PHP function that returns an Array with Unique Random Numbers or Letters. The function receives three arguments: the number of items in array ($nri), the lowest number or letter ($min), and the highest number or letter ($max).
/*
 Function to create an array of unique random numbers or letters
 Receives 3 arguments:
   $nri = number of items in array
   $min = the lowest number, or letter
   $max = the highest number, or letter
*/
function randomNrLtArray($nri, $min, $max) {
  // From: http://coursesweb.net/php-mysql/
  // creates an array with values from $min to $max
  $arr = range($min, $max);

  // randomizes the order of the elements in $arr, extracts and keeps the first $nri items
  shuffle($arr);
  $arr = array_slice($arr, 0, $nri);

  return $arr;      // returnns the array
}
- Example: gets an array with 5 random numbers from 1 to 50, and another array with 4 random letters from "A" to "M".
<?php
/*
 Function to create an array of unique random numbers or letters
 Receives 3 arguments:
   $nri = number of items in array
   $min = the lowest number, or letter
   $max = the highest number, or letter
*/
function randomNrLtArray($nri, $min, $max) {
  // From: http://coursesweb.net/php-mysql/
  // creates an array with values from $min to $max
  $arr = range($min, $max);

  // randomizes the order of the elements in $arr, extracts and keeps the first $nri items
  shuffle($arr);
  $arr = array_slice($arr, 0, $nri);

  return $arr;      // returnns the array
}

// array with 5 random numbers from 1 to 50
$nrs = randomNrLtArray(5, 1, 50);

// array with 4 random letters from "A" to "M"
$lts = randomNrLtArray(4, 'A', 'M');

// Test
var_export($nrs);
echo '<br/>';
var_export($lts);
?>
Results:
array (0 => 6, 1 => 23, 2 => 42, 3 => 47, 4 => 8)
array (0 => 'J', 1 => 'D', 2 => 'F', 3 => 'G')

Daily Test with Code Example

HTML
CSS
JavaScript
PHP-MySQL
Which tag is used to add lists into <ul> and <ol> elements?
<dt> <dd> <li>
<ul>
 <li>http://coursesweb.net/html/</li>
 <li>http://coursesweb.net/css/</li>
</ul>
Which value of the "display" property creates a block box for the content and ads a bullet marker?
block list-item inline-block
.some_class {
  display: list-item;
}
Which instruction converts a JavaScript object into a JSON string.
JSON.parse() JSON.stringify eval()
var obj = {
 "courses": ["php", "javascript", "ajax"]
};
var jsonstr = JSON.stringify(obj);
alert(jsonstr);    // {"courses":["php","javascript","ajax"]}
Indicate the PHP class used to work with HTML and XML content in PHP.
stdClass PDO DOMDocument
$strhtml = '<body><div id="dv1">CoursesWeb.net</div></body>';
$dochtml = new DOMDocument();
$dochtml->loadHTML($strhtml);
$elm = $dochtml->getElementById("dv1");
echo $elm->nodeValue;    // CoursesWeb.net
Create Array of Unique Random Numbers or Letters

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