:40:29 +0000

How to display mysql table fields using PHP

It is common to find the mysql table field names in the given table while creating dynamic models for our web applications.To continue this tutorial we have to create a test table. Below mysql query is used to create this test table.

CREATE TABLE  `testtable` (
  `test_id` INTEGER UNSIGNED NOT NULL AUTO_INCREMENT,
  `test_name` VARCHAR(45) NOT NULL,
  `test_created` DATETIME NOT NULL,
  PRIMARY KEY (`test_id`)
)
ENGINE = InnoDB;

SHOW COLUMNS FROM TABLENAME query is used for list the mysql fields.

below code lists the mysql table fields.

//replace it with your host normally it could be localhost $hostname='localhost'; //mysql user name $username='username'; //mysql user password $password='password'; //connect to the mysql server $ss = mysql_pconnect($hostname, $username, $password) or trigger_error(mysql_error(),E_USER_ERROR); //select a database on the mysql server //please change as you like the database name mysql_select_db('mydatabase'); //SHOW COLUMNS FROM TABLENAME $query=mysql_query('SHOW COLUMNS FROM testtable ') or die(mysql_error()); //iterate trough the query result and fetch each field while($field=mysql_fetch_object($query)){ $fields[]=$field;//collect each field into a array }; print_r($fields);//test the fields array foreach($fields as $key=>$field){ echo $field->Field.'
'; // print each field name } ?>

Upload Image File To Remote Server With PHP cURL

mahesh chari — Fri, 26 Mar 2010 23:40:55 +0000

How to upload image file to remote server with PHP cURL

In this example we learn how to upload static files to remote server using PHP cURL library.

We must know following functionality before we continue this example

PHP file upload functionality.

cURL function reference.

how to submit data to remote server with PHP cURL

Files and Folders

Download Example

For this example we use three files

uploader.php -that receives the files on to the remote server.

handler.php -is used to web based client to upload the file.

curl_handler.php -PHP cURL uploading client to upload file.

Since we use same host to both local and remote server ,we create separate directories

local_files/ - these files will be uploaded to the remote server ,means to uploaded_files directory.

uploaded_files/ – these files are from the uploading client from both web based and PHP cURL based.

uploader.php

$upload_directory=dirname(__FILE__).'/uploaded_files/'; //check if form submitted if (isset($_POST['upload'])) { if (!empty($_FILES['my_file'])) { //check for image submitted if ($_FILES['my_file']['error'] > 0) { // check for error re file echo "Error: " . $_FILES["my_file"]["error"] ; } else { //move temp file to our server move_uploaded_file($_FILES['my_file']['tmp_name'], $upload_directory . $_FILES['my_file']['name']); echo 'Uploaded File.'; } } else { die('File not uploaded.'); // exit script } }

handler.php

curl_handler.php

$local_directory=dirname(__FILE__).'/local_files/'; $ch = curl_init(); curl_setopt($ch, CURLOPT_HEADER, 0); curl_setopt($ch, CURLOPT_VERBOSE, 0); curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); curl_setopt($ch, CURLOPT_USERAGENT, "Mozilla/4.0 (compatible;)"); curl_setopt($ch, CURLOPT_POST, true); curl_setopt($ch, CURLOPT_URL, 'http://localhost/curl_image/uploader.php' ); //most importent curl assues @filed as file field $post_array = array( "my_file"=>"@".$local_directory.'shreya.jpg', "upload"=>"Upload" ); curl_setopt($ch, CURLOPT_POSTFIELDS, $post_array); $response = curl_exec($ch); echo $response;

Download Example

Serve your PHP file as JavaScript file

mahesh chari — Wed, 24 Mar 2010 17:23:17 +0000

Serve Your PHP script as JavaScript file.

Some times we need to serve user based JavaScript files, for example

passing your php variables to JavaScript on client side of browser.

protecting JavaScript variables.

setting browser cache manually for JavaScript files.

loading user based java script files.

for easy versification of your JavaScript files.

Download Demo

Suppose your php-javascript file “my-phpjavascript.js.php” ,now you can add this file as below example.

Client HTML code

my-phpjavascript.js.php code

// this is PHP variable $sitename="My PHP development blog."; ?> //this is javascript variable var site_name=" echo $sitename;?>";

some browsers don’t recognize this php file as javascript ,so to make all browser compatibility we have to send javascript headers to browser ,we can do that by adding a few line of code at starting of php script.

header( "Content-Type: text/javascript; charset=utf-8" ); ?>

Remember to preview this code you must installed PHP

Download Demo

Submitting form to remote server with array of parameters

mahesh chari — Thu, 18 Mar 2010 01:04:34 +0000

submit a form with post method to remote server using php curl

We learn how to submit the form data to remote server in my previous example with URL string.
Here we can pass data with POST multipart method,main difference is that we passs it as array.

To submit forms using cURL, we need to follow the below steps:

1. Prepare the data to be posted
2. Connect to the remote URL
3. Post (submit) the data
4. Fetch response and display it to the user or do some other stuff with it.

Below Example Has two files,one to post the data and other is to process the data.

/* * Data which is to submitted to the remote URL */ $post_array = array('fname'=>'mahesh','lname'=>'chari'); /* * Initialize cURL and connect to the remote URL * You will need to replace the URL with your own server's URL * or wherever you uploaded this script to. */ $ch = curl_init(); curl_setopt($ch, CURLOPT_URL, 'http://example.com/curlpost_handler.php' ); /* * Instruct cURL to do a regular HTTP POST */ curl_setopt($ch, CURLOPT_POST, TRUE); /* * Specify the data which is to be posted */ curl_setopt($ch, CURLOPT_POSTFIELDS, $post_array); /* * Tell curl_exec to return the response output as a string */ curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE); /** * Execute the cURL session */ $response = curl_exec($ch ); /** * Close cURL session and file */ curl_close($ch ); echo $response; // is Welcome Maheshchari.

Handling post data on curlpost_hanlder.php

$firstname=$_POST['fname']; $lastname=$_POST['lname']; echo "Welcome ".$firstname.$lastname;

submit a form to remote server with php curl

mahesh chari — Thu, 18 Mar 2010 01:00:03 +0000

Submitting form to remote server.

We learned some basics in my previous article cURL basics. Here we cover a topic how to submit a form to remote server.

To submit forms using cURL, we need to follow the below steps:

1. Prepare the data to be posted
2. Connect to the remote URL
3. Post (submit) the data
4. Fetch response and display it to the user or do some other stuff with it.

Below Example Has two files,one to post the data and other is to process the data.

/* * Data which is to submitted to the remote URL */ $post_str = urlencode("fname=mahesh&lname=chari"); /* * Initialize cURL and connect to the remote URL * You will need to replace the URL with your own server's URL * or wherever you uploaded this script to. */ $ch = curl_init(); curl_setopt($ch, CURLOPT_URL, 'http://example.com/curlpost_handler.php' ); /* * Instruct cURL to do a regular HTTP POST */ curl_setopt($ch, CURLOPT_POST, TRUE); /* * Specify the data which is to be posted */ curl_setopt($ch, CURLOPT_POSTFIELDS, $post_str); /* * Tell curl_exec to return the response output as a string */ curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE); /** * Execute the cURL session */ $response = curl_exec($ch ); /** * Close cURL session and file */ curl_close($ch ); echo $response; // is Welcome Maheshchari.

Handling post data on curlpost_hanlder.php

$firstname=$_POST['fname']; $lastname=$_POST['lname']; echo "Welcome ".$firstname.$lastname;

php curl basic reference

mahesh chari — Thu, 18 Mar 2010 00:54:50 +0000

cURL basics and functions over view

cURL is a PHP library which allows you to connect and communicate to many different types of servers with many different types of protocols.Main difference is it has session capability unlik fopen. We can make small scale robot script with cURL functions in PHP.

With cURL we can:

Implement payment gateways’ payment notification scripts.

Download and upload files from remote servers.

Login to other websites and access members only sections.

Cross site communication with PHP backend and Ajax.

PHP cURL library is definitely the odd man out. Unlike other PHP libraries where a whole plethora of functions is made available, PHP cURL wraps up a major parts of its functionality with following functions.

Curl functions are:

curl_close — Close a cURL session

curl_copy_handle — Copy a cURL handle along with all of its preferences

curl_errno — Return the last error number

curl_error — Return a string containing the last error for the current session

curl_exec — Perform a cURL session

curl_getinfo — Get information regarding a specific transfer

curl_init — Initialize a cURL session

curl_multi_add_handle — Add a normal cURL handle to a cURL multi handle

curl_multi_close — Close a set of cURL handles

curl_multi_exec — Run the sub-connections of the current cURL handle

curl_multi_getcontent — Return the content of a cURL handle if CURLOPT_RETURNTRANSFER is set

curl_multi_info_read — Get information about the current transfers

curl_multi_init — Returns a new cURL multi handle

curl_multi_remove_handle — Remove a multi handle from a set of cURL handles

curl_multi_select — Wait for activity on any curl_multi connection

curl_setopt_array — Set multiple options for a cURL transfer

curl_setopt — Set an option for a cURL transfer

curl_version — Gets cURL version information

curl_setopt is the pivot around which the main cURL functionality revolves. cURL functioning is controlled by way of passing predefined options and values to this function.

A simple example to handle google rss feed

/* * * Initialize the cURL session */ $curl_handler = curl_init(); /* * * Set the URL of the page or file to download. */ curl_setopt($curl_handler, CURLOPT_URL, 'http://news.google.com/news?hl=en&topic=t&output=rss'); /* * * Ask cURL to return the contents in a variable * instead of simply echoing them to the browser. */ curl_setopt($curl_handler, CURLOPT_RETURNTRANSFER, 1); /* * * Execute the cURL session,do some stuff with content */ $contents = curl_exec ($curl_handler); /* * * Close cURL session, *be sure to close the handler as curl stores cookies ,other file data stores on server. */ curl_close ($curl_handler);

In the above example we used CURLOPT_URL,CURLOPT_RETURNTRANSFER options.

php directory lister function

mahesh chari — Thu, 25 Feb 2010 21:17:12 +0000

here is a simple function that iterates a directory recursively and returns as array.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38
function directory_map($source_dir, $top_level_only = FALSE) { if ($fp = @opendir($source_dir)) { //DIRECTORY_SEPARATOR is a constant is different on different Server OS $source_dir = rtrim($source_dir, DIRECTORY_SEPARATOR).DIRECTORY_SEPARATOR; $filedata = array(); //let grab all files n directorys into this array //readdire iterates all the files n folders and returns while (FALSE !== ($file = readdir($fp))) { if (strncmp($file, '.', 1) == 0) { continue;//if file or dir name is only '.' ,hidden files we skip them } if ($top_level_only == FALSE && @is_dir($source_dir.$file)) { $temp_array = array(); //if is directory call this function itself recursively $temp_array = directory_map($source_dir.$file.DIRECTORY_SEPARATOR); $filedata[$file] = $temp_array; } else { $filedata[] = $file; } } closedir($fp); //finally close the directory and unlock file or directory data return $filedata; //return as array } } // __FILE__ is PHP constant that tells the present executing script // dirname extracts the directory name from a given file contains $present_directory_with_allfilesandfolder=directory_map(dirname(__FILE__)); $onlyonetopleveldata=directory_map(dirname(__FILE__),true);

Download Demo

php bytes conversion

mahesh chari — Thu, 18 Feb 2010 12:45:58 +0000

PHP byte conversion function

Generelly we need to display the file size in file sharing applications. Here we use below function to display the size in bytes with filesize function.

function byte_convert($bytes) { $symbol = array('B', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'); $exp = 0; $converted_value = 0; if( $bytes > 0 ) { $exp = floor( log($bytes)/log(1024) ); $converted_value = ( $bytes/pow(1024,floor($exp)) ); } return sprintf( '%.2f '.$symbol[$exp], $converted_value ); //we can't use PHP integer unsigned as some systems use 32 bit and other 64 bit ,so here we use C style function sprintf }

File size stadards

computer data and file size is normally measured in binary code using the binary number system, the prefixes for the multiples are based on the metric system! The nearest binary number to 1,000 is 2^10 or 1,024; thus 1,024 bytes was named a Kilobyte.

New IEC Standard

bit bit 0 or 1

byte B 8 bits

kibibit Kibit 1024 bits

kilobit kbit 1000 bits

kibibyte (binary) KiB 1024 bytes

kilobyte (decimal) kB 1000 bytes

megabit Mbit 1000 kilobits

mebibyte (binary) MiB 1024 kibibytes

megabyte (decimal) MB 1000 kilobytes

gigabit Gbit 1000 megabits

gibibyte (binary) GiB 1024 mebibytes

gigabyte (decimal) GB 1000 megabytes

terabit Tbit 1000 gigabits

tebibyte (binary) TiB 1024 gibibytes

terabyte (decimal) TB 1000 gigabytes

petabit Pbit 1000 terabits

pebibyte (binary) PiB 1024 tebibytes

petabyte (decimal) PB 1000 terabytes

exabit Ebit 1000 petabits

exbibyte (binary) EiB 1024 pebibytes

exabyte (decimal) EB 1000 petabytes

New IEC Standard
bit	bit	0 or 1
byte	B	8 bits
kibibit	Kibit	1024 bits
kilobit	kbit	1000 bits
kibibyte (binary)	KiB	1024 bytes
kilobyte (decimal)	kB	1000 bytes
megabit	Mbit	1000 kilobits
mebibyte (binary)	MiB	1024 kibibytes
megabyte (decimal)	MB	1000 kilobytes
gigabit	Gbit	1000 megabits
gibibyte (binary)	GiB	1024 mebibytes
gigabyte (decimal)	GB	1000 megabytes
terabit	Tbit	1000 gigabits
tebibyte (binary)	TiB	1024 gibibytes
terabyte (decimal)	TB	1000 gigabytes
petabit	Pbit	1000 terabits
pebibyte (binary)	PiB	1024 tebibytes
petabyte (decimal)	PB	1000 terabytes
exabit	Ebit	1000 petabits
exbibyte (binary)	EiB	1024 pebibytes
exabyte (decimal)	EB	1000 petabytes