apcu_dec

(PECL apcu >= 4.0.0)

apcu_dec — Decrease a stored number

说明

int apcu_dec ( string $key [, int $step = 1 [, bool &$success ]] )

Decreases a stored integer value.

参数

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.

返回值

Returns the current value of key's value on success, 或者在失败时返回 FALSE

范例

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 );
 ?>

以上例程的输出类似于：

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

参见

apcu_inc() - Increase a stored number