The concept of NULL in SQL, including MySQL, is a little hard to get at first, so the NULL keyword is tough to use as well.
This blog post helps to clarify it.
Category: Information Technology
Technology, primarily Information Technology
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Extract the extension from a filename
This is a simple technique to extract the filename extension from a filename. It could easily be adapted to extract the filename from a path or a query string from a URL by changing the first parameter of the explode() function.
$extension = end(explode('.', $filename)); |
Sometimes the text in a form field is put there primarily for the purpose of being copied to the clipboard.
In these cases a little JavaScript will smooth the process, selecting the full contents of the field on the first click.
Place the following script in the
section of your page:1 2 3 4 5 | <script type="text/JavaScript"> function highlight(field) { field.focus(); field.select(); }</script> |
Then place onClick='highlight(this);' as an attribute to any field you want treated this way:
1 | <input type="text" name="myfield" size="20" value="mytext" onClick='highlight(this);'> |
[sourcecode language="php"]
# show full path of current dir in linux command prompt
PS1="[\u@\h \w]\\$ "
[/sourcecode]
WordPress can have the disconcerting habit of inserting a space between the < and ?php when you want to show a code block in a syntax-highlighter plugin. To cure this, go into your WP Admin page, select the Settings menu, Select the writing submenu, then uncheck the WordPress should correct invalidly nested XHTML automatically option.