implode

(PHP 4, PHP 5)

implodeUnisce gli elementi di una matrice in una stringa

Descrizione

string implode ( string $glue , array $pieces )

Restituisce una stringa contenente tutti gli elementi di una matrice nel medesimo ordine, inserendo il parametro glue tra un elemento e l'altro.

Example #1 Esempio di uso di implode()

<?php

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

echo 
$comma_separated// lastname,email,phone

?>

Nota:

La funzione implode(), per ragioni storiche, può accettare i propri parametri in entrambi gli ordini. Tuttavia per mantenere la consistenza con explode(), ed avere meno confusione, utilizzare i parametri nell'ordine documentato.

Nota:

Dal PHP 4.3.0, il parametro glue di implode() è opzionale e come default utilizza una stringa vuota (''). Questo non è l'utilizzo preferenziale di implode(). Si suggerisce di utilizzare sempre il secondo parametro per compatibilità con le vecchie versioni.

Nota: Questa funzione è binary-safe (gestisce correttamente i file binari)

Vedere anche explode() e split().

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User Contributed Notes 8 notes

up
78
houston_roadrunner at yahoo dot com
5 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
20
omar dot ajoue at kekanto dot com
1 year 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
5
Jacques Amar
3 months ago
Safe way to pass as parameters in IN

<?php
$id_nums
= array(1,6,12,18,24);
$p_types = '';
$qs    = array();
foreach (
$id_nums as $id) {
   
$qs[]   = '?';
   
$p_types .= 'i'; // or whatever type
}
$nums_list = implode(',', $qs);
            
$sqlquery = "Select name,email,phone from usertable where user_id IN ($nums_list)";

$stmt = $dbh->stmt_init();
$stmt->prepare($sqlquery);
// later on, instead of bind:
$parms_array = array_merge(array($p_types), $id_nums);
call_user_func_array(array($stmt,'bind_param'), $parms_array );

// $sqlquery becomes "Select name,email,phone from usertable where user_id IN (?,?,?,?,?)"
?>
up
13
alexey dot klimko at gmail dot com
3 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
20
php.net {at} nr78 {dot} net
9 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
8
Anonymous
1 year 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
1
masterandujar
1 year 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
0
cottton at i-stats dot net
2 months ago
in case you want to implode by keys:
<?php
const POSITION_KEY = 0;
const
POSITION_VAL = 2;
const
POSITION_DESC = 1;

$key = 'key';
$val = 'val';
$desc = 'desc';

$arr = array(
   
POSITION_KEY => $key,
   
POSITION_VAL => $val,
   
POSITION_DESC => $desc,
);
echo
kimplode('=',$arr); // key=desc=val
echo '<br>';
echo
krimplode('=',$arr); // val=desc=key

function kimplode($glue,$arr){
   
ksort($arr);
    return
implode($glue,$arr);
}
function
krimplode($glue,$arr){
   
krsort($arr);
    return
implode($glue,$arr);
}
?>
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