Itterate & Sort 2D Array
Hi Experts,
I'm new to PHP Arrays, but I have:
My questions are:
1-how can I sort these within $employees by name?
2-how can I itterate through $employees, I understand foreach ($employee as $e), but what is ($employees as $key => $value)?
Thank you
I'm new to PHP Arrays, but I have:
$employees = array();
$emp['name'] = 'john';
$emp['phone'] = '1234567890';
$emp['id'] = 123;
$employees[] = $emp;
$emp['name'] = 'bob';
$emp['phone'] = '9876543210';
$emp['id'] = 456;
$employees[] = $emp;My questions are:
1-how can I sort these within $employees by name?
2-how can I itterate through $employees, I understand foreach ($employee as $e), but what is ($employees as $key => $value)?
Thank you
Ray Paseur
You can use PHP usort() to sort multidimensional arrays. I'll see if I can come up with an example for this test data set.
Please see: http://iconoun.com/demo/temp_apd_toronto.php
<?php // demo/temp_apd_toronto.hp
error_reporting(E_ALL);
// MAKE TEH OUTPUT EASY TO READ
echo '<pre>';
// CREATE AN EMPTY ARRAY
$employees = array();
// CREATE A SMALL ASSOCIATIVE ARRAY
$emp['name'] = 'john';
$emp['phone'] = '1234567890';
$emp['id'] = 123;
// INJECT THIS ARRAY INTO THE LARGER ARRAY
$employees[] = $emp;
// CREATE A SMALL ASSOCIATIVE ARRAY
$emp['name'] = 'bob';
$emp['phone'] = '9876543210';
$emp['id'] = 456;
// INJECT THIS ARRAY INTO THE LARGER ARRAY
$employees[] = $emp;
// SHOW THE INITIAL STATE OF THE LARGE ARRAY OF SMALLER ASSOCIATIVE ARRAYS
print_r($employees);
// CREATE A FUNCTION THAT CAN SORT THE LARGER ARRAY
// USING AN ELEMENT OF THE SMALLER ASSOCIATIVE ARRAYS
function cmp_name($a, $b)
{
if ($a["name"] == $b["name"]) return 0;
return ($a["name"] < $b["name"]) ? -1 : 1;
}
// RUN THE FUNCTION (MIGHT ALSO USE A CLOSURE)
usort($employees, 'cmp_name');
// SHOW THE WORK PRODUCT
var_dump($employees);
// SHOW HOW TO USE THE ITERATOR
foreach ($employees as $key => $value)
{
echo PHP_EOL . "KEY: $key";
echo PHP_EOL . 'VALUE: ';
print_r($value);
echo PHP_EOL;
}ASKER
This helps, but what if in the foreach i just want to out my names?
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Thanks for the points - it's a great question. USort() is one of the PHP features that is often overlooked. Best of luck with your project, ~Ray