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: ''
implode
(PHP 4, PHP 5, PHP 7)
implode — 문자열로 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.
glue를 implode()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.
add a note
User Contributed Notes 14 notes
houston_roadrunner at yahoo dot com ¶
15 years ago
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
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! ;)
Felix Rauch ¶
8 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('; ', $array);
?>
will output:
foo; bar; qux
alexey dot klimko at gmail dot com ¶
13 years ago
If you want to implode an array of booleans, you will get a strange result:
<?php
var_dump(implode('',array(true, true, false, false, true)));
?>
Output:
string(3) "111"
TRUE became "1", FALSE became nothing.
Honk der Hase ¶
4 years ago
If you want to implode an array as key-value pairs, this method comes in handy.
The third parameter is the symbol to be used between key and value.
<?php
function mapped_implode($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
?>
biziclop ¶
3 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>
*/
?>
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.
masterandujar ¶
12 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.
Anonymous ¶
9 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
?>
Rafael Pereira ¶
4 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);
}
admin at lanlink dot net dot au ¶
7 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"
?>
info AT sinistercircuits DOT com ¶
3 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.
info at ensostudio dot ru ¶
4 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);
?>
