Archive for the ‘PHP’ Category

Sending html e-mails opens a whole can of worms on the many ways e-mail can be viewed. There is also no guarantee your e-mail will look as intended.

Instead of linking to a remote css file that may be blocked, or prompt the user with a scary ‘prevented external content to load’ error message, we can use PHP to pull the file directly. This adheres to the DRY principle and keeps the code base clean.

Use the file_get_contents function in place of linking a style sheet via an html style element.

I would also recommend a try/catch block in case the file_get_contents command fails.


In head section:

<style type="text/css" media="screen">
	<!-- we do this to embed the file contents into the e-mail.
	<?php echo file_get_contents("../common/css/blueprint/screen.css"); ?>

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Not really a big deal, but could save resources on larger arrays. Is also a clean code practice to avoid awkward traversing array and assigning to ‘itself’ from what is essentially a sub routine.

Does it really matter? Likely not. Using the below script on my 2.66 Core i7 with 8gigs of ram passing by reference is roughly 3-4 times faster. At 100000 array key value pairs the difference is still in microseconds (less than half a millisecond).

More information here: http://php.net/manual/en/language.references.pass.php


// want to loop over an array
$an_array = array();

// lets populate it with random values
for ($i=0; $i < 100000; $i++) { 
	$an_array[$i] = md5(uniqid(uniqid("",true),true));

// start

// now lets maniuplate the 'old' way
foreach ($an_array as $key => $value) {
	// this modifies the value at the index using the array and key
	$an_array[$key] = "ref original array and key";


// lets do it the 'new' way, notice we are passing &
foreach ($an_array as $key => &$value) {
	// $value is a reference to the $an_array[$key]
	$value = "changes source array";
// finish


Sample Executions

Object Pass reference
445 123
455 122
443 122
452 119
446 129

*Note* times in microseconds

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This month’s date range

I noticed that many people search for ‘this month’s date range’. The trick lies in knowing which month you want to go to and that mktime can automatically find the end of the month by passing 0 into the day field.

Well in no short order here it is:

// casting as date object, otherwise it returns a unix timestamp
$first_of_this_month = date('m/d/y',mktime(0,0,0,date('m'),1,date('y')));
$end_of_this_month = date('m/d/y',mktime(0,0,0,date('m')+1,0,date('y')));

// if run on 4/01/11
// outputs
// string(8) "04/01/11"
// string(8) "04/30/11"

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I needed to get last month’s valid date range in php for running reports. A quick google search showed the top results for accomplishing this used for loops that subtracted/added days from now until casting as a date object returned false.

Needless to say, no way am I doing that. So below I have a code snippet that returns the valid start and end date of the previous month. This could be modified in a variety of ways to suit your needs. Needless to say I was disappointed that strtotime did not accept “First day of last month”.

// this returns a date string which I need, but removing the casting as a date
// returns a unix timestamp value more useful for calculations
$first_of_last_month = date('m/d/y',mktime(0,0,0,date('m')-1,1,date('y')));
$end_of_last_month = date('m/d/y',mktime(0,0,0,date('m'),0,date('y')));

// if run on 03/01/11
var_dump($first_of_last_month, $end_of_last_month);
// outputs
// string(8) "02/01/11"
// string(8) "02/28/11"

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