wincache_ucache_set()
(PECL wincache >= 1.1.0)
Adds a variable in user cache and overwrites a variable if it already exists in the cache
说明
wincache_ucache_set(mixed $key, mixed $value[,int $ttl= 0]): bool
wincache_ucache_set(array $values[,mixed $unused= NULL[,int $ttl= 0]]): bool
Adds a variable in user cache. Overwrites a variable if it already exists in the cache. The added or updated 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.
参数
- $key
Store the variable using this$keyname. If a variable with same$keyis already present the function will overwrite the previous value with the new one.$keyis case sensitive.$keycan 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.
- $value
Value of a variable to store.$Valuesupports 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$valuewhile using array as$key. If$valueis 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.
- $ttl
Time for the variable to live in the cache in seconds. After the value specified in$ttlhas passed the stored variable will be deleted from the cache. This parameter takes a default value of0which means the variable will stay in the cache unless explicitly deleted by using wincache_ucache_delete() or wincache_ucache_clear() functions.
返回值
If$keyis string, the function returns TRUE
on success and FALSE
on failure.
If$keyis 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 pair for which the addition failed in the user cache.
范例
Example #1 wincache_ucache_set() with$keyas a string
<?php $bar = 'BAR'; var_dump(wincache_ucache_set('foo', $bar)); var_dump(wincache_ucache_get('foo')); $bar1 = 'BAR1'; var_dump(wincache_ucache_set('foo', $bar1)); var_dump(wincache_ucache_get('foo')); ?>
以上例程会输出:
bool(true) string(3) "BAR" bool(true) string(3) "BAR1"
Example #2 wincache_ucache_set() with$keyas an array
<?php $colors_array = array('green' => '5', 'Blue' => '6', 'yellow' => '7', 'cyan' => '8'); var_dump(wincache_ucache_set($colors_array)); var_dump(wincache_ucache_set($colors_array)); var_dump(wincache_ucache_get('Blue')); ?>
以上例程会输出:
array(0) {} array(0) {} string(1) "6"
参见
wincache_ucache_add()
Adds a variable in user cache only if variable does not already exist in the cachewincache_ucache_get()
Gets a variable stored in the user cachewincache_ucache_delete()
Deletes variables from the user cachewincache_ucache_clear()
Deletes entire content of the user cachewincache_ucache_exists()
Checks if a variable exists in the user cachewincache_ucache_meminfo()
Retrieves information about user cache memory usagewincache_ucache_info()
Retrieves information about data stored in the user cache- __sleep()
As of writing this note (PHP 5.3.1) serialization of closure is not allowed. This means a code like the one below: <?php //Closure $bar3 = function($a) { return $a * 2; }; wincache_ucache_set('foo3', $bar3); var_dump(wincache_ucache_get('foo3')); echo "<br>"; ?> Will throw exception: [11-Feb-2010 09:25:33] PHP Fatal error: Uncaught exception 'Exception' with message 'Serialization of 'Closure' is not allowed' in C:\inetpub\wwwroot\phptest\tests\ucache\wincache15.php:6 Stack trace: #0 C:\inetpub\wwwroot\phptest\tests\ucache\wincache15.php(6): wincache_ucache_set('foo3', Object(Closure)) #1 {main} thrown in C:\inetpub\wwwroot\phptest\tests\ucache\wincache15.php on line 6 However one catch this exception like: <?php //Closure $bar3 = function($a) { return $a * 2; }; try { wincache_ucache_set('foo3', $bar3); } catch (Exception $e) { var_dump($e->getMessage()); } var_dump(wincache_ucache_get('foo3')); echo "<br>"; ?> This will generate output as shown beloe: string(41) "Serialization of 'Closure' is not allowed" NULL