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PHP / apcu_cache_info — DevDocs

apcu_cache_info

(PECL apcu >= 4.0.0)

apcu_cache_info — Retrieves cached information from APCu's data store

Description 

apcu_cache_info(bool $limited = false): array|false

Retrieves cached information and meta-data from APC's data store.

Parameters

limited

If limited is true , the return value will exclude the individual list of cache entries. This is useful when trying to optimize calls for statistics gathering.

Return Values

Array of cached data (and meta-data) or false on failure

Note : apcu_cache_info() will raise a warning if it is unable to retrieve APC cache data. This typically occurs when APC is not enabled.

Changelog

Version Description
PECL apcu 3.0.11 The limited parameter was introduced.
PECL apcu 3.0.16 The " filehits " option for the cache_type parameter was introduced.

Examples

Example #1 A apcu_cache_info() example 

<?php
print_r(apcu_cache_info());
?>

The above example will output something similar to: 

Array
(
    [num_slots] => 2000
    [ttl] => 0
    [num_hits] => 9
    [num_misses] => 3
    [start_time] => 1123958803
    [cache_list] => Array
        (
            [0] => Array
                (
                    [filename] => /path/to/apcu_test.php
                    [device] => 29954
                    [inode] => 1130511
                    [type] => file
                    [num_hits] => 1
                    [mtime] => 1123960686
                    [creation_time] => 1123960696
                    [deletion_time] => 0
                    [access_time] => 1123962864
                    [ref_count] => 1
                    [mem_size] => 677
                )
            [1] => Array (...iterates for each cached file)
)

See Also

  • APCu configuration directives
  • APCUIterator::getTotalSize() - Get total cache size
  • APCUIterator::getTotalHits() - Get total cache hits
  • APCUIterator::getTotalCount() - Get total count
PHP / apcu_cas — DevDocs

apcu_cas

(PECL apcu >= 4.0.0)

apcu_cas — Updates an old value with a new value

Description 

apcu_cas(string $key, int $old, int $new): bool

apcu_cas() updates an already existing integer value if the old parameter matches the currently stored value with the value of the new parameter.

Parameters

key

The key of the value being updated.

old

The old value (the value currently stored).

new

The new value to update to.

Return Values

Returns true on success or false on failure.

Examples

Example #1 apcu_cas() example 

<?php
apcu_store('foobar', 2);
echo '$foobar = 2', PHP_EOL;
echo '$foobar == 1 ? 2 : 1 = ', (apcu_cas('foobar', 1, 2) ? 'ok' : 'fail'), PHP_EOL;
echo '$foobar == 2 ? 1 : 2 = ', (apcu_cas('foobar', 2, 1) ? 'ok' : 'fail'), PHP_EOL;

echo '$foobar = ', apcu_fetch('foobar'), PHP_EOL;

echo '$f__bar == 1 ? 2 : 1 = ', (apcu_cas('f__bar', 1, 2) ? 'ok' : 'fail'), PHP_EOL;

apcu_store('perfection', 'xyz');
echo '$perfection == 2 ? 1 : 2 = ', (apcu_cas('perfection', 2, 1) ? 'ok' : 'epic fail'), PHP_EOL;

echo '$foobar = ', apcu_fetch('foobar'), PHP_EOL;
?>

The above example will output something similar to: 

$foobar = 2
$foobar == 1 ? 2 : 1 = fail
$foobar == 2 ? 1 : 2 = ok
$foobar = 1
$f__bar == 1 ? 2 : 1 = fail
$perfection == 2 ? 1 : 2 = epic fail
$foobar = 1

See Also

  • apcu_dec() - Decrease a stored number
  • apcu_store() - Cache a variable in the data store
Read article
PHP / apcu_clear_cache — DevDocs

apcu_clear_cache

(PECL apcu >= 4.0.0)

apcu_clear_cache — Clears the APCu cache

Description 

apcu_clear_cache(): bool

Clears the cache.

Parameters

This function has no parameters.

Return Values

Returns true always

See Also

  • apcu_cache_info() - Retrieves cached information from APCu's data store
Read article
PHP / apcu_dec — DevDocs

apcu_dec

(PECL apcu >= 4.0.0)

apcu_dec — Decrease a stored number

Description 

apcu_dec(
 string $key,
 int $step = 1,
 bool &$success = ?,
 int $ttl = 0
): int|false

Decreases a stored integer value.

Parameters

key

The key of the value being decreased.

step

The step, or value to decrease.

success

Optionally pass the success or fail boolean value to this referenced variable.

ttl

TTL to use if the operation inserts a new value (rather than decrementing an existing one).

Return Values

Returns the current value of key 's value on success, or false on failure

Examples

Example #1 apcu_dec() example 

<?php
echo "Let's do something with success", PHP_EOL;

apcu_store('anumber', 42);

echo apcu_fetch('anumber'), PHP_EOL;

echo apcu_dec('anumber'), PHP_EOL;
echo apcu_dec('anumber', 10), PHP_EOL;
echo apcu_dec('anumber', 10, $success), PHP_EOL;

var_dump($success);

echo "Now, let's fail", PHP_EOL, PHP_EOL;

apcu_store('astring', 'foo');

$ret = apcu_dec('astring', 1, $fail);

var_dump($ret);
var_dump($fail);
?>

The above example will output something similar to: 

Let's do something with success
42
41
31
21
bool(true)
Now, let's fail

bool(false)
bool(false)

See Also

  • apcu_inc() - Increase a stored number
Read article
PHP / apcu_delete — DevDocs

apcu_delete

(PECL apcu >= 4.0.0)

apcu_delete — Removes a stored variable from the cache

Description 

apcu_delete(mixed $key): mixed

Removes a stored variable from the cache.

Parameters

key

A key used to store the value as a string for a single key, or as an array of strings for several keys, or as an APCUIterator object .

Return Values

If key is an array , an indexed array of the keys is returned. Otherwise true is returned on success, or false on failure.

Examples

Example #1 A apcu_delete() example 

<?php
$bar = 'BAR';
apcu_store('foo', $bar);
apcu_delete('foo');
// this is obviously useless in this form

// Alternatively delete multiple keys.
apcu_delete(['foo', 'bar', 'baz']);

// Or use an Iterator with a regular expression.
apcu_delete(new APCUIterator('#^myprefix_#'));
?>

See Also

  • apcu_store() - Cache a variable in the data store
  • apcu_fetch() - Fetch a stored variable from the cache
  • apcu_clear_cache() - Clears the APCu cache
  • APCUIterator
Read article
PHP / apcu_enabled — DevDocs

apcu_enabled

(PECL apcu >= 4.0.3)

apcu_enabled — Whether APCu is usable in the current environment

Description 

apcu_enabled(): bool

Returns whether APCu is usable in the current environment.

Parameters

This function has no parameters.

Return Values

Returns true when APCu is usable in the current environment, false otherwise.

Read article