Arrays (PHP)
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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