Nisi's work blog » Website’s

How to disable comments notification for WordPress

admin — Mon, 21 Nov 2011 08:43:00 +0000

Do you receive alot of emails sent by your WordPress Blog becouse people comment your posts?

You can turn this off like this:

1. Login to your blog admin page

2. Click on Settings -> Discussion

3. Search in that list for “E-mail me whenever:”

Now by default you receive email when “Anyone posts a comment” and “A comment is held for moderation“. Uncheck any or both of this options as you like.

You should definitely uncheck “Anyone posts a comment”.

Unable to find the wrapper “https”

admin — Sat, 29 Oct 2011 05:07:44 +0000

Today I had to put a simple script on one of my hosting server where a “Facebook Login” button was available for login. However when I had to run it I encountered the following error:

Warning: file_get_contents() [function.file-get-contents]: Unable to find the wrapper “https” – did you forget to enable it when you configured PHP?

This was becouse the url served to file_get_contents start with http:// ….

If you have the same problem there are 2 steps to rezolve it:

apache module ssl_module need to be avilble
php extension php_openssl need to be activated too

Server restart and you are good to go.

To test from PHP is extension php_openssl is active just paste this code:

if (extension_loaded(‘php_openssl’))
echo(‘php_openssl ok’);
else
echo(‘php_openssl off’);

$_FILES limitation when uploading files in PHP

admin — Fri, 14 Oct 2011 09:10:01 +0000

Along with the “upload_max_filesize” when uploading files with PHP there is another parameter named “max_file_uploads” witch prevent uploading more files that the value of this parameter.

Default size of this parameter is 20 and is should be enough for more apps then I can count but today I had to repair a bug in a page where a form contain 30 file uploads and just 20 were availble in $_FILES from php script.

How can you change this?

There are 2 methods. One is to change it from php.ini but not always you can access php.ini file

The second method is not using ini_set :( . Tried that and not working.

I did find another method witch need some javascript. The method is when submiting the form a javascript will disable all unused upload elements like this:

jQuery("#upload_files1").submit(function(){
jQuery(‘input:file[value=""]‘).attr("disabled", true);
});

and the form:

How to use call_user_func_array with a simple function and with class methods

admin — Sat, 28 May 2011 11:49:58 +0000

In this post you will see a example of using call_user_func_array (from PHP) to call a simple function, a public static method from a class and a public method.

First I define one function and one class:

function add($p1, $p2){
return $p1 + $p2;
}
class CSimpleMath{
function __construct($v1) {
}
public static function multiply($a, $b){
return $a * $b;
}
public function substract($a, $b){
return $b – $a;
}
function __destruct() {
}
}

Maybe you notice that in the class I did inserted a construct and destruct functions. You dont realy need them for this example to work but I always include them when I write a class.

Call a simple function with call_user_func_array:

echo call_user_func_array(‘add’, array(2, 5));

Call a public static method:

echo call_user_func_array(‘CSimpleMath::multiply’, array(2, 5));

Call a public class method

call_user_func_array(array(‘CSimpleMath’, ‘substract’), array(2, 5));

“Progress bar” for long running cron scripts in PHP

admin — Thu, 12 May 2011 13:43:54 +0000

Long running scripts can be a pain if you dont know how much will be running. If you need to see a progress and flush() or ob_flush() do not work becouse of browser cache you can implement an “email progress bar”.

PHP example:

$step = 0;
$last_percent = 0;
$total_rows =
while(1) {
$step++; //count step
// here should be is the code witch consume time for every loop
// end consuming time code
$procent = ($step * 100) / $total_rows;
if ($last_percent != round($procent)){
// becouse you do not want to receive an email for every step
$last_percent = round($procent);
if (($last_percent % 10) == 0){
// this will send email from 10 % to 10 % – total 10 emails
mail(your_email_here, ‘Progress ‘.$last_percent.‘% done’ , "Progress: ".$contor."/".$total_rows);
}
}
} // end while

As you can see the ideea is very simple and you can implement it in any language.

How to replace substring in MySQL table field

admin — Fri, 11 Mar 2011 12:30:34 +0000

This replace will search in every row of the table where condition from WHERE is true and replace function will replace all instances in a string.

ex. if you have text “hello world” and you want to replace the “o” letter with “*” this will will transform the text in “hell* w*rld”

UPDATE `mytable`
SET my_content = REPLACE(content, ‘substr_string_to_replace’,‘the_new_string’)
WHERE INSTR(content, ‘substr_string_to_replace’) > 0;

PHP: trim spaces in the middle of a string

admin — Mon, 14 Feb 2011 11:29:04 +0000

When you let users input text in a textfield or input box iti is always a good ideea to use trim function to remove spaces form the begining or the end of the string.

Today I needed a function to trim spaces from the middle of a string and replace with a single space.

/*
this will return the string where groups of consecutive spaces
are collapsed in a single space
eg. $str = "This is my test string";
function will output "This is my test string"
*/
function centerTrim($str){
return preg_replace("/\s+/", " ", $str)
}

if you need to remove all spaces you can use this function:

/*
eg. $str = "This is my test string";
function will output "Thisismyteststring"
*/
function centerTrim2($str){
return preg_replace("/\s+/", "", $str)
}

MySQL: Select “last month” records

admin — Fri, 04 Feb 2011 12:27:21 +0000

In order to select last month records you have to get first dai of the last month and the last day of the first month.

Remember that current month could be January and the last month will in another year.

Finding first day of the last month:

DATE_FORMAT(CURRENT_DATE – INTERVAL 1 MONTH, "%Y-%m-01")

Finding the last thay of the last month:

LAST_DAY(CURRENT_DATE – INTERVAL 1 MONTH)

And the final Query is:

SELECT *
FROM `my_table`
`DATE` BETWEEN DATE_FORMAT(CURRENT_DATE – INTERVAL 1 MONTH, "%Y-%m-01") AND LAST_DAY(CURRENT_DATE – INTERVAL 1 MONTH)

MySQL: select “this month” records

admin — Fri, 04 Feb 2011 12:20:18 +0000

Where “date” column is a Date type in “my_table”

SELECT *
FROM `my_table`
WHERE YEAR(`DATE`) = YEAR(CURDATE()) AND MONTH(`DATE`) = MONTH(CURDATE())

MySQL: Select last 7 days records

admin — Fri, 04 Feb 2011 12:14:37 +0000

For this example I use this table model:

ID	Name	Date
1	Jon Dow	2011-01-10
2	Jane Dow	2011-01-10
…	…	…

SELECT *
FROM `my_table`
WHERE `DATE` BETWEEN DATE_ADD(CURDATE(), INTERVAL -5 DAY) AND CURDATE()