How to add element in this Array?

Try this :

$men = array(
    array('name'=>'NO.1', 'age' => 11),
    array('name'=>'NO.2', 'age' => 22),
    array('name'=>'NO.3', 'age' => 33),
);

$result = array();

foreach($men as $key=>$value){
    $thisMen = $men[$key];
    $thisMen['gender'] = 'M';
    $result[] = $thisMen;
}

var_dump($result);

You could also avoid the extra $thisMen variable by doing something like

for($i=0;$i<count($men);$i++){
    $result[] = $men[$i];
    $result[$i]["gender"] = 'M';
}

Or, just reference the original array values and change them, as follows

foreach($men as &$thisMen)
    $thisMen["gender"] = 'M';

Shai.

You could do:

$newArray = array();
foreach($men as $value){
    $result[] = $value;
    $result['gender'] = 'M';
    $newArray[] = $result;
}
$men = $newArray;
unset($newArray);

<?php
    $men = array(
        array('name'=>'NO.1', 'age' => 11),
        array('name'=>'NO.2', 'age' => 22),
        array('name'=>'NO.3', 'age' => 33),
    );

    $result = array();

    echo '<pre>';

    foreach($men as $value){
        $result[] = array_merge($value, array('gender' => 'M'));
    }
    unset($arr1);
    var_dump($result);
?>

Instead of

foreach($men as $value){
  $result[] = $value;
  $result[]['gender'] = 'M';
}

use

foreach($men as $value){
  $value['gender'] ='M';
  array_push($result, $value);
}

This will loop through each inner arrays, add the gender field to each of them and push them to the $result array.

With this method, the original $men array remains unchanged.

However, if you wish to change the original array as well, you can add an ampersand (&) just before the $value on the foreach loop which will use a reference to the inner arrays over creating a copy. This can be done as follows.

foreach($men as &$value){
  $value['gender'] ='M';
  array_push($result, $value);
}