WinCache Funktionen
PHP Manual

wincache_ucache_add

(PECL wincache >= 1.1.0)

wincache_ucache_add Adds a variable in user cache only if variable does not already exist in the cache

Beschreibung

bool wincache_ucache_add ( string $key , mixed $value [, int $ttl = 0 ] )
bool wincache_ucache_add ( array $values [, mixed $unused = NULL [, int $ttl = 0 ]] )

Adds a variable in user cache, only if this variable doesn't already exist in the cache. The added variable remains in the user cache unless its time to live expires or it is deleted by using wincache_ucache_delete() or wincache_ucache_clear() functions.

Parameter-Liste

key

Store the variable using this key name. If a variable with same key is already present the function will fail and return FALSE. key is case sensitive. To override the value even if key is present use wincache_ucache_set() function instad. key can also take array of name => value pairs where names will be used as keys. This can be used to add multiple values in the cache in one operation, thus avoiding race condition.

value

Value of a variable to store. Value supports all data types except resources, such as file handles. This paramter is ignored if first argument is an array. A general guidance is to pass NULL as value while using array as key. If value is an object, or an array containing objects, then the objects will be serialized. See __sleep() for details on serializing objects.

values

Associative array of keys and values.

ttl

Time for the variable to live in the cache in seconds. After the value specified in ttl has passed the stored variable will be deleted from the cache. This parameter takes a default value of 0 which means the variable will stay in the cache unless explicitly deleted by using wincache_ucache_delete() or wincache_ucache_clear() functions.

Rückgabewerte

If key is string, the function returns TRUE on success and FALSE on failure.

If key is an array, the function returns:

Beispiele

Beispiel #1 wincache_ucache_add() with key as a string

<?php
$bar 
'BAR';
var_dump(wincache_ucache_add('foo'$bar));
var_dump(wincache_ucache_add('foo'$bar));
var_dump(wincache_ucache_get('foo'));
?>

Das oben gezeigte Beispiel erzeugt folgende Ausgabe:

bool(true)
bool(false)
string(3) "BAR" 

Beispiel #2 wincache_ucache_add() with key as an array

<?php
$colors_array 
= array('green' => '5''Blue' => '6''yellow' => '7''cyan' => '8');
var_dump(wincache_ucache_add($colors_array));
var_dump(wincache_ucache_add($colors_array));
var_dump(wincache_ucache_get('Blue'));
?>

Das oben gezeigte Beispiel erzeugt folgende Ausgabe:

array(0) { } 
array(4) { 
  ["green"]=> int(-1) 
  ["Blue"]=> int(-1) 
  ["yellow"]=> int(-1) 
  ["cyan"]=> int(-1) 
} 
string(1) "6"

Siehe auch


WinCache Funktionen
PHP Manual