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Determine if variable is defined in Python [duplicate]
...eleted. I'm looking for something like defined() in Perl or isset() in PHP or defined? in Ruby.
6 Answers
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How to enable mod_rewrite for Apache 2.2
...NAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
The above .htaccess file (if placed in your DocumentRoot) will redirect all traffic to an index.php file in the DocumentRoot unless the file exists.
So, let's say you have the following directory ...
How can I get the last 7 characters of a PHP string?
...r for the 2nd argument.
$newstring = substr($dynamicstring, -7);
From the php docs:
string substr ( string $string , int $start [, int $length ] )
If start is negative, the returned string will start at the start'th character from the end of string.
...
Overriding class constants vs properties
... and always refers to the class it is being executed in. If you are using php5.3+ you might try static::TEST as static:: is inheritance-aware.
The difference is that static:: uses "late static binding". Find more information here:
http://php.net/manual/en/language.oop5.late-static-bindings.php
...
Instagram how to get my user id from username?
...API, one can examine the Instagram userpage to get the id. Example code in PHP:
$html = file_get_contents("http://instagram.com/<username>");
$doc = new DOMDocument();
$doc->loadHTML($html);
$xpath = new DOMXPath($doc);
$js = $xpath->query('//body/script[@type="text/javascript"]')->...
Display an array in a readable/hierarchical format
...
<?php foreach($data[0] as $child) { echo $child . "<br />"; }?> this worked great thanks Brian !
– Xavier
Mar 22 '11 at 14:58
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MySQL “WITH” clause
... a feature request for MySQL since January 2006: http://bugs.mysql.com/bug.php?id=16244
Other RDBMS products that support common table expressions:
Oracle 9i release 2 and later:
http://www.oracle-base.com/articles/misc/with-clause.php
Microsoft SQL Server 2005 and later:
http://msdn.microsoft.com/...
Why doesn't this code simply print letters A to Z?
...
From the docs:
PHP follows Perl's convention when dealing with arithmetic operations on character variables and not C's.
For example, in Perl 'Z'+1 turns into 'AA', while in C 'Z'+1 turns into '[' ( ord('Z') == 90, ord('[') == 91 ).
Note th...
Safe characters for friendly url [closed]
...ct is fairly straightforward: [...] params.toString() // "key=730d67"" (3) PHP Manual, http-build-query: "Generate URL-encoded query string. [...] The above example will output: 0=foo&1=bar[...]" (4) J. Starr, Perishable Press: "When building web pages, it is often necessary to add links that re...
Can I store images in MySQL [duplicate]
...ation. I want it that for each image, there should be a thumb created with PHP (which is not that difficult). I want to save the thumbs (since they are very small) in the database and I use MySQL. (I don't want to save the thumbs as physical files on the drive.)
Does MySQL allow saving and retriev...