Php Key Generation And Authentication Class Nulled
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(PHP 4, PHP 5, PHP 7)
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key — Obtiene una clave de un array
Descripción
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key() devuelve el elemento índice de la posición actual del array.
Parámetros
arrayEl array.
Valores devueltos
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.
Ejemplos
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);
}
?>Ver también
- current() - Devuelve el elemento actual en un array
- next() - Avanza el puntero interno de un 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($array);
}
//this will work properly
?>
Php Key Generation And Authentication Class Nulled Login
Needed to get the index of the max/highest value in an assoc array.
max() only returned the value, no index, so I did this instead.
<?php
reset($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);
}Php Key Generation And Authentication Class Nulled 2
¶Php Key Generation And Authentication Class Nulled 1
Php Key Generation And Authentication Class Nulled 3
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);
?>Php Key Generation And Authentication Class Nulled 2017
- Funciones de Arrays
- Deprecated