eligeske » PHP

PHP Dynamic Constants

eligeske — Sat, 13 Feb 2010 01:00:03 +0000

This is a way to print out a constant when you need to select the name dynamically.

Haven’t tried it yet, but I am adding because I am sure I will need it in the near future.

$changing_variable = 'foo_bar';
echo constant('FOO_' . strtoupper($changing_variable));

PHP Get Prior Date or Yesterday

eligeske — Mon, 11 Jan 2010 20:15:58 +0000

Here is a quickie to get the date prior to another date. You can make it one, two, 3 days prior. Doesn’t really matter. PHP’s mktime() function self corrects when you put in a day and subtract the number from it.
Yes. Even if it 2010-01-01 it will go return 2009-12-31.

function currWeek()
/**
 * Returns the date one day before the one entered, regardless of year or day of month.
 * Y-m-d
 * @return $dateBefore
 * @param object $mydate
*/
function getDayBefore($mydate){
	$mydate = explode("-", $mydate);
	$myyear 	= $mydate[0];
	$mymonth 	= $mydate[1];
	$myday		= $mydate[2];
	$dateBefore = mktime(0,0,0, $mymonth, $myday-1, $myyear);
	$dateBefore = date('Y-m-d',$dateBefore);
	return $dateBefore;
}

PHP Current Week Number

eligeske — Fri, 18 Dec 2009 17:39:48 +0000

I did not fully test this for every scenario and leap years. But it worked for what I was using it for. If anyone has any bugs with it, let me know.

function currWeek()
{
$dateArray = getdate();
$yday = $dateArray['yday'];
$wday = $dateArray['wday'];
$cMon 	= $yday – $wday;
$currWk = ceil($cMon/7);
return $currWk;
}

Wordpress error in Apache log.

eligeske — Thu, 10 Dec 2009 15:57:08 +0000

This error was driving me nuts.

Error in Apache Log:
[error] [client 127.0.0.1] WordPress database error Table ‘wp_categories’ doesn’t exist for query SELECT cat_name FROM wp_categories WHERE category_nicename = ‘12′ made by require, require_once, include, get_header, locate_template, load_template, require_once, breadcrumbs, referer:

I edited the core files to no end. Of course the last thing I checked after four to five hours of hacking was the breadcrumb plugin by Daniel R Naylor. Because I was sending custom URL Params it was trying to grab the category out of a depecrated table.

FIX: Either use another breadrumb if your going to be using custom URL Parameters or edit the current one.
– comment out this entire elseif statment:
elseif ( !empty($category_name)

That keeps it from looking for that table and will end the errors.

PHP Round Up to Nearest Hundred Function

eligeske — Fri, 13 Nov 2009 22:32:14 +0000

Here is a PHP Quickie!

NEW:

function roundNearestHundredUp($number)
{
return ceil( $number / 100 ) * 100;
}

OLD:

function roundNearestHundredUp($number){
$round = round($number, -2);
if($number > $round){ $round = $round + 100;}
return $round;
}

PHP MySQL functions

eligeske — Sat, 24 Oct 2009 16:27:07 +0000

Connecting to MySQL is pretty simple. There are several different ways of doing it through PHP like MySQLi and PDO. The way I usually do it is creating a mysql class that contains the connect, close, select, insert, and all the other functions readily needed for using PHP and MySQL. Unfortunately some clients that I work with don’t always use PHP 5 or higher.. So here is the way to connect just using functions so that it will work with earlier versions of PHP.

You can assign the database connection properties as variables, contants, or hard coded. Today I am going to pass variables into the function. You could also get much more detailed with it and make error handling if connection fails, but again… not today.

Also below is all the necessary PHP MySQL function. Check em. Good for Reference when not using a framework.

MySQL CONNECT


$link = mysql_connect("DB_HOST", "DB_USER", "DB_PASSWORD") or die(mysql_error());
?>

MySQL CLOSE


mysql_close($link);
?>

MySQL QUERIES


// INSERT
$result = mysql_query("INSERT INTO table(field1, field2) VALUES('value1', 'value2' ) ") or die(mysql_error());
// SELECT
$result = mysql_query("INSERT INTO table(field1, field2) VALUES('value1', 'value2' ) ") or die(mysql_error());
// WHERE
$result = mysql_query("SELECT * FROM table WHERE field1='value1'") or die(mysql_error());
// ORDER BY
$result = mysql_query("SELECT * FROM table ORDER BY fieldName") or die(mysql_error());
// GROUP BY with ORDER BY (NOTE: GROUP BY must come before ORDER BY)
$result = mysql_query("SELECT * FROM table GROUP BY fieldName ORDER BY  fieldName") or  die(mysql_error());
// LIMIT
$result = mysql_query("SELECT * FROM `your_table` LIMIT 0, 10") or die(mysql_error());
// WHERE CONDITIONALS ..more
$result = mysql_query("SELECT * FROM table WHERE field1='value1' OR field2='value2'");
$result = mysql_query("SELECT * FROM table WHERE field1='value1' && field2='value2'");
// COMPARISONS
$result = mysql_query("SELECT * FROM table WHERE field1 LIKE value%");
$result = mysql_query("SELECT * FROM table WHERE field1 NOT LIKE value%");
$result = mysql_query("SELECT * FROM table WHERE field1 LIKE value_");
$result = mysql_query("SELECT * FROM table WHERE field1 LIKE value__");
$result = mysql_query("SELECT * FROM table WHERE field1 LIKE value%");
// SUB QUERY
$result = mysql_query("SELECT * table1 WHERE table2_id IN(SELECT table2_id FROM table2 WHERE data = data )");
?>

MySQL CONDITIONALS

=	equals
<	less than
>	greater than
<=	less than or equal to
>=	greater than or equal to
!=	not equal to
IS NOT NULL	has any value
IS NULL	has no value at all
BETWEEN	within a specified range
NOT BETWEEN	outside a specified range
OR	one of two equations are true
\|\|	same as OR
AND	both equations are true
&&	same as AND
NOT	both equations are false
!	same as NOT

MySQL COMPARISONS

Simple pattern matching

NOT LIKE

Negation of simple pattern matching

%	Matches any number of characters, even zero characters
_	Matches exactly one character

STRCMP()

Compare two strings