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implode

(PHP 4, PHP 5, PHP 7, PHP 8)

implodeUne elementos de un array en un string

Descripción

implode(string $separator, array $array): string

Firma alternativa (no se admite argumentos con nombre):

implode(array $array): string

Firma heredada (obsoleta a partir de PHP 7.4.0, eliminada a partir de PHP 8.0.0):

implode(array $array, string $separator): string

Une los elementos de un array con el string separator.

Parámetros

separator

Opcional. Por defecto es un string vacío.

array

El array de strings a ser usados por implode.

Valores devueltos

Devuelve un string que contiene la representación de todos los elementos del array en el mismo orden, con el string 'glue' entre cada elemento.

Historial de cambios

Versión Descripción
8.0.0 Pasar el parámetro separator después del array ya no es compatible.
7.4.0 Pasar el parámetro separator después del array (es decir, sin utilizar el orden documentado de los parámetros) es obsoleto.

Ejemplos

Ejemplo #1 Ejemplo de implode()

<?php

$array
= ['lastname', 'email', 'phone'];
var_dump(implode(",", $array)); // string(20) "lastname,email,phone"

// Devuelve un string vacío si se usa un array vacío:
var_dump(implode('hello', [])); // string(0) ""

// El separador es opcional:
var_dump(implode(['a', 'b', 'c'])); // string(3) "abc"

?>

Notas

Nota: Esta función es segura binariamente.

Ver también

add a note

User Contributed Notes 14 notes

up
352
houston_roadrunner at yahoo dot com
14 years ago
it should be noted that an array with one or no elements works fine. for example:

<?php
$a1
= array("1","2","3");
$a2 = array("a");
$a3 = array();

echo
"a1 is: '".implode("','",$a1)."'<br>";
echo
"a2 is: '".implode("','",$a2)."'<br>";
echo
"a3 is: '".implode("','",$a3)."'<br>";
?>

will produce:
===========
a1 is: '1','2','3'
a2 is: 'a'
a3 is: ''
up
88
ASchmidt at Anamera dot net
5 years ago
It's not obvious from the samples, if/how associative arrays are handled. The "implode" function acts on the array "values", disregarding any keys:

<?php
declare(strict_types=1);

$a = array( 'one','two','three' );
$b = array( '1st' => 'four', 'five', '3rd' => 'six' );

echo
implode( ',', $a ),'/', implode( ',', $b );
?>

outputs:
one,two,three/four,five,six
up
108
omar dot ajoue at kekanto dot com
11 years ago
Can also be used for building tags or complex lists, like the following:

<?php

$elements
= array('a', 'b', 'c');

echo
"<ul><li>" . implode("</li><li>", $elements) . "</li></ul>";

?>

This is just an example, you can create a lot more just finding the right glue! ;)
up
29
Felix Rauch
7 years ago
It might be worthwhile noting that the array supplied to implode() can contain objects, provided the objects implement the __toString() method.

Example:
<?php

class Foo
{
protected
$title;

public function
__construct($title)
{
$this->title = $title;
}

public function
__toString()
{
return
$this->title;
}
}

$array = [
new
Foo('foo'),
new
Foo('bar'),
new
Foo('qux')
];

echo
implode('; ', $array);
?>

will output:

foo; bar; qux
up
48
alexey dot klimko at gmail dot com
12 years ago
If you want to implode an array of booleans, you will get a strange result:
<?php
var_dump
(implode('',array(true, true, false, false, true)));
?>

Output:
string(3) "111"

TRUE became "1", FALSE became nothing.
up
5
biziclop
2 years ago
Sometimes it's necessary to add a string not just between the items, but before or after too, and proper handling of zero items is also needed.
In this case, simply prepending/appending the separator next to implode() is not enough, so I made this little helper function.

<?php

function wrap_implode( $array, $before = '', $after = '', $separator = '' ){
if( !
$array ) return '';
return
$before . implode("{$after}{$separator}{$before}", $array ) . $after;
}

echo
wrap_implode(['path','to','file.php'], '/');
// "/path/to/file.php"

$pattern = '#'. wrap_implode([4,2,2], '\d{', '}', '[-.]') .'#';
echo
$pattern, "\n"; // #\d{4}[-.]\d{2}[-.]\d{2}#
echo preg_replace( $pattern, '[REDACTED]', 'The UFO appeared between 2012-12-24 and 2013.01.06 every night.');
// 'The UFO appeared between [REDACTED] and [REDACTED] every night.

echo wrap_implode(['line','by','line'], '<b>', '</b>', '<br> ');
// <b>line</b><br> <b>by</b><br> <b>line</b>

echo wrap_implode( ['<a href="">Menu Item 1</a>', '<a href="">Menu Item 2</a>',],
"<li>", "</li>\n",
"<li> | </li>\n",
);
/*
<li><a href="">Link1</a></li>
<li> | </li>
<li><a href="">Link2</a></li>
*/

?>
up
8
Honk der Hase
3 years ago
If you want to implode an array as key-value pairs, this method comes in handy.
The third parameter is the symbol to be used between key and value.

<?php
function mapped_implode($glue, $array, $symbol = '=') {
return
implode($glue, array_map(
function(
$k, $v) use($symbol) {
return
$k . $symbol . $v;
},
array_keys($array),
array_values($array)
)
);
}

$arr = [
'x'=> 5,
'y'=> 7,
'z'=> 99,
'hello' => 'World',
7 => 'Foo',
];

echo
mapped_implode(', ', $arr, ' is ');

// output: x is 5, y is 7, z is 99, hello is World, 7 is Foo

?>
up
21
Anonymous
11 years ago
It may be worth noting that if you accidentally call implode on a string rather than an array, you do NOT get your string back, you get NULL:
<?php
var_dump
(implode(':', 'xxxxx'));
?>
returns
NULL

This threw me for a little while.
up
14
masterandujar
11 years ago
Even handier if you use the following:

<?php
$id_nums
= array(1,6,12,18,24);

$id_nums = implode(", ", $id_nums);

$sqlquery = "Select name,email,phone from usertable where user_id IN ($id_nums)";

// $sqlquery becomes "Select name,email,phone from usertable where user_id IN (1,6,12,18,24)"
?>

Be sure to escape/sanitize/use prepared statements if you get the ids from users.
up
7
Anonymous
8 years ago
null values are imploded too. You can use array_filter() to sort out null values.

<?php
$ar
= array("hello", null, "world");
print(
implode(',', $ar)); // hello,,world
print(implode(',', array_filter($ar, function($v){ return $v !== null; }))); // hello,world
?>
up
-13
Rafael Pereira
3 years ago
If you want to use a key inside array:

Example:
$arr=array(
array("id" => 1,"name" => "Test1"),
array("id" => 2,"name" => "Test2"),
);

echo implode_key(",",$arr, "name");
OUTPUT: Test1, Test2

function implode_key($glue, $arr, $key){
$arr2=array();
foreach($arr as $f){
if(!isset($f[$key])) continue;
$arr2[]=$f[$key];
}
return implode($glue, $arr2);
}
up
-37
admin at lanlink dot net dot au
6 years ago
It is possible for an array to have numeric values, as well as string values. Implode will convert all numeric array elements to strings.

<?php
$test
=implode(["one",2,3,"four",5.67]);
echo
$test;
//outputs: "one23four5.67"
?>
up
-9
info AT sinistercircuits DOT com
2 years ago
There is no mention of behavior on a empty array, so I tried it and here's the result:

<?php
$ar
= array();
$result = implode(',', $ar); // Comma arbitrarily applied as the separator
$is_result_empty = empty($result);
?>

$result:
$is_result_empty: 1

In other words, an empty string is the result.
up
-19
info at ensostudio dot ru
3 years ago
<?php
* Join pieces with a string recursively.
*
* @
param mixed $glue String between pairs(glue) or an array pair's glue and key/value glue or $pieces.
* @param iterable $pieces Pieces to implode (optional).
* @return string Joined string
*/
function double_implode($glue, iterable $pieces = null): string
{
$glue2 = null;
if ($pieces === null) {
$pieces = $glue;
$glue = '';
} elseif (is_array($glue)) {
list($glue, $glue2) = $glue;
}

$result = [];
foreach ($pieces as $key => $value) {
$result[] = $glue2 === null ? $value : $key . $glue2 . $value;
}
return implode($glue, $result);
}
?>
Examples:
<?php
$array = ['
a' => 1, 'b' => 2];
$str = implode($array);
$str = implode('
, ', $array);
$str = implode(['" ', '="'], $array);

$iterator = new ArrayIterator($array);
$str = implode($iterator);
$str = implode('
, ', $iterator);
$str = implode(['" ', '="'], $iterator);
?>
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