(PECL wincache >= 1.1.0)
wincache_ucache_add — Adds a variable in user cache only if variable does not already exist in the cache
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.
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.
valuesAssociative 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.
If key is string, the function returns true on success and false on failure.
If key is an array, the function returns:
false;
Example #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'));
?>
以上例程会输出：
bool(true) bool(false) string(3) "BAR"
Example #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'));
?>
以上例程会输出：
array(0) { }
array(4) {
["green"]=> int(-1)
["Blue"]=> int(-1)
["yellow"]=> int(-1)
["cyan"]=> int(-1)
}
string(1) "6"