wincache_ucache_set

    (PECL wincache >= 1.1.0)

    wincache_ucache_set — 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 key name. If a variable with same key is already present the function will overwrite the previous value with the new one. key is case sensitive. 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.

    返回值

    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.

    示例

    示例 #1 wincache_ucache_set() with key as 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'));
    ?>

    以上示例会输出：

    bool(true)
string(3) "BAR"
bool(true)
string(3) "BAR1"

    示例 #2 wincache_ucache_set() with key as 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'));
    ?>

    以上示例会输出：

    array(0) {}
array(0) {}
string(1) "6"

    参见

    改进此页面

    了解如何改进此页面 • 提交拉取请求 • 报告一个错误
    ＋添加备注

    用户贡献的备注 1 note

    up
    0
    don dot raman at microsoft dot com
    14 years ago
    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
    ＋添加备注
    To Top