Category

Code Snippets

• Bookmarks, Code Snippets

  Change PHP settings with Apache directives

  2012/01/02 | Permalink | Comment?

  Suppose you have to change some PHP settings for specific projects or directories. Well, you can do so using four useful Apache directives, directly in your Apache configuration files, or even in .htaccess files. To change the value of a boolean directive use the following Apache directive:

  php_flag [directive_name] on|off
  

  To set the value of a non-boolean directive you can use the following Apache directive:

  php_value [directive_name] [value]
  

  Last, you can also use the two following directives, which behaves like the previous two directives, respectively, with a small difference. When you set a value using these directives, you can’t override it in the .htaccess file. And obviously, you can’t use them in that file.

  php_admin_flag [directive_name] on|off
  php_admin_value [directive_name] [value]
  

  For example, if you want to alter the error reporting rules for a specific virtual host, just use something like this in the virtual host configuration:

  php_flag display_errors on
  # Equal to "E_ALL | E_DEPRECATED"
  php_value error_reporting 30719
  

  Finally, remember that you cannot use the various PHP constants. You must use the numerical codes in place of them. E.g. E_DEPRECATED is 8192. Note that you can’t add comments in the same line of the directive: put it before or after! Otherwise Apache will not start up!
  For computing the value of the combination of two or more constants (like in the example above), you can use a PHP script like the following one:

  <?php
  
  echo (E_ALL | E_DEPRECATED); # Prints 30719
  

  Enjoy!

  Share and Enjoy:

  • 
  • 
  • 
  • 
  • 
  • 
  • 
  • 
  • 
  • 
  • 
  • 
  • 

• Code Snippets

  Recursively delete .svn directories

  2011/11/26 | Permalink | Comment?

  Delete recursively all .svn files and folders.

  rm -rf `find . -type d -name .svn`

  via Recursively delete .svn directories.

  Share and Enjoy:

  • 
  • 
  • 
  • 
  • 
  • 
  • 
  • 
  • 
  • 
  • 
  • 
  • 

• Code Snippets

  Fixing the Cant move .svn/tmp/entries to .svn/entries error

  2011/07/31 | Permalink | Comment?

  chflags -R nouchg ./

  via Fixing the Cant move .svn/tmp/entries to .svn/entries error | Arc90 Blog.

  Share and Enjoy:

  • 
  • 
  • 
  • 
  • 
  • 
  • 
  • 
  • 
  • 
  • 
  • 
  • 

• Code Snippets

  JSON correct http header

  2011/02/21 | Permalink | Comment?

  As specified from the RFC4627 the correct header is application/json and not text/json.

  In PHP you can use:

  
  header('Content-type: application/json');
  

  If you need not cache the output, a common problem with GET requests on IE, you can use these lines of code:

  header('Cache-Control: no-cache, must-revalidate');
  header('Expires: Mon, 26 Jul 1997 05:00:00 GMT');
  header('Content-type: application/json');
  

  RFC4627.

  Share and Enjoy:

  • 
  • 
  • 
  • 
  • 
  • 
  • 
  • 
  • 
  • 
  • 
  • 
  • 

• Code Snippets

  Grails UML diagram generation

  2010/05/28 | Permalink | Comment?

  In some IDE (like IDEA) graphic representation of your Grails domain classes is built-in. But if you use another IDE, eg. SpringSource Tool Suite (like me), you can supply this lack with the Class Diagram plugin.

  Installation is really simple: first, check that in your system is installed Graphviz (under Debian/Ubuntu

  sudo apt-get install graphviz

  ) than into your app folder type

  grails install-plugin class-diagram

  Re-run your app and at http://localhost:8080/<your_app>/classDiagram you can see the class diagram generated. The result could look like the following:

  

  Share and Enjoy:

  • 
  • 
  • 
  • 
  • 
  • 
  • 
  • 
  • 
  • 
  • 
  • 
  • 

• Code Snippets

  CSS pseudoclass :hover for IE

  2010/05/26 | Permalink | Comment?

  IE6 and IE7 in quirks mode don’t support :hover pseudoclass for non-anchor (<a>) elements.

  This little css trick can workaround the problem (example on a <tr> element):

  tr { background: #ffffff; hover:expression(this.onmouseover=new Function("this.style.background='#ff0000';"),this.onmouseout=new Function("this.style.background='#ffffff';")); }
  tr:hover { background:#ff0000; }

  First line define background color for generic <tr> element and implement hover behaviour for IE, second line catch hover for standard-compliant browsers.

  Share and Enjoy:

  • 
  • 
  • 
  • 
  • 
  • 
  • 
  • 
  • 
  • 
  • 
  • 
  • 

• Code Snippets

  Wordpress’ database functions

  2010/05/17 | Permalink | Comment?

  A small cheat sheet  of wp’s database functions.

  In your own functions put this line of code to be able to use wp’s db:

  
  global $wpdb;
  

  Get a field

  
  $field = $wpdb->get_var($sql);
  

  Get a single row

  
  $row = $wpdb->get_row($sql);
  

  Get some rows

  
  $rows = $wpdb->get_results($sql);
  

  Escape an input

  
  $value = $wpdb->get_escape($input);
  

  Perform a query

  
  $n = $wpdb->query($sql);
  

  WP Tables’ name
  

  You can use

  • $wpdb->links
  • $wpdb->posts
  • …
  • and even $wpdb->prefix !

  
  $mylink = $wpdb->get_row("SELECT * FROM $wpdb->links WHERE link_id = 10", ARRAY_N);
  

  Return format

  In get_row and get_results you can specify in the second argument the format

  • OBJECT – result will be output as an object.
  • ARRAY_A – result will be output as an associative array.
  • ARRAY_N – result will be output as a numerically indexed array.

  More info

  Function Reference/wpdb Class « WordPress Codex.

  $mylink = $wpdb->get_row("SELECT * FROM $wpdb->links WHERE link_id = 10", ARRAY_N);
  

  Share and Enjoy:

  • 
  • 
  • 
  • 
  • 
  • 
  • 
  • 
  • 
  • 
  • 
  • 
  • 

• Code Snippets

  Wordpress: Change domain

  2010/05/10 | Permalink | Comment?

  You can move a wordpress website to a new domain with the following two steps:

  1. Change all post’s URLs

  
  UPDATE wp_posts SET guid = REPLACE (
  guid,
  'http://exampleoldsiteurl.com',
  'http://examplenewsiteurl.com');
  

  2. Replace the values of ’siteurl’ and ‘home’ in the wp_options table.

  You can do it directly by phpMyAdmin or simply putting this lines of code in the functions.php of the theme:

  
  update_option('siteurl','http://example.com/blog');
  update_option('home','http://example.com/blog');
  

  It is important to execute the previuos code once, then you have to delete this lines.

  The official guide is here: Changing The Site URL « WordPress Codex.

  Share and Enjoy:

  • 
  • 
  • 
  • 
  • 
  • 
  • 
  • 
  • 
  • 
  • 
  • 
  • 

• Code Snippets

  PHP: force file download and set its name

  2010/05/05 | Permalink | Comment?

  PHP offers us the perfect solution to force the download of a file and propose to the user a filename:

  $file ='monkey.gif';
  if (file_exists($file)) {
    header('Content-Description: File Transfer');
    header('Content-Type: application/octet-stream');
    header('Content-Disposition: attachment; filename='.basename($file));
    header'Content-Transfer-Encoding: binary');
    header('Expires: 0');
    header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
    header('Pragma: public');
    header('Content-Length: '. filesize($file));
  
    ob_clean();
    flush();
    readfile($file);
    exit;
  }
  

  via PHP: readfile – Manual.

  Share and Enjoy:

  • 
  • 
  • 
  • 
  • 
  • 
  • 
  • 
  • 
  • 
  • 
  • 
  • 

• Code Snippets

  Count elements in jQuery

  2010/05/02 | Permalink | Comment?

  The method you can use to count the element’s of a jQuery selection is “size()”

  
  $("div.class").size();
  

  So you are able to do

  
  if ($("div.class").size() > 0)
    // Do something
  else
    // Another thing
  

  or whatever you want to do

  Share and Enjoy:

  • 
  • 
  • 
  • 
  • 
  • 
  • 
  • 
  • 
  • 
  • 
  • 
  • 

DevReference.org