How can I loop through this array - PHP - php

Question

This is the var_dump($options)
array (size=4)
0 => string '2' (length=1)
'parent_2_children' =>
array (size=3)
0 => string '22' (length=2)
1 => string '24' (length=2)
2 => string '23' (length=2)
1 => string '3' (length=1)
'parent_3_children' =>
array (size=3)
0 => string '26' (length=2)
1 => string '25' (length=2)
2 => string '27' (length=2)
What I have tried up to now is
if(!is_null($options))
{
foreach($options as $option)
{
if(!array_key_exists('parent_'.$option.'_children',$options))
{
//if position null output an error
}
}
}
Print_r() as requested
Array
(
[0] => 2
[parent_2_children] => Array
(
[0] => 22
[1] => 24
[2] => 23
)
[1] => 3
[parent_3_children] => Array
(
[0] => 26
[1] => 25
[2] => 27
)
)

Answer 1

use print_r($options) in staid of var_dump it's easier to read..
check if you got a numeric key, then check if the new key exists. Throw an error.
if(!is_null($options)) {
foreach($options as $key => $option) {
if(is_int($key) && !array_key_exists('parent_'.$option.'_children',$options)) {
echo 'parent_'.$option.'_children does not exist';
}
}
}
Here is a working example

Answer 2

Your code is correct. An additional check on the nature of the key will reduce the execution, since you have to do the processing only for numeric keys.
if(!is_null($options))
{
foreach($options as $key => $option)
{
if (is_numeric($key)) {
if(!array_key_exists('parent_'.$option.'_children',$options))
{
print 'parent_'.$option.'_children does not exist';
}
}
}
}
To test the code, try the following array :
$options = array(0 => 2, 'parent_2_children' => array ( 0 => 22, 1 => 24, 2 => 23 ), 1 => 3, 'parent_3_children' => array ( 0 => 26, 1 => 25, 2 => 27 ), 2=>4 );
whose print_r output will be :
Array
(
[0] => 2
[parent_2_children] => Array
(
[0] => 22
[1] => 24
[2] => 23
)
[1] => 3
[parent_3_children] => Array
(
[0] => 26
[1] => 25
[2] => 27
)
[2] => 4
)
and, it will output :
parent_4_children does not exist

Answer 3

Try this?
if(!is_null($options)){
foreach($options as $option){
if(!array_key_exists('parent_'.$option.'_children',$options)){
throw new Exception("Something went wrong!");
}
}
}