Radians and degrees are 2 different quantitative approaches to denote an angle, in PHP, you can convert a radian value to a degree by the function rad2reg() and a degree value to radian by the function deg2rad(): $degrees = rad2deg(‘3.1416’); // $degrees = 180 $radians = deg2rad(180); // $radians = 3.14159265359

By nature, a strict computer sorting algorithm would place ’10’ before ‘2’. As a result of comparison on a byte by byte basis, the first byte of the 2 strings are determined in the order that 1 comes before 2, thus placing ’10’ before ‘2’. However, in a natural sorting algorithm, ‘2’ comes before ’10’. …

PHP: Sort and Order Array Items / Elements / Numbers Naturally so 2 Comes before 10 Read More »

While you can always make your own function to take on an array of numeric values and find out the highest or lowest value from all of the numbers, PHP has got the inherent functions min() and max() for this kind of job: print min(24.4, -11, 0.3); // output: -11 print min(array(24.4, -11, 0.3)); // …

PHP: Find and Return the Minimum (Lowest) Value or Maximum (Highest) Value of Several Numbers Read More »

All 3 PHP functions: exec(), system() and passthru() executes an external command, but the differences are: exec(): returns the last line of output from the command and flushes nothing. shell_exec(): returns the entire output from the command and flushes nothing. system(): returns the last line of output from the command and tries to flush the …

PHP: Differences between exec(), shell_exec(), system() and passthru() Read More »

The simples PHP function that does the job I can think of is checkdate(): if (checkdate(2, 28, 1999)) { // Feb. 28th, 1999 echo ‘valid’; } else { echo ‘invalid’; }

To switch the position of keys and corresponding values in each element of an array, use the PHP function array_flip(): $a = array(‘1’ => ‘a’, ‘2’ => ‘b’, ‘3’ => ‘c’); $b = array_flip($a); print_r($b); And the output would be: Array ( [a] => 1 [b] => 2 [c] => 3 )

To create an array of a series of consecutive numbers or alphabetical letters or even any ASCII characters, you can use PHP function range(): $a = range(0, 100, 2); // $a is an array of even integers from 0 to 100. $b = range(‘a’, ‘z’); // $b now contains all lowercase alphabetic letters from a …

PHP: Create an Array of A Range of Characters (Numbers or Letters) or Multiple Identical Values Read More »

For example, you have an array of non-unique values that are student names, you know there are just 5 of them but a total of 15 elements exist in that array with some student names repeated in more than one elements. To count the occurrences of all the unique values, in this case, 5 student …

PHP: Count the Number of Occurrences of Each Unique Value in an Array Read More »

A big array is awkward. To divide the big array and split it into smaller sub-arrays or children arrays by size, you can use the PHP function array_chunk(): $sections = array_chunk(array(‘k’, ‘l’, ‘m’, ‘n’, ‘o’), 2); To slice $sections into smaller arrays by the size of 2, and $sections will look like this: Array ( …

PHP: Divide and Split an Array into Chunks (Sections) or Several Sub-arrays Read More »

While you can easily fabricate your own functions to do this element by element, you can simply resort to the php function array_change_key_case() to do it for you: $new_array = array_change_key_case($old_array, CASE_UPPER); Changes all the keys in $old_array to upper case and $new_array = array_change_key_case($old_array, CASE_LOWER); Changes all the keys in $old_array to lower case.

Array is probably the simplest compound data type every language supports. It’s basically a set of ordered values (text strings, numbers or booleans and even a child array). You can create an array in PHP by: $companies = array(‘Microsoft’, ‘Google’, ‘IBM’, ‘Apple’); Now array $companies contains 4 text string values. You can append one more …

PHP: Create an Array Read More »