$arr['thisiskey'] = 1；
Like above,how to get "thisiskey" programmatically?
Use array_keys:
$keys = array_keys($array);
var_dump($keys[0]);
The simplest solution:
key($arr);
key returns current key of the array
Iteratively:
foreach ($array as $key => $value){
print $key . ' = ' . $value .'\n';
}
foreach ($arr as $key => $value) {
echo $key . PHP_EOL;
}
list($key, ) = each($arr);
print $key;
Related
its easy for sure..
i have code like this:
$indeks = 0;
foreach ($list as $k => $v)
{
$data['fname'] = $customer->firstname;
$data['lname'] = $customer->lastname;
$data['code'] = $code['code'];
$tablica[$indeks] = $data;
$indeks++;
and i want to read only 'code' value for each array.
i try:
foreach($tablica as $k => $v){
foreach ($v as $key => $value ) {
echo $value
}
}
but i get all arrays values.
when i try
foreach($tablica as $k => $v){
foreach ($v['code'] as $key => $value ) {
echo $value
}
}
i have nothing...
thx for help
You can use array_column function to get all values of column, for example:
foreach (array_column($tablica, 'code') as $value) {
echo $value;
}
I think a For loop should help
for($i=0;$i<count($tablica);$i++){
echo $tablica[$i]['code'];
}
or get all Codes into an Array
$code = array();
for($i=0;$i<count($tablica);$i++){
$code[$i] = $tablica[$i]['code'];
}
You don't need nested loops.
foreach ($tablica as $value) {
echo $value['code'];
}
DEMO
I have an array like this $arr = Array ("A","E","I","O","U");
My question is using implode function how can I make the output like this
1.A
2.E
3.I
4.O
5.U
You need to iterate over each values like this:
$arr = array("A","E","I","O","U");
foreach ($arr as $key => $value) {
echo $key + 1 . ".{$value} <br>";
}
This will give you the desired Output as:
1.A
2.E
3.I
4.O
5.U
Hope this helps!
$i = 1;
foreach ($arr as $v) {
echo $i . '.' . $v . '<br>';
$i++;
}
no need to use implode function. Just use foreach loop to iterate whole array.
use array_walk to traverse the array like this:
array_walk($array, function($v, $k)
{
echo $k + 1 . '.' . $v . "<br>";
});
Below is a simple array that I created:
$colors = array(
"parent1" =>array(
"item1"=>"red",
"item2"=>"green",
"item3"=>"blue",
"item4"=>"yellow"
),
"parent2" =>array(
"item1"=>"red",
"item2"=>"green",
"item3"=>"blue",
"item4"=>"yellow"
)
);
What I need to get is the key of my level 1 arrays which are string "parent1" and "parent2".
Currently I'm using foreach with while loop to get the key
foreach ($colors as $valuep) {
while (list($key, $value) = each($colors)) {
echo "$key<br />";
}
}
but I'm only able to get the "parent2" string from using the above method and not "parent1".
You're so close.
foreah($colors as $key => $val)
{
echo $key . "<br/>";
}
Use the key like so:
foreach ($colors as $key => $value) {
echo $key.'<br>';
}
To print out the keys:
foreach ($colors as $key => $value) {
echo $key . '<br />';
}
You can also get all of the keys from an array by using the array_keys() method, for example:
$keys = array_keys($colors);
foreach ($keys as $key) {
echo $key . '<br />';
}
I have this array:
$json = json_decode('
{"entries":[
{"id": "29","name":"John", "age":"36"},
{"id": "30","name":"Jack", "age":"23"}
]}
');
and I am looking for a PHP "for each" loop that would retrieve the key names under entries, i.e.:
id
name
age
How can I do this?
Try it
foreach($json->entries as $row) {
foreach($row as $key => $val) {
echo $key . ': ' . $val;
echo '<br>';
}
}
In the $key you shall get the key names and in the val you shal get the values
You could do something like this:
foreach($json->entries as $record){
echo $record->id;
echo $record->name;
echo $record->age;
}
If you pass true as the value for the second parameter in the json_decode function, you'll be able to use the decoded value as an array.
I was not satisfied with other answers so I add my own. I believe the most general approach is:
$array = get_object_vars($json->entries[0]);
foreach($array as $key => $value) {
echo $key . "<br>";
}
where I used entries[0] because you assume that all the elements of the entries array have the same keys.
Have a look at the official documentation for key: http://php.net/manual/en/function.key.php
You could try getting the properties of the object using get_object_vars:
$keys = array();
foreach($json->entries as $entry)
$keys += array_keys(get_object_vars($entry));
print_r($keys);
foreach($json->entries[0] AS $key => $name) {
echo $key;
}
$column_name =[];
foreach($data as $i){
foreach($i as $key => $i){
array_push($column_name, $key);
}
break;
}
Alternative answer using arrays rather than objects - passing true to json_decode will return an array.
$json = '{"entries":[{"id": "29","name":"John", "age":"36"},{"id": "30","name":"Jack", "age":"23"}]}';
$data = json_decode($json, true);
$entries = $data['entries'];
foreach ($entries as $entry) {
$id = $entry['id'];
$name = $entry['name'];
$age = $entry['age'];
printf('%s (ID %d) is %d years old'.PHP_EOL, $name, $id, $age);
}
Tested at https://www.tehplayground.com/17zKeQcNUbFwuRjC
Is there a way to traverse an array such as $_POST to see the field names and not just the values. To see the values I do something like this.
foreach ($_POST as $value){
echo $value;
}
This will show me the values - but I would like to also display the names in that array. If my $_POST value was something like $_POST['something'] and it stored 55; I want to output "something".
I have a few select fields that I need this for.
You mean like this?
foreach ( $_POST as $key => $value )
{
echo "$key : $value <br>";
}
you can also use array_keys if you just want an array of the keys to iterate over.
You can also use array_walk if you want to use a callback to iterate:
function test_walk( &$value, $key )
{
...do stuff...
}
array_walk( $arr, 'test_walk' );
foreach ($_POST as $key => $value) {
echo $key; // Field name
}
Or use array_keys to fetch all the keys from an array.
foreach ($_POST as $key => $value){
echo $key.': '.$value.'<br />';
}
If you just want the keys:
foreach (array_keys($_POST) as $key)
{
echo $key;
}
Or...
foreach ($_POST as $key => $value)
{
echo $key;
}
If you want both keys and values:
foreach ($_POST as $key => $value)
{
echo $key, ': ', $value;
}
For just the keys:
$array = array_keys($_POST);
Output them with:
var_dump($array);
-or-
print_r($array);