January 2016

Mysql query – Find term_taxonomy_id for a tag name Use the following query to find term_taxonomy_id for a tag name after replacing “PHP” with the read more

Find term_taxonomy_id for a category name Use the following query to find term_taxonomy_id for a category name after replacing “Tutorials” with the category you want read more

Remove php extension from a specific url To remove php extension from a url (e.g. /foo/bar.php) the following Apache rewrite rule can be used: RewriteRule read more

Cloning table with indexes/triggers and data First create new table with same structure. We’ll use wordpress table wp_posts for the purpose of this tutorial. mysql> read more

This form can be used to encode a string using php json_encode function. Note that outcome will be enclosed in quotes (“”).

get wpdb class method names using get_class_methods Here is the outcome from above code:

PHP – get class name of an object get_class with object as arguments returns its class name. PHP – get filename from class name Here read more

Few notes on Javascript array forEach Array arr is passed to function as local variable a Array arr is also available in function here as read more

Code snippet to check if a given javascript variable is defined. This also covers a variable having null value and non existing entry in an read more

Javascript syntax check – check if syntax of given javascript code is valid and see errors online. Sample javascript code Valid javascript code example var read more

Use rsync dryrun (-n) with -i (or –itemize-changes) to list changed files. $ rsync -n -i -a ./dir1 ./destdir/ cd+++++++ dir1/ >f+++++++ dir1/file1.php >f+++++++ dir1/file2.php read more

for in loop over javascript associative array for in loop over javascript DOM object

Get dictionary key with default if not found using method get() This is better approach in most cases. Get dictionary key using square brackets ([]) read more

Total queries on mysql prompt: mysql> SHOW STATUS like “Queries”; +—————+——–+ | Variable_name | Value | +—————+——–+ | Queries | 278583 | +—————+——–+ 1 row read more

Get post_type page with missing meta_key Get post_type post with missing meta_key

Php regex can use caret (^) for matching from beginning of string and dollar ($) for end of line. Here are some examples using preg_replace. read more

Regex to remove non printable characters from a string Space is first printable char and tilde (~) is last printable ascii char. We replace any read more

ASCII printable characters – octal, hexadecimal, decimal values of printable ascii characters. printable ascii characters

Take last 3 characters when string is big enough Take last 3 characters when string is smaller than 3 chars

PHP array – foreach loop on values PHP array – foreach loop on index,values PHP array – foreach loop for modification PHP associative array – read more

Curl with rate limit (both download and upload bandwidth) to 1 KBps (1 kilobytes per second) $ curl –limit-rate 1K https://infoheap.com/ > out.html // or read more

Javascript querySelector() and querySelectorAll() can be used to get DOM element based on given CSS selector. These works on document and element objects both. querySelector() read more

Bash functions can have local variables. This can protect the accidental modification of global variables when function is called inline within same shell. Here are read more

Python lint check – check if syntax of given python code is valid and see errors online. Sample python code Valid python code using print read more

Php lint check – check if syntax of given php code is valid and see errors online. Sample valid php code Simple php code using read more

Look ahead and look behind can be very useful to match a pattern which is followed, not followed, preceded or preceded by a certain pattern. read more

svn log can be used to show the log messages for a set of revision(s) and/or path(s). Here are some ways to do svn log read more

Here are some examples you can print strings or variables in python on stdout. Print a string with newline in the end By default python read more

Frequently used python for loop examples. For loop to iterate over a list Iterate on each element of a list Iterate on each index, element read more

Php preg_match (preg_replace) can have greedy (default) or lazy regular expressions. Lazy match is done as soon as a valid match is found. Greedy match read more

Bash built in double square brackets can be used for regex match in if condition. This can be pretty powerful and can be used in read more