Arrays (PHP)

Basis

Code:

<?php

$a = array
(
   # 'a', 'b' & 'c' are the indexes. 'apple', etc. are the values
   ##############################################################
   #
   'a' => 'apple', 
   'b' => 'banana', 
   'c' => array 

      # This sub-array has no indexes. Only values
      ############################################
      (
	'x', 
	'y', 
	'z'
      )
);

print_r ($a);
print var_dump($a);
print_r($a['a']);   # You can refer to the index. It's a string, hence the apostrophes

print_r($a['c']);   # Display subarray
print_r($a['c'][0]);   Display item 0 of the subarray. You can only refer by number because no other index has been defined

Output (slightly formatted):

# print_r($a):
##################
#
Array
(
    [a] => apple
    [b] => banana
    [c] => Array
        (
            [0] => x
            [1] => y
            [2] => z
        )

)

# var_dump
##################
#
array(3) {
  ["a"]=>
  string(5) "apple"
  ["b"]=>
  string(6) "banana"
  ["c"]=>
  array(3) {
    [0]=>
    string(1) "x"
    [1]=>
    string(1) "y"
    [2]=>
    string(1) "z"
  }
}

# print_r($a['a'])
##################
#

apple

# print_r($a['c']); - Subarray
##############################
#
Array
(
    [0] => x
    [1] => y
    [2] => z
)

# print_r($a['c'][0]); - Item 0 from the subarray
#################################################
#
x

Arrays vs. objects

Belangrijk om bewust te zijn van het verschil tussen arrays en objecten. Dit is een voorbeeld van een object:

WP_Term Object
(
    [term_id] => 26
    [name] => Merk
    [slug] => merk
    [term_group] => 0
    [term_taxonomy_id] => 26
    [taxonomy] => product_cat
    [description] => 
    [parent] => 0
    [count] => 0
    [filter] => raw
)

En dit is een array:

Array
(
    [a] => apple
    [b] => banana
    [c] => Array
        (
            [0] => x
            [1] => y
            [2] => z
        )
)

Rij toevoegen - array_push

$a=array
(
	0 => array
	(
	   'sku' 	=>	'0100',
	   'post_id'	=>	112,
	   'lang'	=>	'nl',
	),
	1 => array
	(
	   'sku' 	=>	'0100',
	   'post_id'	=>	113,
	   'lang'	=>	'en'
	),
	2 => array
	(
	   'sku' 	=>	'0100',
	   'post_id'	=>	116,
	   'lang'	=>	'de'
	)	
);

$b=array
(
	'sku' 	=>	'0100',
	'post_id'	=>	116,
	'lang'	=>	'hu'
);

print_r($a);
print_r($b);

array_push($a, $b);

print_r($a);

Merk op dat $b een dimensie minder telt dan $a.

Rij toevoegen - Simpler

In het voorbeeld hierboven was de eerste dimensie een index (of zoiets). Het kan simpeler in simpelere gevallen:

###################################################################
# Add a simple row to an array
###################################################################
#
# Define array
##############
#
$a=array
(
	'nl'	=>	123
);

# Add a row
############
#
$a=$a + array
(
	'de'	=>	234
);

print_r($a);

Rij updaten

Tata: https://stackoverflow.com/questions/15024616/php-foreach-change-original-array-values

Bronnen

• https://www.php.net/manual/en/function.print-r.php
• https://stackoverflow.com/questions/34666506/how-to-print-part-of-an-array-php