CODEWITHSUNDEEP
phparraysquery-stringassociative-arrayimplode
matpie
matpie

Reputation: 17512

Fastest way to implode an associative array with keys

I'm looking for a fast way to turn an associative array in to a string. Typical structure would be like a URL query string but with customizable separators so I can use '&' for xhtml links or '&' otherwise.

My first inclination is to use foreach but since my method could be called many times in one request I fear it might be too slow.

<?php
$Amp = $IsXhtml ? '&amp;' : '&';
$Parameters = array('Action' => 'ShowList', 'Page' => '2');
$QueryString = '';
foreach ($Parameters as $Key => $Value)
        $QueryString .= $Amp . $Key . '=' . $Value;

Is there a faster way?

Upvotes: 137

Views: 216939

Answers (11)

fekiri malek
fekiri malek

Reputation: 376

I liked the approach of @kostikovmu as it looks simpler than other long codes. though this is not exactly what we are after.. We look for this header format : "...key: value\r\n...".

So i used extended the fomula to get that

urldecode(str_replace("=", ": ", http_build_query($headers,"", "\r\n")))

Upvotes: 0

Unicco
Unicco

Reputation: 2580

Use array_walk for this.

$arr = [
    "key"  => "value",
    "key2" => "value2",
];

array_walk($arr, function(&$value, $key) {
    $value = "{$key}: {$value}";
});

implode("<br/>", $arr)

Result

key: value<br/>key2: value2<br/>

Upvotes: 1

kostikovmu
kostikovmu

Reputation: 699

My solution:

$url_string = http_build_query($your_arr);
$res = urldecode($url_string);

Upvotes: 10

FantomX1
FantomX1

Reputation: 1711

What about this shorter, more transparent, yet more intuitive with array_walk

$attributes = array(
  'data-href'   => 'http://example.com',
  'data-width'  => '300',
  'data-height' => '250',
  'data-type'   => 'cover',
);

$args = "";
array_walk(
    $attributes, 
    function ($item, $key) use (&$args) {
        $args .= $key ." = '" . $item . "' ";  
    }
);
// output: 'data-href="http://example.com" data-width="300" data-height="250" data-type="cover"

Upvotes: 3

WackGet
WackGet

Reputation: 2926

A one-liner for creating string of HTML attributes (with quotes) from a simple array:

$attrString = str_replace("+", " ", str_replace("&", "\" ", str_replace("=", "=\"", http_build_query($attrArray)))) . "\"";

Example:

$attrArray = array("id"    => "email", 
                   "name"  => "email",
                   "type"  => "email",
                   "class" => "active large");

echo str_replace("+", " ", str_replace("&", "\" ", str_replace("=", "=\"", http_build_query($attrArray)))) . "\"";

// Output:
// id="email" name="email" type="email" class="active large"

Upvotes: 2

Softmixt
Softmixt

Reputation: 1756

function array_to_attributes ( $array_attributes )
{

    $attributes_str = NULL;
    foreach ( $array_attributes as $attribute => $value )
    {

        $attributes_str .= " $attribute=\"$value\" ";

    }

    return $attributes_str;
}

$attributes = array(
    'data-href'   => 'http://example.com',
    'data-width'  => '300',
    'data-height' => '250',
    'data-type'   => 'cover',
);

echo array_to_attributes($attributes) ;

Upvotes: 2

user4846194
user4846194

Reputation: 241

This is my solution for example for an div data-attributes:

<?

$attributes = array(
    'data-href'   => 'http://example.com',
    'data-width'  => '300',
    'data-height' => '250',
    'data-type'   => 'cover',
);

$dataAttributes = array_map(function($value, $key) {
    return $key.'="'.$value.'"';
}, array_values($attributes), array_keys($attributes));

$dataAttributes = implode(' ', $dataAttributes);

?>

<div class="image-box" <?= $dataAttributes; ?> >
    <img src="http://example.com/images/best-of.jpg" alt="">
</div>

Upvotes: 24

scunliffe
scunliffe

Reputation: 63588

If you're not concerned about the exact formatting however you do want something simple but without the line breaks of print_r you can also use json_encode($value) for a quick and simple formatted output. (note it works well on other data types too)

$str = json_encode($arr);
//output...
[{"id":"123","name":"Ice"},{"id":"234","name":"Cake"},{"id":"345","name":"Pie"}]

Upvotes: 46

dino.keco
dino.keco

Reputation: 1401

One way is using print_r(array, true) and it will return string representation of array

Upvotes: 21

Greg
Greg

Reputation: 321688

You can use http_build_query() to do that.

Generates a URL-encoded query string from the associative (or indexed) array provided.

Upvotes: 189

Adam
Adam

Reputation:

As an aside, I was in search to find the best way to implode an associative array but using my own seperators etc...

So I did this using PHP's array_walk() function to let me join an associative array into a list of parameters that could then be applied to a HTML tag....

// Create Params Array
$p = Array("id"=>"blar","class"=>"myclass","onclick"=>"myJavascriptFunc()");

// Join Params
array_walk($p, create_function('&$i,$k','$i=" $k=\"$i\"";'));
$p_string = implode($p,"");

// Now use $p_string for your html tag

Obviously, you could stick that in your own function somehow but it gives you an idea of how you can join an associative array using your own method. Hope that helps someone :)

Upvotes: 36

Related Questions