Matt Fiddles

Life's so vast, there's just so much to do...

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Officer: "We've analyzed their attack, sir, and there is a danger. Should I have your ship standing by?"

Governor Tarkin: "Evacuate? In our moment of triumph? I think you overestimate their chances."

Where will you go today?

Han Solo: "You said you wanted to be around when I made a mistake, well, this could be it, sweetheart."

Princess Leia: "I take it back."

PHP Notes


List of main variables:

$_SERVER['DOCUMENT_ROOT'] //The server's path that matches

List of constants:

__FILE__  //The path of the current script.
__DIR__   //The directory of the current script.

Dump vars

Use print_r() and var_dump() to show what vars are holding.

And to show what a class has:

$class_methods = get_class_methods('myclass');
// or
$class_methods = get_class_methods(new myclass());
foreach ($class_methods as $method_name) 
    echo "$method_name<br/>";


To see if an array is empty: if (empty($errors)) { code; } <code php> array_key_exists($key, $array); in_array ( mixed $needle , array $haystack [, bool $strict = FALSE ] ); array_search ( mixed $needle , array $haystack [, bool $strict = false ] ); preg_match ( string $pattern , string $subject [, array &$matches [, int $flags = 0 [, int $offset = 0 ]]] ) preg_grep ( string $pattern , array $input [, int $flags = 0 ] ) </code> Use unset() on a loop to remove specific arrays. ===== Functions ===== ==== Date ==== Set the timezone. date_default_timezone_set('America/Los_Angeles'); Some examples $date = date('Y-m-d H:i:s'); 2012-03-06 17:33:07

$today = date("F j, Y, g:i a");     // March 10, 2001, 5:16 pm

A full list of all date strings:

And in OOP

$now = new DateTime(null, new DateTimeZone('America/New_York'));
// $now->setTimezone(new DateTimeZone('Europe/London'));    // Another way
echo $now->getTimezone();

$date = new DateTime('now', new DateTimeZone('America/New_York'));
echo $date->format('d-m-Y H:i:s');

Don't show errors

First. Fix the errors. Error prone code is slow and hurts the site.

But sometimes it's needed. Like using file_get_contents() on a remote site:

Warning: file_get_contents( [function.file-get-contents]: failed to open stream:

That's annoying. Instead use @ on the function to silent it:

// $output is the webpage, fyi
if ($output) {
  echo "The site is up!";
else {
  echo "Um... Houston, we have a problem.";


PHP Error Pages

Serialized Data



$a == $b 	Equal 	        TRUE if $a is equal to $b after type juggling.
$a === $b 	Identical 	TRUE if $a is equal to $b, and they are of the same type.
$a != $b 	Not equal 	TRUE if $a is not equal to $b after type juggling.
$a <> $b 	Not equal 	TRUE if $a is not equal to $b after type juggling.
$a !== $b 	Not identical 	TRUE if $a is not equal to $b, or they are not of the same type.
$a < $b 	Less than 	TRUE if $a is strictly less than $b.
$a > $b 	Greater than 	TRUE if $a is strictly greater than $b.
$a <= $b 	Less than or equal to 	TRUE if $a is less than or equal to $b.
$a >= $b 	Greater than or equal to 	TRUE if $a is greater than or equal to $b.

Other pages

computers/websites/php-notes.txt · Last modified: Nov 2, 2015 (3 years ago) by Matt Bagley