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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 )

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1) How do you create a new array containing 10 numbers?

range(0, 10);

range (1, 100, 10);

list(0, 10);

2) How do you create an array using an array for keys and another for values?

list($keys, $values);

array_intersect($keys, $values);

array_combine($keys, $values);

3) How do you append an array to another and not overwrite the keys?

$res = array_combine($arr1, $arr2);

$res = $arr1 + $arr2;

$res = array_merge($arr1, $arr2);

Pov 2 Pov 1

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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 )

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