Array / Create
range() - Creates an array containing a range of elements
<?php
$images = range(1,100); // 1,2,3 ...
$images = range(0,100,10); // 10,20,30 ...
array_chunk() - split array into chunks
<?php
$images = range(0,100);
$chunks = array_chunk($images, 2);
// 2 - size of each chunk
// 1 - default
foreach($chunks as $chunk) { // 50 chunks
echo "<hr>";
foreach($chunk as $v) {
echo $v;
}
}
array_combine() - key from arr1, values from arr2
<?php
$keys = array('green', 'yellow');
$values = array('avocado', 'banana');
$arr = array_combine($keys, $values);
print_r($arr);
// Array ( [green] => avocado [yellow] => banana )
array_merge() - Merge one or more arrays
<?php
// Example 1
$one = 'foo';
$two = array('a', 'b');
$result = array_merge($one, $two);
// Warning: Argument #1 is not an array
$result = array_merge((array)$one, $two);
print_r($result);
// Array ( [0] => foo [1] => a [2] => b )
// Example 2 (same keys not numeric)
// If the input arrays have the same string keys,
// then the later value for that key will overwrite the previous one
$arr1 = array('color'=> 'red', 1);
$arr2 = array('a', 'color'=>'green');
$arr3 = array_merge($arr1, $arr2);
print_r($arr3);
// Array ( [color] => green [0] => 1 [1] => a )
// Example 3 (same keys numeric)
// If, however, the arrays contain numeric keys,
// the later value will not overwrite the original value
$arr1 = array(1,2);
arr2 = array(3,4);
$arr3 = array_merge($arr1, $arr2);
print_r($arr3);
// Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 )
// Example 4
// If don't want to ovewrite the elements from the first array
// use the + array union operator
$arr1 = array('color'=> 'red', 1);
$arr2 = array('color'=>'green', 2, 3);
$arr3 = $arr1 + $arr2;
print_r($arr3);
// Array ( [color] => red [0] => 1 [1] => 3 )
array_diff() - difference of arrays
<?php
// All the values of $a that do not appear in $b
// are retained
$a = array (1, 2, 3);
$b = array (1, 3, 4);
print_r(array_diff ($a, $b));
// Array ( [1] => 2 )
array_intersect() - intersect arrays
<?php
// Like with array_diff() array_intersect only keeps
// in consideration the value of each element
$a = array (1, 2, 3);
$b = array (1, 3, 4);
print_r(array_intersect ($a, $b));
// Array ( [0] => 1 [2] => 3 )
References
