implode

(PHP 4, PHP 5, PHP 7)

implode문자열로 배열 원소를 결합

설명

string implode ( string $glue , array $pieces )
string implode ( array $pieces )

배열 원소를 glue 문자열로 결합합니다.

Note:

implode()은 역사적인 이유로 인수를 다른 순서로 받아들입니다. 그러나 explode()와 일관성을 위하여, 문서에 나온 순서대로 인수를 사용해야 혼동이 적습니다.

인수

glue

기본 값은 빈 문자열입니다. glueimplode()의 두번째 인수로 사용하는 것은 추천되지 않으며, 나쁜 프로토타입을 사용하게 됩니다.

pieces

결합할 문자열을 가진 배열.

반환값

모든 배열 원소를 동일한 순서로, 각 원소의 문자열 표현 사이에 glue 문자열을 넣은 문자열을 반환합니다.

변경점

버전 설명
4.3.0 glue 인수가 선택적이 되었습니다.

예제

Example #1 implode() 예제

<?php

$array 
= array('lastname''email''phone');
$comma_separated implode(","$array);

echo 
$comma_separated// lastname,email,phone

?>

주의

Note: 이 함수는 바이너리 안전입니다.

참고

  • explode() - 문자열을 문자열로 나눕니다
  • split() - Split string into array by regular expression

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User Contributed Notes 10 notes

up
268
houston_roadrunner at yahoo dot com
10 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
9
ASchmidt at Anamera dot net
11 months 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
103
omar dot ajoue at kekanto dot com
6 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
16
Felix Rauch
3 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
68
php.net {at} nr78 {dot} net
14 years ago
Also quite handy in INSERT statements:

<?php

  
// array containing data
  
$array = array(
     
"name" => "John",
     
"surname" => "Doe",
     
"email" => "j.doe@intelligence.gov"
  
);

  
// build query...
  
$sql  = "INSERT INTO table";

  
// implode keys of $array...
  
$sql .= " (`".implode("`, `", array_keys($array))."`)";

  
// implode values of $array...
  
$sql .= " VALUES ('".implode("', '", $array)."') ";

  
// execute query...
  
$result = mysql_query($sql) or die(mysql_error());

?>
up
33
alexey dot klimko at gmail dot com
8 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
26
Anonymous
6 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
16
masterandujar
7 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
9
Anonymous
4 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
1
admin at lanlink dot net dot au
2 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"
?>
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