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In CodeIgniter, is there a performance disadvantage to loading unecessary libraries, helpers etc?

Tag: php,performance,codeigniter

In creating a log in process in CodeIgniter I have this for the __construct.

 public function __construct() {
      parent::__construct();
      $this->load->library('session');
      $this->load->helper('form');
      $this->load->helper('url');
      $this->load->helper('html');
      $this->load->database();
      $this->load->library('form_validation');

      $this->load->model('login_model');
 }

The index method contains all the necessary code to handle the login.

I am going to set up the log out process and decided instead of creating another controller for the log out I would create a method in the login controller that handles the log out and call it directly.

Obviously the __construct will run when calling the log out method but should I place an if statement in the __construct for items that will not be needed for the log out? For instance not loading the login_model.

This question is not specific to this instance but for overall performance in all the other controllers that I may create and reuse to consolidate code. I am not thinking only about speed but system resources with heavy volume.

Best How To :

The short answer is yes, there is a performance hit for loading anything, so if you don't need it, don't load it.

The longer answer is that you are unlikely to get enough traffic that this is going to be a major factor in the development of the site, but there are other good reasons to not load unnecessary libraries - mainly, to reduce clutter and confusion. When you come back to this function in three months and see what's being loaded, are you going to remember which libraries are needed and which are there "just in case," or will you wind up spending half an hour tracing out the dependencies? At this point you should prioritize ease of development over performance.

In either case, though, don't load libraries that you don't need.

Dynamic creation of objects vs storing them as fields

java,performance,object

There won't be any difference, since you've only changed the scope of the variables. Since you're not using the variables outside of the scope, the generated bytecode will be identical as well (you can try it out with javap). So use the second style for clarity. Edit: In fact if...

php redirection working in chorme but not on firefox

php,google-chrome,mozilla

have you tried using header('location') function? example : <?php if (isset($_POST['putonline'])) { $query = "UPDATE user SET status= '1' WHERE id= '$new_id'"; $result = $cid-> query($query); if ($result== TRUE) { header("location:EidEmp.php"); die(); } else { echo "Failed"; } } ?> Edited : Maybe Change Your header function with javascript function...

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javascript,php

Your PHP is checking if $_POST['submit'] contains a value. Your form does not contain a form element with the attribute name="submit", so therefore it fails and moves straight to the else statement. If you want to check if the form was posted then you should instead check for: if (!empty($_POST))...

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php,ajax,wordpress,woocommerce

Try this: $args = array( 'post_type' => 'product', 'posts_per_page' => 100, 'product_cat' => 'beast-balls', 'orderby' => 'meta_value_num', 'meta_key' => '_price', 'order' => 'asc' ); ...

array and function php

php,arrays

$x and $y are only defined within the scope of the function. The code outside of the function does not know what $x or $y are and therefore will not print them. Simply declare them outside of the function as well, like so: <?php function sum($x, $y) { $z =...

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javascript,php

You are mixing inline PHP with a PHP command (echo). When you are echoing a string, you do it just like normal, this means you can mix literal strings (the js you are manually typing) and the output of functions (like a json in this case): echo "<script type='text/JavaScript'> var...

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php,mysql

You need to join by account_id and also question_id SELECT * FROM `quiz_questions` INNER JOIN `quiz_answers` ON `quiz_questions`.`account_id` = `quiz_answers`.`account_id` AND `quiz_questions`.`question_id` = `quiz_answers`.`question_id` WHERE `quiz_questions`.`account_id` = '1840979156127491' ORDER BY `quiz_questions`.`question_id` ASC LIMIT 5 ...

Codeigniter PHP Mailer, Sender Info

php,email,codeigniter-2,phpmailer,contact-form

Don't do that. It's effectively forging the from address and will fail SPF checks. Instead, use your own address as the From address, and add the submitted address as a reply-to address. In PHPMailer: $mail->From = '[email protected]'; $mail->addReplyTo($POST['emailfrom']); ...

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php

Your local host must be Windows, that doesn't differentiate between upper and lower case in file names and your web server Unix Based which does, simple as that.

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php,jquery,ajax,json

Try: $.ajax({ url: "functions.php", dataType: "JSON", data: {id: id}, type: 'POST', success: function(json){ for(var i=0;i<json.length;i++){ alert(json[i].fname); } } }); ...

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php,composer-php,autoload

autoload should be moved out of require-dev: { "require-dev":{ "phpunit/phpunit":"4.5.*" }, "autoload":{ "psr-0":{ "Yii\\":"yii-1.1.14.f0fee9/" } } } You can test your composer.json file using composer validate. Your original file returned: ./composer.json is invalid, the following errors/warnings were found: require-dev.autoload : invalid value, must be a string containing a version constraint...

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php,mysql,pdo

I don't know the source of the array $arr = array();, but it is assigned to null before the insert query. So it means, literally you are inserting nothing into the database. So check your array well, maybe it was to be like $arr = array('name'=>'My Name', 'url'=>'url', 'email'=>'my email',...

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php,html,mysql,table,data

Note: You can just make a single file out of it to achieve your wanted output Use mysql_real_escape_string() to sanitize the passed-on value to prevent SQL injections You should use mysqli_* instead of the deprecated mysql_* API Form them in a single file like this (display.php): <html> <form method="post" name="display"...

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php,regex

$pattern = '! ^ # start of string \d{5} # five digits [[:alpha:]]{2} # followed by two letters - # followed by a dash \d{2} # followed by two digits $ # end of string !x'; $matches = preg_match($pattern, $input); ...

compare today's date with unix timestamp value in database

php,mysql

If I understand correctly you have a unix timestamp in a varchar field and you can't change this. If you compare the unix timestamp directly you will only get results that match the exact second of the timestamp. You can use FROM_UNIXTIME() to convert the timestamp in a date value...

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php,codeigniter,pagination

in config.php $config['base_url'] = ''; $config['index_page'] = ''; in your router $route['news/(:any)'] = 'news/$1'; $route['news'] = 'news'; $route['default_controller'] = 'news/create'; $route['(:any)'] ='pages/view/$1'; and place .htaccess <IfModule mod_rewrite.c> RewriteEngine On RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule ^(.*)$ index.php/$1 [L] </IfModule> EDIT 01 <?php $data['title'] = 'Database Details'; $count = $this->news_model->record_count()...

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javascript,php,jquery,ajax,parsley.js

Make sure this line: $('#remarks').parsley( 'addConstraint', { minlength: 5 }); is called before you check isValid()....

RecursiveIteratorIterator to fetch subdirectories

php

I would change if ( $dir->isDir() ) to if ( $dir->isDir() && $dir != $root) to remove the root directory...

PHP Regular Expressions Counting starting consonants in a string

php,regex

This is one way to do it, using preg_match: $string ="SomeStringExample"; preg_match('/^[b-df-hj-np-tv-z]*/i', $string, $matches); $count = strlen($matches[0]); The regular expression matches zero or more (*) case-insensitive (/i) consonants [b-df-hj-np-tv-z] at the beginning (^) of the string and stores the matched content in the $matches array. Then it's just a matter...

Mixing

php

Set short_open_tag=On in php.ini And restart your Apache server...

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php,laravel,interface,namespaces

In my recent laravel 5 project, I'm used to prepare my logics as Repository method. So here's my current directory structure. For example we have 'Car'. So first I just create directory call it libs under app directory and loaded it to composer.json "autoload": { "classmap": [ "database", "app/libs" //this...

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php,linux,apache,logging,permissions

I'd simply set its owner to apache user. This will give you the name of apache user : ps aux | grep httpd In my case (CentOS), it's 'apache' but sometimes it's 'www-data'... chown apache:apache /var/log/httpd/php_errors.log chmod 600 /var/log/httpd/php_errors.log ...

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php,wordpress,woocommerce

<?php if ( sizeof( $woocommerce->cart->cart_contents ) == 0 ) { // The cart is empty } else { ?> <div class="header-cart-inner"> <a class="cart-contents" href="<?php echo WC()->cart->get_cart_url(); ?>" title="<?php _e( 'View your shopping cart' ); ?>"><?php echo sprintf (_n( '%d item', '%d items', WC()->cart->cart_contents_count ), WC()->cart->cart_contents_count ); ?> - <?php echo...

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php,wordpress,woocommerce

Try this : global $post; $terms = get_the_terms( $post->ID, 'product_cat' ); foreach ($terms as $term) { echo $term->name .' '; $thumbnail_id = get_woocommerce_term_meta( $term->term_id, 'thumbnail_id', true ); $image = wp_get_attachment_url( $thumbnail_id ); echo "'{$image}'"; } ...

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php,sql-server,pdo,odbc,sqlsrv

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javascript,php,wordpress

Try wp_logout() function use the funtion . if($_GET['logout'] == 1) { ob_start(); error_reporting(0); wp_logout(); $redirect = wp_logout_url(); wp_safe_redirect( $redirect ); } ...

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php,cakephp

You will want to setup a custom validation rule for testing that the 'full name' is unique. For example, in your model add a new method for validation like this:- public function validateUniqueFullName(array $data) { $conditions = array( 'first_name' => $this->data[$this->alias]['first_name'], 'last_name' => $this->data[$this->alias]['last_name'] ); if (!empty($this->id)) { // Make...

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php,symfony2,rss

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php,codeigniter,calendar

If you want to show all four boxes for the dates which has data, try to change the get_calendar_data() foreach as below, $content = ""; $lastDay = -1; $index = 0; foreach ($query->result() as $row) { if($lastDay != intval(substr($row->date_cal, 8, 2))){ if($index > 0 ){ if($content != ''){ $cal_data[$lastDay] =...

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php,forms,symfony2,runtime-error

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php,html,select,drop-down-menu

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php,mysql

No need to use union as it will give a lots of duplicate data What you want to achieve can be done with simple left join or inner join SELECT m.issue_name ,m.issue_type , m.priority ,m.status,m.description , m.start_date,m.end_date,m.duration, s.name as server_name,p.name as product_name from mod_networkstatus as m LEFT JOIN tblservers as...

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php,time

<?php $duration="1H10M5S"; $display=str_replace(array('H','M','S'), array(' Hour(s) ',' Minute(s) ',' Seconds'), $duration); echo $display; Output 1 Hour(s) 10 Minute(s) 5 Seconds Fiddle...

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php,laravel,laravel-5

Actually, you should reserve in config/app.php file. Then, you can add In the Service Providers array : 'Menu\MenuServiceProvider', In the aliases array : 'Menu' => 'Menu\Menu', Finally, you need to run the following command; php artisan dump-autoload I assume that you already added this package in composer.json Sorry, I didn't...

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php,session,e-commerce,checkout

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mysql,performance,explain

Except for trivial queries, there is no way to know if you have the optimal query & indexes. Nor can you get a metric for how well designed the schema and application are. 3 seconds on a cold system for a 3-way JOIN with "Rows" of 409, 45, 1 is...

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php,security

As @Darkbee stated, the simplest way is to have the file outside your website root. This would be accessible on the server, but not to the public under any circumstances. The alternative is to set the permissions to 400 on the file. .htaccess could block access, but not blocking access...

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php,codeigniter,validation

You done need to do anything with your controller. Add this change your view to <script> function calculate() { var myBox1 = document.getElementById('crop_quantity').value; var myBox2 = document.getElementById('per_rate').value; var result = document.getElementById('income_amount'); var myResult = myBox1 * myBox2; result.value = myResult; } window.onload = calculate(); </script> <div class="control-group"> <label class="control-label">Crop Quantity</label>...

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php,database,mysqli

$query = "INSERT INTO `myDatabaseForAll`.`users` (`id`, `firstname`, `lastname`, `username`, `password`) VALUES (NULL, $firstname, $lastname,$username,$password)"; you need single quote around text feilds in sql queries change above query to $query = "INSERT INTO `myDatabaseForAll`.`users` (`id`, `firstname`, `lastname`, `username`, `password`) VALUES (NULL, '$firstname', '$lastname','$username','$password')"; ...

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php,sql,database

change $username = "'rylshiel_order"; to $username = "rylshiel_order"; and you should be through. You are passing on an extra single quote here. ...

$http.get returns actual php script instead of running it (yeoman, grunt)

php,angularjs,pdo,gruntjs

Change $http.get('/scripts/php/articles.php') to $http.get('http://YOURDOMAIN.COM/scripts/php/articles.php') Off course you need to replace YOURDOMAIN.COM with localhost or any other domain you are using....

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php,email,laravel,laravel-4

Closures work just like a regular function. You need to inject your outer scope variables into function's scope. Mail::send('invoices.mail', array($pinvoices,$unpinvoices), function($message) use ($email) { $message->to($email , 'Name')->subject('your invoices '); }); ...

How to pass a value from a page to another page in PHP

php

Only values that are sent by a form will be in the GET or POST array. From what you are showing I conclude that you don't want to show the field in your form, so make it hidden. Add this inside your form tag: <input name="price" type="hidden" value="'.$price.'" class="inputClass"> Also,...

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php,mysql,mysqli,sql-injection,sql-insert

In the New PHP code snippet, you are still vulnerable to injections. You are using a prepared statement in the insert part, but you are not actually using the preparations strengths correctly. When creating a prepared statement, you create a query in which you add placeholders instead of the raw...

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javascript,php,jquery,html,css3

Ok, so i tried to decypher what you meant with your Question. To Clarify: He has this one page setup. inside the div Our Project, there are two Buttons or links Visit more. When clicked, he wants the About Section to be shown. All in all it is impossible for...

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php,image-processing,imagemagick

I think you can locate the shape pretty accurately with a simple threshold, like this: convert image.jpg -threshold 90% result.jpg and you can then do a Canny edge detection like this: convert image.jpg -threshold 90% -canny 0x1+10%+30% result.jpg The next things I would be looking at are, using the -trim...

Rewrite url not working in htaccess

php,apache,.htaccess,mod-rewrite,url-rewriting

QUERY_STRING is only used to match query string without URI. You need to use: Options -MultiViews RewriteEngine On RewriteBase /mywbsite/ RewriteCond %{THE_REQUEST} /search_data\.php\?keywords=([^&]+)&f=([^\s&]+) [NC] RewriteRule ^ search/%1/%2? [R=301,L] RewriteRule ^search/([^/]+)/([^/]+)/?$ search_data.php?keywords=$1&f=$2 [QSA,L,NC] ...

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php,mysql,image

This looks like a job for glob, which returns an array of file names matching a specified pattern. I'm aware of the other answer just posted, but let's provide an alternative to regex. According to the top comment on the docs page, what you could do is something like this:...

mysql_real_escape_string creates \ in server only not in local

php,sql

Your server has magic quotes enabled and your local server not. Remove it with the following sentence set_magic_quotes_runtime(0) As this function is deprecated and it will be deleted in PHP 7.0, I recommend you to change your php.ini with the following sentencies: magic_quotes_gpc = Off magic_quotes_runtime = Off If you...

Include both local and server at the same time

php

file_exists: http://php.net/manual/en/function.file-exists.php is_dir: http://php.net/manual/en/function.is-dir.php Best way to do that is use dirname(__FILE__) which gets the directory's full path of the current file in ether unix of windows format. Then we use realpath() which conveniently returns false if file does not exist. All you have to do is specify a relative...