PHP: Displaying errors in the browser

Posted by & filed under PHP, Programming.

I run into this from time to time, and there are a few options for getting errors to display in browser when the server configuration is preventing it. .htaccess and php.ini can both be modified to allow this to happen. I have found a simpler way is to enable them via PHP:

 

 

Stripping trailing periods from a URL with .htaccess

Posted by & filed under Programming, Web Development.

I recently had a client of mine have a link to their website published in a online newspaper. The paper typo’d the URL and tacked a trailing . to the end of the HREF. A quick .htaccess edit resolved the issue:

.htaccess and Windows — oh noes!

Posted by & filed under Server Admin.

Windows sucks. But sometimes I have to deal with an even bigger abomination — Linux software on a Windows boxen! Today I had to get a .htaccess file working, and since unix paths can get a bit tricky on windows, I figured I’d jot down the steps:

In the htaccess.conf we need to do the following:

  1. Enable mod_rewrite in the LoadModule section
  2. Set “AllowOverride All”

I was using vhosts in this instance, so I needed to add the following to the appropriate <VirtualHost> section:

So now the entire <VirtualHost> block looks like:

Lastly, my .htaccess file is pretty much setup like normal:

The .htpasswd file can be generated using htpasswd — Apache packages the htpasswd in the bin directory. It will likely be somewhere like: C:\Program Files\Apache Software Foundation\Apache2.2\bin

Toss the resulting file int he path defined by AuthUserFile in the .htaccess file and you are done!

.htaccess Notes

Posted by & filed under Uncategorized.

Quick notes on configuring password auth via .htaccess:

  • Step 1: Create the directory area and set permissions to read the area
  • Step 2: Create a file called .htaccess in the directory you want to protect
    In that file: 

    AuthUserFile /your/directory/here/.htpasswd
    AuthGroupFile /dev/null
    AuthName "Secure Document"
    AuthType Basic
    require valid-user

  • Step 3: Create a file called .htpasswd in the directory as set in the AuthUserFile directive in the .htaccess file
    You create this file by typing in the information below, at the system prompt, in the directory area to be protected: 

    htpasswd -c .htpasswd username

Configuring Yii to exclude index.php in the URL

Posted by & filed under PHP, Programming.

First of all, mod_rewrite needs to be enabled, and Apache configured to allow the use of .htaccess files (AllowOverride).

Secondly .htaccess in the root of the Yii app should be as such:


Options +FollowSymLinks
IndexIgnore */*
RewriteEngine on
RewriteBase /

# if a directory or a file exists, use it directly
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d

# Or just forward to index.php
RewriteRule . index.php

As a note, RewriteBase needs to be changed if the Yii app is located in a directory other than the site’s root.

.htaccess Cheat Sheet

Posted by & filed under Uncategorized.

Here is a simple cheatsheet for the .htaccess file:

Enable Directory Browsing

Options +Indexes
## block a few types of files from showing
IndexIgnore *.wmv *.mp4 *.avi

Disable Directory Browsing

Options All -Indexes

Customize Error Messages

ErrorDocument 403 /forbidden.html
ErrorDocument 404 /notfound.html
ErrorDocument 500 /servererror.html

Get SSI working with HTML/SHTML

AddType text/html .html
AddType text/html .shtml
AddHandler server-parsed .html
AddHandler server-parsed .shtml
# AddHandler server-parsed .htm

Change Default Page (order is followed!)

DirectoryIndex myhome.htm index.htm index.php

Block Users from accessing the site

order deny,allow
deny from 202.54.122.33
deny from 8.70.44.53
deny from .spammers.com
allow from all

Allow only LAN users

order deny,allow
deny from all
allow from 192.168.0.0/24

Redirect Visitors to New Page/Directory

Redirect oldpage.html www.domainname.com/newpage.html
Redirect /olddir www.domainname.com/newdir/

Block site from specific referrers

RewriteEngine on
RewriteCond %{HTTP_REFERER} site-to-block\.com [NC]
RewriteCond %{HTTP_REFERER} site-to-block-2\.com [NC]
RewriteRule .* – [F]

Block Hot Linking/Bandwidth hogging

RewriteEngine on
RewriteCond %{HTTP_REFERER} !^$
RewriteCond %{HTTP_REFERER} !^http://(www\.)?mydomain.com/.*$ [NC]
RewriteRule \.(gif|jpg)$ – [F]

Want to show a “Stealing is Bad” message too?

Add this below the Hot Link Blocking code:

RewriteRule \.(gif|jpg)$ www.mydomain.com/dontsteal.gif [R,L]

Stop .htaccess (or any other file) from being viewed


order allow,deny
deny from all

Avoid the 500 Error

# Avoid 500 error by passing charset
AddDefaultCharset utf-8

Grant CGI Access in a directory

Options +ExecCGI
AddHandler cgi-script cgi pl
# To enable all scripts in a directory use the following
# SetHandler cgi-script

Password Protecting Directories

Use the .htaccess Password Generator and follow the brief instructions!

Change Script Extensions

AddType application/x-httpd-php .gne

gne will now be treated as PHP files! Similarly, x-httpd-cgi for CGI files, etc.

Use MD5 Digests

Performance may take a hit but if thats not a problem, this is a nice option to turn on.

ContentDigest On

The CheckSpelling Directive

From Jens Meiert: CheckSpelling corrects simple spelling errors (for example, if someone forgets a letter or if any character is just wrong). Just add CheckSpelling On to your htaccess file.

The ContentDigest Directive

As the Apache core features documentation says: “This directive enables the generation of Content-MD5 headers as defined in RFC1864 respectively RFC2068. The Content-MD5 header provides an end-to-end message integrity check (MIC) of the entity-body. A proxy or client may check this header for detecting accidental modification of the entity-body in transit.

Note that this can cause performance problems on your server since the message digest is computed on every request (the values are not cached). Content-MD5 is only sent for documents served by the core, and not by any module. For example, SSI documents, output from CGI scripts, and byte range responses do not have this header.”

To turn this on, just add ContentDigest On.

Enable Gzip – Save Bandwidth

# BEGIN GZIP

# Combine the below two lines – I’ve split it up for presentation
AddOutputFilterByType DEFLATE text/text text/html text/plain text/xml text/css
application/x-javascript application/javascript

# END GZIP

Turn off magic_quotes_gpc

# Only if you use PHP

php_flag magic_quotes_gpc off

Set an Expires header and enable Cache-Control


ExpiresActive On
ExpiresDefault “access plus 1 seconds”
ExpiresByType text/html “access plus 7200 seconds”
ExpiresByType image/gif “access plus 518400 seconds”
ExpiresByType image/jpeg “access plus 518400 seconds”
ExpiresByType image/png “access plus 518400 seconds”
ExpiresByType text/css “access plus 518400 seconds”
ExpiresByType text/javascript “access plus 216000 seconds”
ExpiresByType application/x-javascript “access plus 216000 seconds”


# Cache specified files for 6 days

Header set Cache-Control “max-age=518400, public”

# Cache HTML files for a couple hours

Header set Cache-Control “max-age=7200, private, must-revalidate”

# Cache PDFs for a day

Header set Cache-Control “max-age=86400, public”

# Cache Javascripts for 2.5 days

Header set Cache-Control “max-age=216000, private”

Detect iPhone Clients

Posted by & filed under iPhone, PHP.

In PHP:

  1. <?php if (strpos($_SERVER[‘HTTP_USER_AGENT’], ‘iPhone’) !== FALSE)
  2. { header(‘Location: http://labs.bluemetalcorp.com/iphone/’); }
  3. ?>

.htaccess:

  1. RewriteEngine on
  2. RewriteCond ${HTTP_USER_AGENT} iPhone
  3. RewriteRule .* http://labs.bluemetalcorp.com/iphone/