Print the Keys of an Array

Print the keys of an array

You can use PHP's array_keys function to grab the keys, like so:

foreach(array_keys($parameters) as $paramName)
  echo $paramName . "<br>";

Or, you can run through the array using a special foreach which allows you to separate the key and value for every element, like so:

foreach($parameters as $paramName => $value)
  echo $paramName . "<br>";

Also, make sure that you are using a "string" (with quotes) or integer (like 1337) as your key, like so:

$parameters["day"] = 1;
$parameters["month"] = 8;
$parameters["year"] = 2010;

OR if you want to get fancier:

$parameters = array(
  "day" => 1,
  "month" => 8,
  "year" => 2010
);

Your code should look like:

$parameters = array(
  "day" => 1,
  "month" => 8,
  "year" => 2010
);
foreach($parameters as $paramName => $paramValue)
  echo $paramName . "<br>";

How to print array element with keys & values in PHP?

In the nested foreach you have to iterate over the $value which holds the array.

foreach ( $marks as $key => $value) {
   foreach ( $value as $key2 => $value2 ) {
   // -------^^^^^^-------
      echo $key . " : " . $key2 . " - " . $value2 . "<br>";
   }
};

How to print key and value of an array of objects

Try something like this:

const array = [{
  key: '1',
  value: 'value-1'
}, {
  key: '2',
  value: 'value-2'
}];
const text = array.map(x => `<span class="${x.key}">${x.value}</span><br>`).join("");
const element = document.querySelector('#log');
element.innerHTML = text;

<div id="log"></div>

PHP: How do I print the key from array only once and every value for each item?

So, I suppose, your data looks kind of like this?

$result = (object)[];

$result->devices = [
    ['deviceId' => 1, 'description' => 'desc1', 'status' => 'status14'],
    ['deviceId' => 2, 'description' => 'desc2', 'status' => 'status15'],
    ['deviceId' => 3, 'description' => 'desc3', 'status' => 'status16'],
    ['deviceId' => 4, 'description' => 'desc2', 'status' => 'status17'],
];

Then to create a CSV file from it I would go like this:

$fp = fopen('csv.csv', 'w+');

foreach($result->devices as $i => $device)
{
    // First row? Write headers (keys) first!
    if($i == 0) fputcsv($fp, array_keys($device)); 

    // Write data rows
    fputcsv($fp, array_values($device));
}
fclose($fp);

This way, you will get this:

deviceID,description,status
1,desc1,status14
2,desc2,status15
3,desc3,status16
4,desc4,status17

Is this what you need?

Print with key and value from array of objects

Given the array you have, you simply need to loop through it:

var arr = [

  {"id":1,"name":"admin","password":"admin","role":"Admin"},

  {"id":2,"name":"user","password":"user","role":"User"},

  {"id":3,"name":"superadmin","password":"superadmin","role":"superadmin"}

]

arr.forEach(function(obj) {

  console.log('name: ' + obj.name);

  console.log('password: ' + obj.password);

})

in twig how to print out keys and values of an array

Your filters variable is an array of arrays, so you need to do something like:

{% for filter in filters %}
    {% for key, value in filter %}
        {{ key }} : {{ value }}
    {% endfor %}
{% endfor %}

How to print out the keys of an array like $_POST in PHP?

var_dump($_POST);

or

print_r($_POST);

You might insert a pre tag before and after for the clearer output in your browser:

echo '<pre>';
var_dump($_POST);
echo '</pre>';

And I suggest to use Xdebug. It provides an enchanted var_dump that works without pre's as well.

Bash - to print keys and values from a variable

test is a normal variable and doesn't store any reference to the array. In your case writing $!test is the same as writing ${someUndefinedVariable}test (see ✱). The undefined variable will expand to the empty string. test is a literal string.

To print the keys and values, you have to iterate over the keys and retrieve the corresponding values manually:

declare -A array
array[a1]=123
array[b1]=456
for key in "${!array[@]}"; do
    echo "key=$key, value=${array[$key]}"
done

By the way, I'm suprised your command even ran without an error; a closing " is missing. You cannot nest quotation marks. After the first " the second " will end quotation:

|quoted|       |quoted   |started quote without end -->
|      |       |     |   |
"Hello "$!test "$test" Hi"
       |       |     |   | 
       |unquoted     |unquoted

✱ $! is actually a special variable that contains the process number of the last background command. Since you did not start any background commands in your session $! is empty.

Print array key without value

You can get the size key like this:

for(let i=0; i<elements.length;i++)
{
    console.log("***" + elements[i].name + "***");
    console.log(Object.keys(elements)[4] + ":" + elements[i].size);
}

But this will work when the size key is always on the 4th index as it is in your elements object

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