<?php

include ('inc/connect.php');
//define the table that you want to pull data from
$table = "table_name";
//define the variables for your query
$query_variables = $_POST['id'];
//build your dynamic query
$query = "SELECT * FROM `".$table."` WHERE ".$query_variables."";
$result = mysql_query("SHOW COLUMNS FROM ".$table."");
$i = 0;

if (mysql_num_rows($result) > 0) {

while ($row = mysql_fetch_assoc($result)) {
$csv_output .= $row['Field'].", ";
$i++;
}
}
$csv_output .= "\n";
$values = mysql_query("$query");

while ($rowr = mysql_fetch_row($values)) {

for ($j=0;$j<$i;$j++) {
$csv_output .= $rowr[$j].", ";
}
$csv_output .= "\n";
}
$filename = $file."_".date("Y-m-d_H-i",time());
header("Content-type: application/vnd.ms-excel");
header("Content-disposition: csv" . date("Y-m-d") . ".csv");
header( "Content-disposition: filename=".$filename.".csv");
print $csv_output;
exit;
?>

<?php
//Generate Random String
function generateCode($numchars=5,$digits=1,$letters=1)
{
$dig = "012345678923456789";
$abc = "ABCDEFGHJKLMNOPQRSTUVWXYZ";

if($letters == 1)
{
$str .= $abc;
}

if($digits == 1)
{
$str .= $dig;
}

for($i=0; $i < $numchars; $i++)
{
$randomized .= $str{rand() % strlen($str)};
}

return $randomized;
}
$code = generateCode('5','0','1');
echo $code;
?>

The problem is that there is no leading zero for the month, so using substr function and counting 2, 2 and 4 won’t work in every situation. Here’s what I did to create a human readable date (03/29/1982) as well as a UNIX time variable.

The Functions

For this conversion I’m going to use three functions - substr, str_replace and strtotime. Here’s a quick breakdown of how they work.

substr ( string $string , int $start [, int $length ] ) – this returns a portion of the string based on the start and length parameters. You can use negative numbers for the start to pull from the end of the string, which is what we’ll be doing.

str_replace ( mixed $search , mixed $replace , mixed $subject) – this function will return a string or an array with all occurences of the search parameter in the subject parameter replaced with the replace parameter.

strtotime ( string $date ) – this function takes a US English date format and will parse it into a UNIX timestamp.

Down to Business

// Takes a date (11222009) and returns 11/22/2009
function fix_date($sale_date)
{
	$sale_date_year = substr ($sale_date, -4);
	$sale_date_day = substr ($sale_date, -6, 2);
	$string_to_replace = $sale_date_day . $sale_date_year;
	$sale_date_month = str_replace($string_to_replace,'',$sale_date);
	$sale_date_clean = "$sale_date_month/$sale_date_day/$sale_date_year";
	if ($sale_date_clean == "//") {$sale_date_clean = NULL;}

	return $sale_date_clean;
}

I pulled the sale date from the database and created the $sale_date variable out of it. For this example lets suppose that $sale_date = 3291982.

Let’s Breakout the Year

Next, I figured that the last 4 digits will always be the year. I was able to create a variable from them using the substr function that’s provided by PHP. What this function is doing is telling it to take the $sale_date and take the last 4 numbers off the end (-4)for a total of 4 numbers (4).

$sale_date_year = substr ($sale_date, -4, 4);

So at this point $sale_date_year = 1982.

Getting the Day of the Month

The next step was to strip out the day of the month using the same substr function – this time telling it to take 6 numbers from the end (-6) for a total of 2 numbers (2).

 $sale_date_day = substr ($sale_date, -6, 2);

This function will return $sale_date_day = 29.

Now for the Tricky Part…

I’m going to combine the 2 new variables together to create a string to use as my replace variable to use the str_replace function.

$string_to_replace = $sale_date_day . $sale_date_year;

At this point $string_to_replace = 291982. I’m going to use this in the str_replace function to get the month from the $sale_date variable.Here’s the function -

$sale_date_month = str_replace($string_to_replace,'',$sale_date);

This will return $sale_date_month = 3

Creating a User-Friendly Date

The next step is to create a human readable date. To this, I simply combine all the separate variables into one variable, separated with a slash.

$sale_date_clean = "$sale_date_month/$sale_date_day/$sale_date_year";

The $sale_date_clean will now look like this – 3/29/1982.

Make the Pretty Date into a UNIX Timestamp

The final step will be to take the $sale_date_clean that we just created and make it into a UNIX timestamp. We’ll use the strtotime function of this.

$unix_date = strtotime($sale_date_clean);

At this point we have 2 clean variables to do whatever you want with.

Hopefully you’ve found this quick tutorial valuable. Contact me if you have any questions or would do it a different way. There’s 1,001 ways to do everything – that’s why I love coding.

This is useful when you are given prices as varchar or text with the dollar sign already included in the field. We’re going to start with an array of numbers, in this case we’ll use the array(‘$1256.45′,’$5564.75′,’$7895.33′).

Here is the foreach loop running:

Start with $1256.45
Strip the $ – 1256.45
Cleaned and formatted number with the dollar sign added back in as a character – $1,256.45

Start with $5564.75
Strip the $ – 5564.75
Cleaned and formatted number with the dollar sign added back in as a character – $5,564.75

Start with $7895.33
Strip the $ – 7895.33
Cleaned and formatted number with the dollar sign added back in as a character – $7,895.33

Here’s the code that performs the task above:

 <?php 
$number_array = array('$1256.45','$5564.75','$7895.33');

foreach ($number_array as $number) {
echo "Start with $number<br/>";
$number = str_replace('$','',$number);
echo "Strip the $ - $number<br/>";
$formatted_number = number_format($number, 2, '.',',');
echo "Cleaned and formatted number with the dollar sign added back in - <strong>$$formatted_number</strong><br/><br/>";
}
?>

Simple Percent off a Price Using PHP and Simple Math

The next thing we’ll do is take our newly formatted numbers and perform a simple calculation to get a percentage off.

We will use the price 1234.67 as our starting price and 45% off as the discount rate.

Here is the foreach loop running:

starting price is $1234.67
45% off of $1234.67 = $555.60
$1234.67 – $555.60 will equal $679.07 – the final sale price

 <?php
$price = 1234.67;
$percent_off = .45;
echo "starting price is $$price<br/>";
$money_off = $price * $percent_off;
$money_off = number_format($money_off, 2, '.',',');
echo "45% off of $$price = $$money_off<br/>";
$sale_price = $price - $money_off;
$sale_price = number_format($sale_price, 2, '.',',');
echo "$$price - $$money_off will equal $$sale_price - the final sale price";
?>

Here is an example of one of the shorter titles I was given:

Here is an example of one of the longer titles I was given:

A series of quick if/else statements and use of the strlen function in PHP allows me to assign different classes depending on the length of the dynamic title. I figured out, based on the CSS on the H1 class, that 14 was my magic number.

Here’s the quick snippet of code I used:

$title = $post->post_title;
$char_title = strlen($title);

if ($char_title > 14) {$header_style = "double";}

else {$header_style = "single";}

I grab the post title using common WordPress calls and make it into the $title variable. The I use the strlen function to determine the number of characters (including spaces) in the title. If it’s greater than 14, it assigns the $header_style variable the class “double” or else it assigns it the “single” class.

Here is how I used it within the WordPress loop:

<?php if (have_posts()) : while (have_posts()) : the_post(); ?>
<div class="<?php echo $header_style ?>"><h2><?php the_title(); ?></h2></div>
<?php endwhile; endif; ?>

Hopefully you’ve found this quick tutorial valuable. Contact me if you have any questions or would do it a different way. There’s 1,001 ways to do everything – that’s why I love coding.