Display the drop-down list

Configuration of array_keys()

<?php
/**
 * PHP By Example
 *
 * @copyright 2014 Michel Corne 
 * @license   http://www.opensource.org/licenses/gpl-3.0.html GNU GPL v3
 */

require_once 'models/function_core.php';

/**
 * Function configuration
 *
 * @see docs/function-configuration.txt
 */

class array_keys extends function_core
{
    public 
$examples = [
        [
            [
                
0       => 100,
                
"color" => "red"
            
],
        ],
        [
            [
                
"blue",
                
"red",
                
"green",
                
"blue",
                
"blue"
            
],
            
"blue"
        
],
        [
            [
                
"color" => array("blue""red""green"),
                
"size"  => array("small""medium""large")
            ],
        ],
    ];

    public 
$synopsis 'array array_keys ( array $array [, mixed $search_value [, bool $strict = false ]] )';
}