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    implode

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

    implode — Une 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 add a note

    User Contributed Notes 14 notes

    up
    344
    houston_roadrunner at yahoo dot com
    15 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
    82
    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
    110
    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
    26
    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
    up
    42
    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.
    up
    8
    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

    ?>
    up
    2
    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>
    */

    ?>
    up
    19
    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
    15
    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.
    up
    3
    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
    ?>
    up
    -11
    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);
    }
    up
    -39
    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"
    ?>
    up
    -7
    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.
    up
    -18
    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);
    ?>
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