php tips

OpenSocial's First Birthday: Detailed Agenda -- November 13 in San Francisco

Nov 07, '08

Hi , friendz Next thursday, November 13, is the official event for OpenSocial's first birthday being hosted by the OpenSocial Foundation at MySpace's SF office (SOMA). Highlights of event * OpenSocial: State of the Union * App Developers sharing their experiences: PhotoBuzz, RockYou, and PixVerse * OpenSocial 0.9: What does it mean for me? * Demos of Developer Tools: OpenSocial Dev App, zembly, and iWidgets * "Global Container Crawl" programming contest How many containers can you get running on? Engineers from around the world will be on-hand to help including: hi5, Hyves, iGoogle, LinkedIn, MySpace, Ning, orkut, Viadeo, Yahoo! among others * Breakout sessions for discussions and prototyping Check the full post http://opensocialapis.blogspot.com/2008/11/opensocials-first-birthday-detailed.html

PHP5 Filter Functions

Nov 07, '08

PHP filters are used to validate and filter data coming from insecure sources. e.g. User Inputs... PHP filter_input() Function With filter_input() function we can filter out the data from following sources. 1. INPUT_GET 2. INPUT_POST 3. INPUT_COOKIE 4. INPUT_ENV 5. INPUT_SERVER 6. INPUT_SESSION (Not yet implemented) 7. INPUT_REQUEST (Not yet implemented) this function returns the filtered variable data on success and returns FALSE on the failure or of filter action. Syntax filter_input(input_type, variable, filter, options) input_type = Above List of sources. e.g . INPUT_GET , INPUT_POST. variable = Variable to be validated. filter = Specifies the ID of the filter to use. Default is FILTER_SANITIZE_STRING. Here is the list of php filters. ID Name Description FILTER_CALLBACK------------------Call a user-defined function to filter data FILTER_SANITIZE_STRING-------Strip tags, optionally strip or encode special characters FILTER_SANITIZE_STRIPPED--- Alias of "string" filter FILTER_SANITIZE_ENCODED--- URL-encode string, optionally strip or encode special characters FILTER_SANITIZE_SPECIAL_CHARS HTML-escape '"<>& and characters with ASCII value less than 32 FILTER_SANITIZE_EMAIL----------Remove all characters, except letters, digits and !#$%&'*+-/=?^_`{|}~@.[] FILTER_SANITIZE_URL------------Remove all characters, except letters, digits and $-_.+!*'(), {}|\\^~[]`<>#%";/?:@&= FILTER_SANITIZE_NUMBER_INT----Remove all characters, except digits and +- FILTER_SANITIZE_NUMBER_FLOAT----Remove all characters, except digits, +- and optionally .,eE FILTER_SANITIZE_MAGIC_QUOTES----- Apply addslashes() FILTER_UNSAFE_RAW----------------------- Do nothing, optionally strip or encode special -------------------------------------------------------- characters FILTER_VALIDATE_INT----------------------- Validate value as integer, optionally from the specified -------------------------------------------------------- range FILTER_VALIDATE_BOOLEAN-------------- Return TRUE for "1", "true", "on" and "yes", FALSE for -------------------------------------------------------- "0", "false", "off", "no", and "", NULL otherwise FILTER_VALIDATE_FLOAT------------------- Validate value as float FILTER_VALIDATE_REGEXP---------------- Validate value against regexp, a Perl-compatible ------------------------------------------------------- regular expression FILTER_VALIDATE_URL--------------------- Validate value as URL, optionally with required ------------------------------------------------------ components FILTER_VALIDATE_EMAIL------------------ Validate value as e-mail FILTER_VALIDATE_IP------------------------ Validate value as IP address, optionally only IPv4 or ------------------------------------------------------ IPv6 or not from private or reserved ranges

What Is Json ?

Nov 06, '08

What is JSON ? Javascript Object Notation JSON make easy to interchange between programming language to JavaScript. JSON is class/library that we can use to convert a variable from PHP variable to JavaScript Variable. its another way to use javascript on your site and not have to worry about people having it turned off since doesn't require javascrpt tags to actually run it. it make programing in javascript quicker and more effective. It is a Fat-Free Alternative to XML. It is a new data interchange format. JSON data can be included from websites outside the domain origin of the web application (avoiding the same-origin limitations of XMLHttpRequest) by using JSON-in-script. JSON can be be used as an alternative to XML representation of data with the added benefits that JSON is easier to "parse" for JavaScript client code Sample code snippet to generate JSON string for php array. 'the first', 'b'=>'is second'); $json = new JSON(); echo $json->convert($myArray); ?> 1.) You can download the JSON.php file from this link: http://mike.teczno.com/JSON/JSON.phps check out following code. require_once("JSON.php"); $myArray = Array('a'=>'the first', 'b'=>'is second'); $json = new Services_JSON(); echo $json->encode($myArray); Output : {"a":"the first","b":"is second"} How to turn xml into json: http://www-128.ibm.com/developerworks/xml/library/x-xml2jsonphp/

What Is Json ?

Nov 06, '08

how to check the empty directory in shell script

Nov 05, '08

How to check the empty directory in shell script? This can be easily done with the help ls command. we can simply check the empty directory using following script. DIR="/path/to/directory/" if [ "$(ls -A $DIR)" ]; then echo "Take action $DIR is not Empty" else echo "$DIR is Empty" You can also assign the output of specific command to a separate variable instead of checking it directly in if condition. e.g. myVar=`(grep 'stringToSearch' filename.ext)`; Note: Do not use spaces before and after =.

How to detect the firebug

Nov 04, '08

How to detect the firebug. I use this to detect the firebug.

CSS Properties To JavaScript

Oct 27, '08

CSS Property JavaScript Reference background -> background background-attachment -> backgroundAttachment background-color -> backgroundColor background-image -> backgroundImage background-position -> backgroundPosition background-repeat -> backgroundRepeat border -> border border-bottom -> borderBottom border-bottom-color -> borderBottomColor border-bottom-style -> borderBottomStyle border-bottom-width -> borderBottomWidth border-color -> borderColor border-left -> borderLeft border-left-color -> borderLeftColor border-left-style -> borderLeftStyle border-left-width -> borderLeftWidth border-right -> borderRight border-right-color -> borderRightColor border-right-style -> borderRightStyle border-right-width -> borderRightWidth border-style -> borderStyle border-top -> borderTop border-top-color -> borderTopColor border-top-style -> borderTopStyle border-top-width -> borderTopWidth border-width -> borderWidth clear -> clear clip -> clip color -> color cursor -> cursor display -> display filter -> filter font -> font font-family -> fontFamily font-size -> fontSize font-variant -> fontVariant font-weight -> fontWeight height -> height left -> left letter-spacing -> letterSpacing line-height -> lineHeight list-style -> listStyle list-style-image -> listStyleImage list-style-position -> listStylePosition list-style-type -> listStyleType margin -> margin margin-bottom -> marginBottom margin-left -> marginLeft margin-right -> marginRight margin-top -> marginTop overflow -> overflow padding -> padding padding-bottom -> paddingBottom padding-left -> paddingLeft padding-right -> paddingRight padding-top -> paddingTop page-break-after -> pageBreakAfter page-break-before -> pageBreakBefore position -> position float -> styleFloat text-align -> textAlign text-decoration -> textDecoration text-decoration: blink -> textDecorationBlink text-decoration: line-through -> textDecorationLineThrough text-decoration: none -> textDecorationNone text-decoration: overline -> textDecorationOverline text-decoration: underline -> textDecorationUnderline text-indent -> textIndent text-transform -> textTransform top -> top vertical-align -> verticalAlign visibility -> visibility width -> width z-index -> zIndex

Create Your Orkut Application

Oct 24, '08

Steps to create orkut applications. Platform Orkut applications can be created in XML. 1. Start with the sandbox account on http://sandbox.orkut.com . Register on http://code.google.com/support/opensocialsignup/ 2. Once your account get active , you can start developing your application in sandbox. 3. You can add your XML application by clicking on add application tab. HELP http://code.google.com/apis/orkut/docs/orkutdevguide.html First Time developing application? http://code.google.com/apis/orkut/articles/tutorial/tutorial.html

Memory management in php

Oct 10, '08

Fatal error: Allowed memory size of 8388608 bytes exhausted. sometime PHP script may returns the above error. Normally this error is generated when your script exchausted and used up the default memory requirement of 8 MB memory allocation. * Default memory limit is set in php.ini file ( php configuration file.) * memory_limit = 8M; How can we manage with the memory problems comes in some php scripts? you should check following things when such kind of memory errors occurs in your script. 1. check the default memory_limit variable in your php.ini file. memory_limit = 8M; you can change this memory limit and again check for the error. a. Edit in php.ini memory_limit = 12M; restart the apache service. b. code Level @ini_set('memory_limit', '12M'); c. htaccess php_value memory_limit 12M ___________________________________________________________________ 2. If the error is not resolved after above step, then you should start debugging your code in order to find out the reason of memory limit exceed. You have to first find out at what position in your code the memory limit is exceeding. you can use the php's built in function for this purpose. Function description memory_get_usage — This function returns the amount of memory allocated to PHP. Syntax : int memory_get_usage ( true / false ); It returns the amount of memory, in bytes, that's currently being allocated to your PHP script. Set the option to this function to TRUE to get the real size of memory allocated from system. If not set or FALSE only the memory used by emalloc() is returned. How to use this function 1. Write this code ( echo memory_get_usage( true ); ) repeteadly after some no of lines. 2. Run it in browser 3. Compare the counts given by each echo and you can check which block of your code needs extra memory. 4. Once you identify the block of code which needs extra memory then you can start deallocating the unused memory spaces allocated by some unused variables and some infinite loops. 5. use following wherever necessary. a. unset($var_name); b. mysql_free_result($result_set); — Free result memory c. Look for include("file.php") in loops, by mistake. Just try to free the memory everywhere if the variable / array is no longer used. 6. Best of luck. Function description bool mysql_free_result ( resource $result ) It frees all the memory associated with the result identifier result .

Shell Script

Oct 08, '08

A shell is a command line interpretor. It takes commands and executes them. We can run N no of common commands one after another by putting them in one file( shell script ) in proper order. Creating a simple shell file suppose you want to view the some files in some directory regularly. so you need to use following command: find /path/to/folder/*.ext -mtime 30 -type f -exec ls -lh {} \; This will display all files which are 30 days older from given folder path . we can do this task in shell script as follows #!/bin/sh find /path/to/folder/*.ext -mtime 30 -type f -exec ls -lh {} \; exit 0 _______________________________________________________________ How to create shell script file with vi editor. 1. vi file_name.sh - create the shell file 2. First statement of shell file should be #!/bin/sh - start of shell script 3. write all commands one after another. - all commands to be executed 4.End of shell script - end of shell script exit 0 5.come out of vi editor and run the shell file - run the shell file ./file_name.sh simple................. _______________________________________________________________ Passing value to shell script We can also pass the arguments to our shell script. In our example we are displaying all the files which are modified 30 days before. Now suppose we want to see all the files which are modified 10 days before , then we need to make change in our shell script. To avoid this we can pass the date count to our script from command line. Just go through the sample file given below. e.g. #!/bin/sh clear echo *SCRIPT NAME = $0 echo *No Of Parameters = $# echo *Parameters List = $* echo List of files modified before $1 days. find /path/to/folder/*.ext -mtime $1 -type f -exec ls -lh {} \; exit 0 * echo is used to write output. * $0 gives the script name. * $# gives no of parameter count. * $* gives a string of all parameters to script * Individual argument can be accessed with $1,$2,$3,$4,$5............. $1 for first parameter and so on.. How to execute ./file_name.sh +10 In this case +10 is passed to our shell script as first parameter and thus script runs accordingly.