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(PHP 4, PHP 5, PHP 7)
key — Obtiene una clave de un array
key() devuelve el elemento índice de la posición actual del array.
array
El array.
La función key() simplemente devuelve la clave del elemento del array que está apuntando actualmente el puntero interno. No desplaza el puntero de ninguna manera. Si el puntero interno señala más allá del final de la lista de elementos o el array está vacío, key() devuelve NULL
.
Ejemplo #1 Ejemplo de key()
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<?php
$array = array(
'fruta1' => 'manzana',
'fruta2' => 'naranja',
'fruta3' => 'uva',
'fruta4' => 'manzana',
'fruta5' => 'manzana');
// Este ciclo muestra todas las claves del array asociativo
// donde el valor equivale a 'manzana'
while ($nombre_fruta = current($array)) {
if ($nombre_fruta 'manzana') {
echo key($array).'<br />';
}
next($array);
}
?>
Note that using key($array) in a foreach loop may have unexpected results.
When requiring the key inside a foreach loop, you should use:
foreach($array as $key => $value)
I was incorrectly using:
<?php
foreach($array as $value)
{
$mykey = key($array);
}
?>
and experiencing errors (the pointer of the array is already moved to the next item, so instead of getting the key for $value, you will get the key to the next value in the array)
CORRECT:
<?php
foreach($array as $key => $value)
{
$mykey = $key;
}
A noob error, but felt it might help someone else out there.
Suppose if the array values are in numbers and numbers contains `0` then the loop will be terminated. To overcome this you can user like this
<?php
$array = array(
'0' => '5',
'1' => '2',
'2' => '0',
'3' => '3',
'4' => '1');
// wrong approach
while ($fruit_name = current($array)) {
echo key($array).'<br />';
next($array);
}
// the way will be break loop when arra('2'=>0) because its value is '0', while(0) will terminate the loop
// correct approach
while ( ($fruit_name = current($array)) ! FALSE ) {
echo key($array).'<br />';
next($array);
}
//this will work properly
?>
Needed to get the index of the max/highest value in an assoc array.
max() only returned the value, no index, so I did this instead.
<?php
reset($x); // optional.
arsort($x);
$key_of_max = key($x); // returns the index.
?>
(Editor note: Or just use the array_keys function)
Make as simple as possible but not simpler like this one :)
$k = array();
for($i = 0; $i < count($arr); $i++){
$k[$i] = key($arr);
next($arr);
}
In addition to FatBat's response, if you'd like to find out the highest key in an array (assoc or not) but don't want to arsort() it, take a look at this:
<?php
$arr = [ '3' => 14, '1' => 15, '4' => 92, '15' => 65 ];
$key_of_max = array_search( max($arr) , $arr);
?>
Working with OAuth and similar authentication protocols requires the use of temporary tokens which represent unique handshakes between multiple web services. These tokens must be unique, securely stored, and the longer, the better.
Since I've been out of the PHP game for a while, I was researching how to create such tokens without additional libraries. The following snippet does the trick:
If you aren't using PHP7 or above, you can fallback to the following:
Having the backing of OpenSSL for token generation gives confidence that the token will be unique. Of course you can also do a storage check to ensure the token isn't already in use, but if you use a length of 64 or larger, the chances you repeat a token are incredibly slim!