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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
Description
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.
Parameters
-
key
-
Store the variable using this
key
name. If a variable with same key is already present the function will fail and returnFALSE
.key
is case sensitive. To override the value even ifkey
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 passNULL
asvalue
while using array askey
. Ifvalue
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.
Return Values
If key
is string, the function returns TRUE
on success and FALSE
on failure.
If key
is an array, the function returns:
- If all the name => value pairs in the array can be set, function returns an empty array;
-
If all the name => value pairs in the array cannot be set, function returns
FALSE
; - If some can be set while others cannot, function returns an array with name=>value pair for which the addition failed in the user cache.
Examples
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'));
?>
The above example will output:
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'));
?>
The above example will output:
array(0) { } array(4) { ["green"]=> int(-1) ["Blue"]=> int(-1) ["yellow"]=> int(-1) ["cyan"]=> int(-1) } string(1) "6"
See Also
- wincache_ucache_set() - Adds a variable in user cache and overwrites a variable if it already exists in the cache
- wincache_ucache_get() - Gets a variable stored in the user cache
- wincache_ucache_delete() - Deletes variables from the user cache
- wincache_ucache_clear() - Deletes entire content of the user cache
- wincache_ucache_exists() - Checks if a variable exists in the user cache
- wincache_ucache_meminfo() - Retrieves information about user cache memory usage
- wincache_ucache_info() - Retrieves information about data stored in the user cache
- __sleep()
English translation
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Document created the 30/01/2003, last modified the 26/10/2018
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References
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