PHP - Usefull array functions
After looking at string functions, let's look at arrays.
You will find yourself using array very often. In this example we will see just a few of many useful array functions. I will explain these functions in code comments.
<?php
// create an array
$my_array = array(1, 2, 3, 4, 5, 7, 56, 745, 76, 4567, 345, 63456, 345, 6457, 45);
echo "\nInitial array\n";
// display array
var_dump($my_array);
// count elements in array
$count = count($my_array);
echo "\n\$my_array have " . $count . "elements\n";
// sort array
sort($my_array);
echo "\nSorted array\n";
// display array another way
print_r($my_array);
// reverse array
$my_array = array_reverse($my_array);
echo "\nReversed array\n";
print_r($my_array);
// random order of elements in array
shuffle($my_array);
echo "\nRandom order\n";
print_r($my_array);
// create another array
$my_another_array = array(3, 4, 455, 677, 5676, 34745, 746, 4515, 456, 45, 300);
// display array
echo "\nAnother array\n";
print_r($my_another_array);
// sort array in reverse order (similar to sort it and then reverse it)
rsort($my_another_array);
echo "\nReverse sorted array\n";
print_r($my_another_array);
// difference between two arrays (returns elements in $my_array not contained in $my_another_array)
$difference_array = array_diff($my_array, $my_another_array);
// display array
echo "\nDiference (elements in \$my_array not contained in \$my_another_array)\n";
print_r($difference_array);
// intersection - elements contained in both arrays
$intersection_array = array_intersect($my_array, $my_another_array);
echo "\nIntersection (elements contained in both arrays)\n";
print_r($intersection_array);
// merge array - all elements from both arrays
$merged_array = array_merge($my_array, $my_another_array);
echo "\nMerged array\n";
print_r($merged_array);
// remove duplicates from array
$merged_array = array_unique($merged_array);
echo "\nMerged array without duplicates\n";
print_r($merged_array);
// Check for value and get its index
$element_index = array_search(76, $my_array);
echo "value 76 in array \$my_array is element with index " . $element_index . "\n";
// Just check if value exists in array
if (in_array(76, $my_array))
echo "value 76 is in the array\n";
if ( ! in_array(1000, $my_array))
echo "but value 1000 is not\n";
echo "\n\nand many many more…"
?>
// create an array
$my_array = array(1, 2, 3, 4, 5, 7, 56, 745, 76, 4567, 345, 63456, 345, 6457, 45);
echo "\nInitial array\n";
// display array
var_dump($my_array);
// count elements in array
$count = count($my_array);
echo "\n\$my_array have " . $count . "elements\n";
// sort array
sort($my_array);
echo "\nSorted array\n";
// display array another way
print_r($my_array);
// reverse array
$my_array = array_reverse($my_array);
echo "\nReversed array\n";
print_r($my_array);
// random order of elements in array
shuffle($my_array);
echo "\nRandom order\n";
print_r($my_array);
// create another array
$my_another_array = array(3, 4, 455, 677, 5676, 34745, 746, 4515, 456, 45, 300);
// display array
echo "\nAnother array\n";
print_r($my_another_array);
// sort array in reverse order (similar to sort it and then reverse it)
rsort($my_another_array);
echo "\nReverse sorted array\n";
print_r($my_another_array);
// difference between two arrays (returns elements in $my_array not contained in $my_another_array)
$difference_array = array_diff($my_array, $my_another_array);
// display array
echo "\nDiference (elements in \$my_array not contained in \$my_another_array)\n";
print_r($difference_array);
// intersection - elements contained in both arrays
$intersection_array = array_intersect($my_array, $my_another_array);
echo "\nIntersection (elements contained in both arrays)\n";
print_r($intersection_array);
// merge array - all elements from both arrays
$merged_array = array_merge($my_array, $my_another_array);
echo "\nMerged array\n";
print_r($merged_array);
// remove duplicates from array
$merged_array = array_unique($merged_array);
echo "\nMerged array without duplicates\n";
print_r($merged_array);
// Check for value and get its index
$element_index = array_search(76, $my_array);
echo "value 76 in array \$my_array is element with index " . $element_index . "\n";
// Just check if value exists in array
if (in_array(76, $my_array))
echo "value 76 is in the array\n";
if ( ! in_array(1000, $my_array))
echo "but value 1000 is not\n";
echo "\n\nand many many more…"
?>
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