The function presented in this page (sortMultiArray() ) can be used to sort /order an entire multi-dimensional array by one element of it, case-insensitive. Returns the sorted multi-dimensional array.
    - Code of the function:
/*
 Sorts an entire multi-dimensional array by one element of it
 - $arr = the multi-dimensional array
 - $k = a string with the name of the index-key by which the entire array will be sorted
 - $sort = one of these sorting type flags:

    SORT_ASC - sort items ascendingly.
    SORT_DESC - sort items descendingly.
    SORT_REGULAR - compare items normally (don't change types)
    SORT_NUMERIC - compare items numerically
    SORT_STRING - compare items as strings
    SORT_LOCALE_STRING - compare items as strings, based on the current locale. It uses the locale, which can be changed using setlocale()
    SORT_NATURAL - compare items as strings using "natural ordering" like natsort()
*/
function sortMultiArray($arr, $k, $sort) {
  $tmp = Array();
  foreach($arr as &$ma)  $tmp[] = &$ma[$k];
  $tmp = array_map('strtolower', $tmp);      // to sort case-insensitive
  array_multisort($tmp, $sort, $arr);
  return $arr;
}
- Example usage. Sorts the following array, by "nr", descendingly; and by "fruit".
$arr = array(
 'alex'=>array('nr'=>3, 'fruit'=>'orange'),
 'mars'=>array('nr'=>8, 'fruit'=>'Banana'),
 'victor'=>array('nr'=>4, 'fruit'=>'apple'),
);
Code:
<?php
// https://coursesweb.net/php-mysql/
/*
 Sorts an entire multi-dimensional array by one element of it
 - $arr = the multi-dimensional array
 - $k = a string with the name of the index-key by which the entire array will be sorted
 - $sort = one of these sorting type flags:

    SORT_ASC - sort items ascendingly.
    SORT_DESC - sort items descendingly.
    SORT_REGULAR - compare items normally (don't change types)
    SORT_NUMERIC - compare items numerically
    SORT_STRING - compare items as strings
    SORT_LOCALE_STRING - compare items as strings, based on the current locale. It uses the locale, which can be changed using setlocale()
    SORT_NATURAL - compare items as strings using "natural ordering" like natsort()
*/
function sortMultiArray($arr, $k, $sort) {
  $tmp = Array();
  foreach($arr as &$ma)  $tmp[] = &$ma[$k];
  $tmp = array_map('strtolower', $tmp);      // to sort case-insensitive
  array_multisort($tmp, $sort, $arr);
  return $arr;
}

// two-dimensional array
$arr = array(
 'alex'=>array('nr'=>3, 'fruit'=>'orange'),
 'mars'=>array('nr'=>8, 'fruit'=>'Banana'),
 'victor'=>array('nr'=>4, 'fruit'=>'apple'),
);

// sorts the array by 'nr', descendingly
$arr1 = sortMultiArray($arr, 'nr', SORT_DESC);

// sorts the array by 'fruit'
$arr2 = sortMultiArray($arr, 'fruit', SORT_STRING);

// Test
echo '<pre>By "nr":<br/>';
var_export($arr1);

echo '<br/><br/>By "fruit":<br/>';
var_export($arr2);
echo '</pre>';
Results:
By "nr":
array (
  'mars' => array ( 'nr' => 8, 'fruit' => 'Banana' ),
  'victor' => array ( 'nr' => 4, 'fruit' => 'apple' ),
  'alex' => array ( 'nr' => 3, 'fruit' => 'orange' )
)

By "fruit":
array (
  'victor' => array ( 'nr' => 4, 'fruit' => 'apple' ),
  'mars' => array ( 'nr' => 8, 'fruit' => 'Banana' ),
  'alex' => array ( 'nr' => 3, 'fruit' => 'orange' )
)

The sortMultiArray() function performs a case-insensitive sorting. To perform a case-sensitive sorting (strings starting with a capital letter to come before strings starting with a lowercase letter) remove (or comment) this line of code from the function.
    $tmp = array_map('strtolower', $tmp);     // to sort case-insensitive

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
Sort an entire multi-dimensional Array

Last accessed pages

  1. setTimeout and this with bind() method in JavaScript class (622)
  2. Volume and Surface Area Calculator for 3D objects (7547)
  3. Convert XML to JSON in PHP (8415)
  4. Ajax click Tracking - Monitor clicks on html elements (608)
  5. Contact page - CoursesWeb (2471)

Popular pages this month

  1. Contact page - CoursesWeb (1957)
  2. Tabs effect with CSS (1944)
  3. Insert, Select and Update NULL value in MySQL (1038)
  4. Read Excel file data in PHP - PhpExcelReader (833)
  5. PHP getElementById and getElementsByTagName (513)