I have an array of objects; running print_r() returns the output below;
Array
(
[0] => stdClass Object
(
[sm_id] => 1
[c_id] => 1
)
[1] => stdClass Object
(
[sm_id] => 1
[c_id] => 2
)
)
How to loop through the result and access the student class objects?
Use
//$arr should be array as you mentioned as below
foreach($arr as $key=>$value){
echo $value->sm_id;
}
OR
//$arr should be array as you mentioned as below
foreach($arr as $value){
echo $value->sm_id;
}
Looping over arrays and objects is a pretty common task, and it's good that you're wanting to learn how to do it. Generally speaking you can do a foreach loop which cycles over each member, assigning it a new temporary name, and then lets you handle that particular member via that name:
foreach ($arr as $item) {
echo $item->sm_id;
}
In this example each of our values in the $arr will be accessed in order as $item. So we can print our values directly off of that. We could also include the index if we wanted:
foreach ($arr as $index => $item) {
echo "Item at index {$index} has sm_id value {$item->sm_id}";
}
Assuming your sm_id and c_id properties are public, you can access them by using a foreach on the array:
$array = array(/* objects in an array here */);
foreach ($array as $obj) {
echo $obj->sm_id . '<br />' . $obj->c_id . '<br />';
}
Recursive traverse object or array with array or objects elements:
function traverse(&$objOrArray)
{
foreach ($objOrArray as $key => &$value)
{
if (is_array($value) || is_object($value))
{
traverse($value);
}
else
{
// DO SOMETHING
}
}
}
Related
I have a output of print_r below and I want to access all the individual elements value with foreach loop but unfortunately I am unable to do that via foreach. Could anyone please help me with the associate array question.
I can access via this $arr['Level1'][Date] and it returns value as "2015-04-14 07:15".
But how to get all the element values via foreach loop?
Array
(
[Level1] => Array
(
[Date] => 2015-04-14 07:15
[img1] => pic1
[img2] => pic2
[InnerLevel] => Array
(
[0] => value1
[1] => value2
)
)
[Level2] => Array
(
[Date] => 2015-04-15 08:15
[img1] => pic1
[img2] => pic2
[InnerLevel] => Array
(
[0] => value3
[1] => value4
)
)
)
<?php
foreach ($myarray as $level => $itemArr) {
if(is_array($itemArr)) {
foreach ($itemArr as $levelArr) {
if(is_array($levelArr)) {
foreach ($levelArr as $key => $interlevelValue) {
echo $interlevelValue;
}
} else {
echo $levelArr;
}
}
} else {
echo $itemArr;
}
}
?>
foreach ($myarray as $item) {
echo $item['Date'] . "\n";
}
The fact that the array is associative or not doesn't change anything.
$item is successively a copy of $myarray['Level1'] then $myarray['Level2'] (etc. if more) in the foreach loop.
It depends on index depth.
To extract simple associative arrays like:
$mainarray['Name']='Value';
Use:
foreach ($mainarray as $aname=>$avalue)
{
echo $aname." in ".$mainarray." = ".$avalue." <br>";
}
To extract deeper associative arrays like:
$mainarray['Child']['Name']='Value';
Use:
foreach ($mainarray as $aname=>$asubarray)
{
echo "In ".$aname." from ".$mainarray."...<br>";
foreach ($asubarray as $asubname=>$asubvalue){
echo $asubname." = ".$avalue." <br>";
}
echo "<br>";
}
This:
<br>
represents new line. If you're running the code from a command line or you just want text only output, then use this for a new line:
\n
Actually there is another way of doing this in php.
"Iterating over Multidimensional arrays is easy with Spl Iterators :
$iterator = new RecursiveIteratorIterator(new RecursiveArrayIterator($array));
foreach($iterator as $key=>$value) {
echo $key.' -- '.$value.'<br />';
}
This will iterate through all possible iterable objects.
See
http://php.net/manual/en/spl.iterators.php
http://www.phpro.org/tutorials/Introduction-to-SPL.html
" - Quoted from - https://stackoverflow.com/a/2149106/1766122 answered by #Gordon
I have an array ($myArray) like this:
print_r(array_values ($myArray));
result: Array (
[0] =>
[1] => Array (
[id] => 1
[name] => ABC
)
[2] => Array (
[id] => 2
[name] => DEF
)
)
I'm trying to get each ID and NAME.. So Im trying this:
foreach ($myArray as $value) {
foreach($value as $result) {
echo $result;
}
}
I'm facing two problems:
I get a PHP WARNING that says: " Invalid argument supplied for foreach() on line 29
This line is: foreach($value as $result) {
I would like to get keys to ID and NAME to place them in correct places. This ways echo "1ABC" and "2DEF"
Any idea? Thanks for helping.
Basically, the error triggered, since the array in your example (index zero in particular) is not an array (most likely an empty string/null ) which is being used inside foreach.
Since one of the elements is not an array, you could just check that if its an array or not using is_array():
foreach($myArray as $values) {
if(is_array($values)) {
echo $values['id'] . ' ' . $values['name'] . '<br/>';
}
}
Alternatively, you could also use array_filter() in this case which in turn removes that empty index zero, so that you could just use that loop that you have. You wouldn't have to check for that empty element.
$myArray = array_filter($myArray);
foreach ($myArray as $value) {
foreach($value as $result) {
echo $result;
}
}
try this,
foreach (array_slice($myArray ,1) as $value) {
foreach($value as $result) {
echo $result;
}
}
the 1st position is empty so omit first position
Not sure why I can't this to work. My json is:
[values] => Array
(
[0] => Array
(
[field] => id1
[value] => 985
)
[1] => Array
(
[field] => id2
[value] => 6395
)
[2] => Array
(
[field] => memo
[value] => abcde
)
I simply want the values of id2
I tried:
foreach ($json['values'] as $values) {
foreach ($json as $key=>$data) {
if ($data['field'] == 'id2') {
$result = $data['value'];
print '<br>value: '.$result;
}
}
}
Thanks. I know this should be relatively simple and I'm sure I've done this correctly before.
there's no need for inner loop, after the first one $values already contain the exact array that you are looking for
foreach ($json['values'] as $values) // $values contain
{
if ($values['field'] == 'id2')
{
$result = $values['value'];
print '<br>value: '.$result;
}
}
foreach ($json['values'] as $values) { //you're looping your first array, puttin each row in a variable $values
foreach ($values as $key=>$data) { //you're looping inside values taking the array index $key and the value inside that index $data
if ($key == 'id2') { //test if $key (index) is = to id2
print '<br>value: '.$value; // print the value inside that index
}
}
}
this is just an explanation, to what is going wrong with your code, but as #Pawel_W there is no need for the second foreach loop you can directly test
if($values['field']=='id2'){ print $values['value'];}
I think you just need to use array_search.
And here is recursive array_search ;
Assuming there might be multiple fields with the same name and you want them all as array, here's an alternative take:
array_filter(array_map(function($item) { return $item['field'] == 'id2' ? $item['value'] : null; }, $json['values']));
If your field names are always unique and you just want a single scalar:
array_reduce($json['values'], function($current, $item) { return $item['field'] == 'id2' ? $item['value'] : $current; });
(note that this one is not ideal since it will walk all the array even if match is found in first element)
And here's a gist with both in this and function form + output.
I've a nested array whose print_r looks like this-
Array
(
[keyId] => Array
(
[hostname] => 192.168.1.127
[results] => Array
(
[1] => false
[2] => false
[3] => false
)
[sessionIDs] => Array
(
[0] => ed9f79e4-2640-4089-ba0e-79bec15cb25b
)
)
I would like to process(print key and value) of the "results" array. How do I do this?
I am trying to use array_keys function to first get all the keys and if key name is "results", process the array. But problem is array_keys is not reaching into the "results"
php's foreach loop is what you need.
foreach($arr['keyId']['results'] as $key => $value) {
//$key contains key and $value contains values.
}
The array you want is $array['keyID']['results']. From there you access the values with $array['keyID']['results'][1], $array['keyID']['results'][2], $array['keyID']['results'][3]
To loop through it just do this:
foreach($array['keyId']['results'] as $key => $value) {
echo $key . ' ' . $value;
}
or
for ($i = 1; $i <= 3; i++)
{
echo $i . ' ' . $array['keyID']['results'][i];
}
foreach($array['keyId']['results'] as $k => $v) {
// use $k and $v
}
One way to navigate through the array is this.
//Assuming, your main array is $array
foreach($array as $value) { //iterate over each item
if(isset($value['results']) && count($value['results'])) {
// ^ check if results is present
//Now that we know results exists, lets use foreach loop again to get the values
foreach($value['result'] as $k => $v) {
//The boolean values are now accessible with $v
}
}
}
I have the following main array called $m
Array
(
[0] => Array
(
[home] => Home
)
[1] => Array
(
[contact_us] => Contact Us
)
[2] => Array
(
[about_us] => About Us
)
[3] => Array
(
[feedback_form] => Feedback Form
)
[4] => Array
(
[enquiry_form] => Products
)
[5] => Array
(
[gallery] => Gallery
)
)
I have the values eg home, contact_us in a array stored $options , I need to get the values from the main array called $m using the $options array
eg. If the $options array has value home, i need to get the value Home from the main array ($m)
my code looks as follows
$c = 0;
foreach($options as $o){
echo $m[$c][$o];
++$c;
}
I somehow just can't receive the values from the main array?
I'd first transform $m to a simpler array with only one level:
$new_m = array();
foreach ($m as $item) {
foreach ($item as $key => $value) {
$new_m[$key] = $value;
}
}
Then you can use:
foreach ($options as $o) {
echo $new_m[$o];
}
Try this:
foreach($options as $o){
foreach($m as $check){
if(isset($check[$o])) echo $check[$o];
}
}
Although It would be better TO have the array filled with the only the pages and not a multidimensional array
Assuming keys in the sub arrays are unique you can
merge all sub arrays into a single array using call_user_func_array on array_merge
swap keys and values of your option array
Use array_intersect_key to retrieve an array with all the values.
Example like so:
$options = array('about_us', 'enquiry_form');
$values = array_intersect_key(
call_user_func_array('array_merge', $m), // Merge all subarrays
array_flip($options) // Make values in options keys
);
print_r($values);
which results in:
Array
(
[about_us] => About Us
[enquiry_form] => Products
)
How's this?
foreach( $options as $option )
{
foreach( $m as $m_key => $m_value )
{
if( $option == $m_key )
{
echo 'Name for ' . $options . ' is ' . $m_value;
break;
}
}
}
Try using a recursive array_walk function, for example
$a = array(
array('ooo'=>'yeah'),
array('bbb'=>'man')
);
function get_array_values($item, $key){
if(!is_numeric($key)){
echo "$item\n";
}
}
array_walk_recursive($a,'get_array_values');
Are you sure that the options array is in the same order of $m? Maybe you your
echo $m[$c][$o];
is resolving into a $m[0]['gallery'] which is obviously empty.
you can try different solutions, to me, a nice one (maybe not so efficient) should be like this:
for($c=0, $limit=count($c); $c < $limit; $c++)
if (array_search(key($m[$c]), $options))
echo current($m[$c]);
If you would like to use your approach have to flatten your array with something like this:
foreach ($m as $o)
$flattenedArray[key($o)]=current($o);
foreach ($options as $o)
echo $flattenedArray($o);
Doing this, though, eliminates duplicate voices of your original array if there are such duplicates.
$trails1 = array();
foreach ($trails as $item) {
foreach ($item as $key => $value) {
$trails1[].= $value;
}
}
echo '<pre>';print_r($trails1);
exit;